Bacterial neighbors can be fierce rivals in their daily scuffle for resources. Some Pseudomonas species use specialized microscopic membrane devices to fight back against competing bacteria.



According to new research, these <a href="https://www.earth.com/news/bacteria-strain-identified-that-can-eat-forever-chemicals/" target="_blank" rel="noreferrer noopener">cells</a> react to threats by assembling a precise injection tool inside their outer shell. 



This work comes from the lab of <a href="https://www.biozentrum.unibas.ch/about/administration/administration-a-z/overview/unit/research-group-marek-basler" target="_blank" rel="noreferrer noopener">Professor Marek Basler</a> at the Biozentrum, University of Basel.



<h2 class="wp-block-heading" id="h-why-tiny-spearguns-matter">Why tiny spearguns matter</h2>



These weapon-like structures are known as the type VI secretion system (<a href="https://asm.org/articles/2023/april/type-vi-secretion-systems-weapons-of-bacterial-des" target="_blank" rel="noreferrer noopener">T6SS</a>), and they allow bacteria to inject harmful molecules into rivals. They have been studied extensively because of their importance in bacterial <a href="https://www.earth.com/news/bacteria-and-imprint-new-era-dna-transformation/" target="_blank" rel="noreferrer noopener">competition</a> and survival.



“We knew that Pseudomonas aeruginosa uses its T6SS to fire back when attacked,” said Basler. Scientists had long <a href="https://pubmed.ncbi.nlm.nih.gov/18289922/" target="_blank" rel="noreferrer noopener">suspected</a> that external stress might activate these devices in <a href="https://my.clevelandclinic.org/health/diseases/25164-pseudomonas-infection" target="_blank" rel="noreferrer noopener">Pseudomonas aeruginosa</a>.&nbsp;



One survey showed that T6SS genes occur in about a quarter of <a href="https://www.ncbi.nlm.nih.gov/books/NBK538213/" target="_blank" rel="noreferrer noopener">gram-negative species</a>, highlighting their prevalence as a competitive strategy.



Some bacteria also direct T6SS at eukaryotic targets, affecting plant and animal hosts. This flexibility helps them adapt to diverse situations.



<h2 class="wp-block-heading" id="h-mechanical-force-as-a-trigger">Mechanical force as a trigger</h2>



“Using AFM, we have been able to mimic a bacterial T6SS attack,” said Yves F Dufrêne, a doctoral researcher at the <a href="https://pubmed.ncbi.nlm.nih.gov/17661630/" target="_blank" rel="noreferrer noopener">Swiss Nanoscience Institute</a>. The team used atomic force microscopy (<a href="https://www.nanoscience.com/techniques/atomic-force-microscopy/" target="_blank" rel="noreferrer noopener">AFM</a>) to gently push on the bacterial surface with a very fine tip. 



By applying measured force, they found that the <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC8934262/" target="_blank" rel="noreferrer noopener">outer membrane</a> damage alone could spur this injection tool into action. Once activated, the cells unleashed a burst of toxin-bearing elements to ward off intruders.



Studies from different labs have shown that surfaces with varied stiffness can influence <a href="https://www.earth.com/news/23-new-marine-bacteria-species-discovered-that-influence-global-ocean-cycles/" target="_blank" rel="noreferrer noopener">bacterial</a> attachment. However, it was less clear how direct mechanical stress might activate a defensive tool like T6SS.



Laboratories investigating <a href="https://www.sciencedirect.com/topics/food-science/vibrio" target="_blank" rel="noreferrer noopener">Vibrio species</a> observed T6SS responses to mechanical cues in marine environments. These clues paved the way for experiments focusing on Pseudomonas under controlled force measurements.



<h2 class="wp-block-heading" id="h-bacteria-detect-membrane-damage">Bacteria detect membrane damage</h2>



The scientists discovered that the site of membrane rupture guided the T6SS to assemble at the exact spot of assault. This high precision helps reduce wasted energy and ensures toxins only hit the intended target.



“Our work clearly shows that breaking the outer membrane is necessary and sufficient to trigger T6SS assembly,” said Basler. Researchers believe this system works thanks to a <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/phosphorylation-cascade" target="_blank" rel="noreferrer noopener">phosphorylation cascade</a> that springs into action upon sensing disruption. 



Pinpointing the exact trigger site allows minimal resource expenditure while maximizing impact on an aggressor. This specificity keeps the <a href="https://www.earth.com/news/bacteria-pass-down-memories-to-future-generations/" target="_blank" rel="noreferrer noopener">bacterial</a> cell from randomly launching costly attacks.



Scientists are interested in finding the molecular components that link physical membrane disturbance to T6SS initiation. These details could open doors for inhibitors designed to neutralize this response.



<h2 class="wp-block-heading" id="h-chemical-assault-on-the-membrane">Chemical assault on the membrane</h2>



Interestingly, certain antibiotics or <a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/peptide-derivative" target="_blank" rel="noreferrer noopener">peptide derivatives</a> also weaken the same barrier. This hints that chemical agents capable of penetrating the membrane can provoke a similar defensive strike.



The findings could be significant when considering <a href="https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/multiple-drug-resistance" target="_blank" rel="noreferrer noopener">multidrug resistance</a> in clinical settings. If a damaged outer membrane leads to a swift T6SS reaction, it might alter how pathogens respond to various medications.



<a href="https://www.sciencedirect.com/topics/medicine-and-dentistry/polymyxin-derivative" target="_blank" rel="noreferrer noopener">Polymyxin derivatives</a>, often reserved for severe infections, disrupt the outer membrane of Gram-negative bacteria. This disruption can unintentionally activate T6SS, giving the pathogen a countermeasure against rival organisms.



Understanding this dynamic may help clinicians refine how these drugs are applied in critical care. If T6SS ramps up under partial membrane stress, combination therapies might offer a more thorough strategy.



<h2 class="wp-block-heading" id="h-bacterial-response-to-membrane-damage">Bacterial response to membrane damage</h2>



Much still needs to be clarified, such as how multiple T6SS assemblies are precisely regulated once the membrane is compromised. Different strains may also vary in how sensitive they are to mechanical or chemical <a href="https://www.earth.com/news/bacteria-in-lake-mendota-keep-evolving-but-never-change/" target="_blank" rel="noreferrer noopener">cues</a>.



The bigger picture could involve a network of signals that prime bacteria to respond rapidly whenever their boundary is breached. Exploring these nuances might help researchers develop ways to disrupt this mechanism without harming beneficial microbes.



Researchers suspect that different bacterial species have unique thresholds for activating T6SS when threatened. This variation might determine which organisms thrive in complex environments like soil or aquatic habitats.



Experts are also investigating the role of protein partners that reset or limit T6SS after activation. Gaining clarity on the shutdown mechanism could lead to ways of blocking these assemblies and tackling antibiotic-resistant infections in the future.



The study is published in the journal <a href="https://www.science.org/doi/10.1126/sciadv.adr1713" target="_blank" rel="noreferrer noopener">Science Advances</a>.



-----



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Bacteria build tiny weapons when their membrane is damaged

Bacterial neighbors can be fierce rivals in their daily scuffle for resources. Some Pseudomonas species use specialized microscopic membrane devices to fight back against competing bacteria. According to new research, these cells react to threats by assembling a precise injection tool inside their outer shell. This work comes from the lab of Professor Marek Basler at the Biozentrum, University of Basel. Why tiny spearguns matter These weapon-like structures are known as the type VI secretion system (T6SS), and they allow bacteria to inject harmful molecules into rivals....

California Helping Utility Companies Install Thousands Of Car Charging Stations. California wants more drivers to dump the pump and plug in.
Climate change legislation signed Wednesday day by Gov. Jerry Brown calls for major utilities to compete as an alternative transportation fuel source by installing thousands of car charging stations where people live, work and play.
The provision was contained in a broader climate control measure requiring the state to boost renewable electricity use to 50 percent and double the energy efficiency of existing buildings by 2030.
The bill's author, Senate President Pro Tem Kevin de Leon, a <a href="http://www.earth.com/news/covid-19-may-have-arrived-in-los-angeles-last-year/">Los Angeles</a> Democrat, was forced to drop a key aspect of his proposal that would have pushed the state to cut oil use by half.
State officials hope to see a big cut in greenhouse gas emissions by encouraging residents to fuel their cars and trucks with electricity - a move that environmentalists say will pit utilities against oil companies in the marketplace. California Helping Utility Companies Install Thousands Of Car Charging Stations
"It basically tells the electric industry to go eat the oil industry's lunch," said Max Baumhefner, an attorney with the Natural Resources Defense Council.
While oil companies aggressively lobbied against the oil reduction provision in the bill, California's largest private utilities - Pacific Gas &amp; Electric, Southern California Edison and San Diego Gas &amp; Electric - were among those pushing to boost the electric vehicle charging market.
During the first half of the year, the three private utilities spent about $2 million lobbying state government on dozens of bills, including SB350. That was more than Chevron, Valero, Shell and BP combined in that same period, according to lobbying reports.
The oil companies did not oppose the goal of increasing electric power for cars but point out that the state has policies to diversify transportation fuels.
"We need to make sure Californians can move about our state and have access to reliable, affordable energy," said Catherine Reheis Boyd, president of the Western States Petroleum Association, which represents oil companies.
For utilities, the bill is a business opportunity as much as it is a moral imperative for the Democrats who want to fight climate change. Two of Brown's top aides, who negotiated the bill, are former PG&amp;E executives.
The state is already a leader in the electric vehicle market, according to the state's Plug-in Electric Vehicle Collaborative, with four of every 10 electric vehicles in the nation sold in <a href="https://www.bing.com/search?q=california&amp;cvid=ea6dd212320f460f9e94aa6dceaeb53f&amp;FORM=ANAB01&amp;PC=HCTS">California</a>. Still, they are only a fraction of the 1.7 million cars and light trucks sold in the state each year.
"Companies are going to have to prove to consumers that it's in their best interest to make that switch from traditional fuel vehicles," said Travis Miller, director of utilities research at Morningstar Inc. in Chicago. "I don't know we're at the tipping point quite yet."
One reason is the state's still-spotty charging infrastructure. Utilities plan to compete with private companies to install tens of thousands of new charging stations to diminish driver worries of getting stranded with a dead battery. The three utilities have separate plans before state regulators to spend more than $1 billion on charging stations.
Most electric car owners do their charging at home, so utilities are targeting chargers for multi-unit complexes, which can be challenging to break into, and businesses.
"The big opportunity is workplace. It's the other place where you really park your car for a long time," said Aaron Johnson, vice president of customer energy solutions at Pacific Gas &amp; Electric.
Consumer advocates are also watching the state Public Utilities Commission, which must approve plans to install the charging stations, to ensure ratepayers who will foot the bill for the charging stations do not overpay. The regulatory agency has come under fire for its cozy relationship with power company executives.
Betty Plowman of the Western States Trucking Association said while the state's policies are laudable, electric vehicles aren't yet practical for many commuters. She's also worried about having to subsidize electric car drivers through her utility bill.
"Who pays for that electricity? Is it a gift from the gods?" she said.
Electric car drivers and building owners will pay for the electricity, but all utility customers will pay for the chargers through their bills. Utilities estimate the hardware will add a nominal amount - 82 cents to $2 a year per San Diego Gas &amp; Electric customer, according to Laura McDonald, who directs clean transportation for SDG&amp;E. Critics such as Plowman said every penny counts for someone like her who is nearing retirement.
Computer consultant Darshan Brahmbhatt switched to a Nissan Leaf about two years ago. Brahmbhatt, who lives in Folsom, a suburb of Sacramento, estimates his lease and extra electricity costs are about $225 a month, less than the $300 he was paying for gas alone.
"It's kind of really worked out great," he said.
© 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.

California Helping Utility Companies Install Thousands Of Car Charging Stations

California Helping Utility Companies Install Thousands Of Car Charging Stations....

Quantifying The Direct Impact Of Climate Change Worldwide. UCLA-led study restores consensus after controversial 2014 paper questioned direct effects of climate change

An international research team led by UCLA life scientists has, for the first time, quantified the direct influence of climate on the growth of ecosystems around the globe.

The paper also restores scientific consensus to the fact that record-breaking temperatures and droughts directly affect ecosystems -- which was called into question by a 2014 University of Arizona paper in the journal Nature. Quantifying The Direct Impact Of Climate Change Worldwide

The new study, which was funded by the National Science Foundation, was published this week in the journal Global Change Biology.

The growth of whole ecosystems -- the accumulation of new growth in a forest, shrub land or grass land -- is referred to by scientists as net primary productivity. NPP is greater in the tropics than in the arctic because productivity responds directly to climate in much the same way that individual plants do. This means that the growth of ecosystems would respond rapidly to climate change. And because forests take up carbon dioxide from the atmosphere, even as their growth responds to climate, they play a role in determining ongoing climate change.

In challenging that point of view, the Arizona researchers found no correlation between NPP and climate, after accounting for the influence of forest mass and age. They concluded that the correlation of NPP with climate was a coincidence or an illusion that arose simply because larger forests tend to be located in warmer, moister climates, and because larger forests have faster growth.

But the UCLA-led study found definitively that NPP responds strongly and directly to climate. The implication of the new research is that climate change will have strong and immediate effects on forest productivity because climate strongly affects NPP, independent of the mass of the forest and its age.

"Our analysis shows that the direct influence of climate on NPP globally is undeniable and enormous," said Lawren Sack, a UCLA professor of ecology and evolutionary biology in the UCLA College and senior author of the research. "Our models can explain at least half of the global variation in NPP, with a major proportion attributable to climate, independently of biomass."

Sack said the fact that so much of ecosystems' productivity is tied to climate makes it clearer than ever that new and stronger policies to mitigate climate change are needed.

The researchers found major statistical flaws in the <a href="https://www.bing.com/search?q=arizona&amp;cvid=faac2654fe51459fa217af58f5077b74&amp;FORM=ANAB01&amp;PC=HCTS">Arizona</a> paper. For example, the UCLA-led team demonstrated that, because NPP is a measure of ecosystem growth, the Arizona researchers created a circular model by inputting the biomass and age of the ecosystems together in their model.

"In a statistical model, it's very important to ensure that there are no circularities -- that the model doesn't use terms that automatically explain the variable we want to predict," said <a href="http://www.earth.com/news/pandemic-will-alter-families-and-relationships-for-years-to-come/">UCLA</a> graduate student Megan Bartlett, a co-author of the new study. "If there are circularities, you lose the power to find the real influential variables. In this case, when we removed the circular influence of biomass and age, we could see the enormous influence of climate."

The UCLA-led team used multiple approaches to re-analyze the data from the Nature paper, with a focus on isolating the influence of climate from biomass in influencing NPP. They found that climate-related effects explained at least as much of the variation in NPP across forests worldwide as forest biomass.

"Everyone who has grown a plant understands how sensitive growth is to temperature and rainfall, but whether whole ecosystem growth responds in the same way had become controversial," Sack said. "It's obvious that ecosystems with more biomass have higher NPPs, in the same way that larger organisms grow faster than smaller organisms. Also, older ecosystems tend to grow slower than younger ones."

Yet Sack said the UCLA team was skeptical of the claims that the biomass and age of forests could explain global variation in NPP without accounting for climate, or that plants and ecosystems could compensate for different climates and maximize growth globally, as the Nature paper suggested.

"If that were true, the implication would be that climate change would have slower, or minimal, impacts on ecosystem growth worldwide," he said. "But this turns out not to be correct."

Sack said more research is needed to understand how each species and ecosystem responds to climate change, to learn more about the influence of other variables, such as soil fertility, and to make better predictions about the influence of climate on ecosystems.

"Our analyses have to keep improving if we are to have a chance to contribute to policies to anticipate, avert or mitigate the effects of changing climates and to guarantee a future not only for our species, but for entire ecosystems around our planet," Sack said. "Collaborations across scientific fields and among nations are becoming ever more critical."

---

<a href="http://www.ucla.edu" target="_blank" rel="noopener noreferrer">UCLA</a>

Quantifying The Direct Impact Of Climate Change Worldwide

Quantifying The Direct Impact Of Climate Change Worldwide. UCLA-led study...

Coral Bleaching Is Expanding Into The Caribbean. Bleaching intensifies in Hawaii, high ocean temperatures threaten Caribbean corals

As record ocean temperatures cause widespread coral bleaching across Hawaii, NOAA scientists confirm the same stressful conditions are expanding to the Caribbean and may last into the new year, prompting the declaration of the third global coral bleaching event ever on record.

Waters are warming in the Caribbean, threatening coral in Puerto Rico and the U.S. Virgin Islands, NOAA scientists said. Coral bleaching began in the Florida Keys and South Florida in August, but now scientists expect bleaching conditions there to diminish.

"The coral bleaching and disease, brought on by climate change and coupled with events like the current El Niño, are the largest and most pervasive threats to coral reefs around the world," said Mark Eakin, NOAA's Coral Reef Watch coordinator. "As a result, we are losing huge areas of coral across the U.S., as well as internationally. What really has us concerned is this event has been going on for more than a year and our preliminary model projections indicate it's likely to last well into 2016."

While corals can recover from mild bleaching, severe or long-term bleaching is often lethal. After corals die, reefs quickly degrade and the structures corals build erode. This provides less shoreline protection from storms and fewer habitats for fish and other marine life, including ecologically and economically important species.

This bleaching event, which began in the north <a href="https://www.bing.com/search?q=PACIFIC&amp;cvid=0cfe1390ce5a45c9b9ad1ef0593c64d8&amp;FORM=ANAB01&amp;PC=HCTS">Pacific</a> in summer 2014 and expanded to the south Pacific and Indian oceans in 2015, is hitting U.S. coral reefs disproportionately hard. NOAA estimates that by the end of 2015, almost 95 percent of U.S. coral reefs will have been exposed to ocean conditions that can cause corals to bleach.

The biggest risk right now is to the Hawaiian Islands, where bleaching is intensifying and is expected to continue for at least another month. Areas at risk in the Caribbean in coming weeks include Haiti, the Dominican Republic and Puerto Rico, and from the U.S. Virgin Islands south into the Leeward and Windward islands.

The next concern is the further impact of the strong El Niño, which climate models indicates will cause bleaching in the Indian and southeastern Pacific Oceans after the new year. This may cause bleaching to spread globally again in 2016.

"We need to act locally and think globally to address these bleaching events. Locally produced threats to coral, such as pollution from the land and unsustainable fishing practices, stress the health of corals and decrease the likelihood that corals can either resist bleaching, or recover from it," said Jennifer Koss, NOAA Coral Reef Conservation Program acting program manager. "To solve the long-term, global problem, however, we need to better understand how to reduce the unnatural carbon dioxide levels that are the major driver of the warming."

This announcement stems from the latest NOAA Coral Reef Watch satellite coral bleaching monitoring products, and was confirmed through reports from partner organizations with divers working on affected reefs, especially the XL Catlin Seaview Survey and ReefCheck. NOAA Coral Reef Watch's outlook, which forecasts the potential for coral bleaching worldwide several months in the future, predicted this global event in July 2015.

The current high ocean temperatures in Hawaii come on the heels of bleaching in the Main Hawaiian Islands in 2014?only the second bleaching occurrence in the region's history?and devastating bleaching and coral death in parts of the remote and well-protected Papahānaumokuākea Marine National Monument in the Northwestern Hawaiian Islands.

"Last year's bleaching at Lisianski Atoll was the worst our scientists have seen," said Randy Kosaki, NOAA's deputy superintendent for the monument. "Almost one and a half square miles of reef bleached last year and are now completely dead."

Coral bleaching occurs when corals are exposed to stressful environmental conditions such as high temperature. Corals expel the symbiotic algae living in their tissues, causing corals to turn white or pale. Without the algae, the coral loses its major source of food and is more susceptible to disease.

The first global bleaching event was in 1998, during a strong El Niño that was followed by an equally very strong La Niña. A second one occurred in 2010.

Satellite data from NOAA's Coral Reef Watch program provides current reef environmental conditions to quickly identify areas at risk for coral bleaching, while its climate model-based outlooks provide managers with information on potential bleaching months in advance.

The outlooks were developed jointly by NOAA's Satellite and Information Service and the National Centers for Environmental Prediction through funding from the Coral Reef Conservation Program and the Climate Program Office.

---

<a href="http://www.noaa.gov" target="_blank" rel="noopener noreferrer">NOAA</a>

Coral Bleaching Is Expanding Into The Caribbean

Coral Bleaching Is Expanding Into The Caribbean. Bleaching intensifies in...

California Oil Spill

Environmental Group Sues For Mandated Plans After Big Oil Spills. An environmental group sued the federal government Thursday, contending it gives pipeline owners and operators a free pass on developing legally required plans for dealing with big oil spills into lakes, rivers and other inland waterways.

The National Wildlife Federation lawsuit accuses the U.S. Department of Transportation of failing for 20 years to issue regulations on crafting the spill strategies and of allowing companies to operate without them. The plans were ordered under the <a href="http://www.earth.com/news/soil-pollution-is-a-source-of-antibiotic-resistance/">Oil Pollution</a> Act, which was enacted in 1990 following the Exxon Valdez disaster, and were supposed to be finished by 1995. Environmental Group Sues For Mandated Plans After Big Oil Spills

"The Department of Transportation's failure to review or approve spill response plans is a huge oversight that has left communities and wildlife vulnerable to catastrophic spills," said Neil Kagan, senior counsel for the federation.

The department's Pipeline and Hazardous Materials Safety Administration had no immediate comment. The U.S. Department of Justice said it would review the lawsuit but had no other comment.

The Department of Transportation last week proposed tightening safety rules for pipelines carrying crude oil and other hazardous liquids, including requiring operators to inspect lines in rural areas now exempt and to report problems with smaller, currently unregulated lines.

The wildlife federation, which filed suit in U.S. District Court in Detroit, said those steps don't address what happens after pipeline incidents occur. The Oil Pollution Act requires plans that make sure pipeline operators have enough resources available to remove as much oil as possible during a "worst case" spill and limit damage to public health and the environment, including fish, wildlife, shorelines and beaches.

But the department has yet to approve any such plans, the suit said. It asks the court to set a schedule for them to be submitted and reviewed, and to order the department to issue necessary regulations.

Pipelines carrying oil products or hazardous liquids cross inland waters at least 100 feet wide at 5,110 places nationwide, the suit said. It said the pipeline agency has identified 20 accidents at inland water crossings between 1991 and 2012. Two spills in recent years have sent more than 100,000 gallons of oil into the Yellowstone River. In Michigan, a ruptured pipeline in 2010 released 840,000 gallons into the Kalamazoo River and a creek.

The wildlife federation and other environmental groups also have warned of risks from twin pipelines running beneath the Straits of Mackinac, the nearly 5-mile-wide waterway linking Lakes Huron and Michigan. Enbridge Energy Partners LP, which operates the 62-year-old lines, has said they are inspected regularly and pose no threat.

"The oil pipeline industry's track record of spills, accidents and disasters underscores the need for iron-clad protections," said Mike Shriberg, executive director of the federation's Great Lakes Regional Center.

---

Follow John Flesher on Twitter at <a href="http://twitter.com/JohnFlesher" target="_blank" rel="noopener noreferrer">http://twitter.com/JohnFlesher</a>

© 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.

Environmental Group Sues For Mandated Plans After Big Oil Spills

Environmental Group Sues For Mandated Plans After Big Oil Spills....

Quantifying The Direct Impact Of Climate Change Worldwide. UCLA-led study restores consensus after controversial 2014 paper questioned direct effects of climate change

An international research team led by UCLA life scientists has, for the first time, quantified the direct influence of climate on the growth of ecosystems around the globe.

The paper also restores scientific consensus to the fact that record-breaking temperatures and droughts directly affect ecosystems -- which was called into question by a 2014 University of Arizona paper in the journal Nature. Quantifying The Direct Impact Of Climate Change Worldwide

The new study, which was funded by the National Science Foundation, was published this week in the journal Global Change Biology.

The growth of whole ecosystems -- the accumulation of new growth in a forest, shrub land or grass land -- is referred to by scientists as net primary productivity. NPP is greater in the tropics than in the arctic because productivity responds directly to climate in much the same way that individual plants do. This means that the growth of ecosystems would respond rapidly to climate change. And because forests take up carbon dioxide from the atmosphere, even as their growth responds to climate, they play a role in determining ongoing climate change.

In challenging that point of view, the Arizona researchers found no correlation between NPP and climate, after accounting for the influence of forest mass and age. They concluded that the correlation of NPP with climate was a coincidence or an illusion that arose simply because larger forests tend to be located in warmer, moister climates, and because larger forests have faster growth.

But the UCLA-led study found definitively that NPP responds strongly and directly to climate. The implication of the new research is that climate change will have strong and immediate effects on forest productivity because climate strongly affects NPP, independent of the mass of the forest and its age.

"Our analysis shows that the direct influence of climate on NPP globally is undeniable and enormous," said Lawren Sack, a UCLA professor of ecology and evolutionary biology in the <a href="http://www.earth.com/news/pandemic-will-alter-families-and-relationships-for-years-to-come/">UCLA</a> College and senior author of the research. "Our models can explain at least half of the global variation in NPP, with a major proportion attributable to climate, independently of biomass."

Sack said the fact that so much of ecosystems' productivity is tied to climate makes it clearer than ever that new and stronger policies to mitigate climate change are needed.

The researchers found major statistical flaws in the Arizona paper. For example, the UCLA-led team demonstrated that, because NPP is a measure of ecosystem growth, the Arizona researchers created a circular model by inputting the biomass and age of the ecosystems together in their model.

"In a statistical model, it's very important to ensure that there are no circularities -- that the model doesn't use terms that automatically explain the variable we want to predict," said UCLA graduate student Megan Bartlett, a co-author of the new study. "If there are circularities, you lose the power to find the real influential variables. In this case, when we removed the circular influence of biomass and age, we could see the enormous influence of climate."

The UCLA-led team used multiple approaches to re-analyze the data from the Nature paper, with a focus on isolating the influence of climate from biomass in influencing NPP. They found that climate-related effects explained at least as much of the variation in NPP across forests worldwide as forest biomass.

"Everyone who has grown a plant understands how sensitive growth is to temperature and rainfall, but whether whole ecosystem growth responds in the same way had become controversial," Sack said. "It's obvious that ecosystems with more biomass have higher NPPs, in the same way that larger organisms grow faster than smaller organisms. Also, older ecosystems tend to grow slower than younger ones."

Yet Sack said the UCLA team was skeptical of the claims that the biomass and age of forests could explain global variation in NPP without accounting for climate, or that plants and ecosystems could compensate for different climates and maximize growth globally, as the Nature paper suggested.

"If that were true, the implication would be that climate change would have slower, or minimal, impacts on ecosystem growth worldwide," he said. "But this turns out not to be correct."

Sack said more research is needed to understand how each species and ecosystem responds to climate change, to learn more about the influence of other variables, such as soil fertility, and to make better predictions about the influence of climate on ecosystems.

"Our analyses have to keep improving if we are to have a chance to contribute to policies to anticipate, avert or mitigate the effects of changing climates and to guarantee a future not only for our species, but for entire ecosystems around our planet," Sack said. "Collaborations across scientific fields and among nations are becoming ever more critical."

---

<a href="http://www.ucla.edu" target="_blank" rel="noopener noreferrer">UCLA</a>

Quantifying The Direct Impact Of Climate Change

Historic Rainfall Causing Drinking Water Problems In South Carolina. South Carolina's capital city had too much water. Now, officials are racing to make sure it has enough.
A canal that serves as the main source of drinking water for about half of the Columbia water system's 375,000 customers collapsed in two places following historic rainfall and flooding over the weekend, sending contractors scrambling to build a rock dam to plug the holes while<a href="https://www.bing.com/search?q=national+guard&amp;cvid=cc8098248afc41048f2c47af4de99316&amp;FORM=ANAB01&amp;PC=HCTS"> National Guard</a> helicopters dropped giant sandbags in the rushing water.
Water from the canal normally flows directly into the reservoir at the city's water treatment plant. But with the water level falling because of the levee breach, workers were forced to place orange pumps on the banks of the canal to pump water directly into the reservoir. And if that wasn't enough, the city had plans to pump water directly from the nearby <a href="http://www.earth.com/news/new-aquatic-mice-have-long-feet-to-wade-in-rivers-and-streams/">Broad River</a>. Historic Rainfall Causing Drinking Water Problems In South Carolina
Officials sought to beat back rampant rumors of an imminent water shortage.
"The system is running and it is running strong," Columbia Mayor Steve Benjamin told reporters.
Meanwhile, Gov. Nikki Haley issued a terse warning to thousands of people in low-lying areas near the coast to evacuate before a mass of water rumbling toward the ocean floods some places for up to two more weeks.
She asked people watching on television to call relatives who may have a false sense of security after surviving hurricanes, calling the second round of expected flooding "a different kind of bad." She said the standing water could last up to 12 days.
"We have thousands of people that won't move. And we need to get them to move," she said. "They don't need to be sitting in flooded areas for 12 days."
Back in Columbia, city officials urged residents to conserve water. And when they do use it, they have to boil it at least one minute. Restaurants are offering bottled water and serving meals on paper plates to avoid washing dishes. And many people often make daily trips to their local grocery stores to stock up on water.
"It's easy to conserve because you can't really use (the water)," said 26-year-old Laura Reinman, who was pushing a shopping cart with two gallon jugs of water at a Publix grocery store just across the street from the canal.
The city is like hundreds of others along the East Coast and in the Midwest that have been told to fix their aging infrastructure.
Columbia is under orders from the U.S. Environmental Protection Agency to fix its sewage treatment plant and sewer pipes to reduce overflows that can contaminate waterways. Those orders include spending $1 million on projects to reduce flooding along Gills Creek, one of the areas devastated by record rainfall and flooding.
And just last month, the state Supreme Court revived a lawsuit challenging how the city has paid for maintenance to its water and sewer systems, saying "simply put, the statutes do not allow these revenues to be treated as a slush fund."
Columbia separates its property tax collections, which are only imposed on city residents, from its water fees, which are paid by its customers who live throughout the region. In 1993, the city passed a resolution allowing it to pull money from the water fund to help balance the city's budget. According to the lawsuit, in the past three years, $12 million has been transferred form utility customers to pay for non-utility projects, such as economic development and efforts to lure businesses to the city.
Benjamin said the city has reduced the transfer over the past several years. This year, it was $2.8 million to help pay for police, fire and 911 services.
---
Associated Press reporters John Seewer contributed from Toledo, Ohio, and Meg Kinnard contributed from Blythewood, South Carolina.
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Historic Rainfall Causing Drinking Water Problems In South Carolina

Historic Rainfall Causing Drinking Water Problems In South Carolina. South...

Various

California To Phase Out Microbeads Used In Soap And Toothpastes. Gov. Jerry Brown signed legislation Thursday requiring California to phase out the use of microscopic exfoliating beads -- microbeads -- in personal care products sold in the state starting in 2020 to protect fish and wildlife.
The tiny plastic beads found in soap, toothpaste and body washes are so small that they are showing up in the bodies of <a href="https://www.bing.com/search?q=fish&amp;cvid=5b4f69ecab024bc4bc5cfb1ce90710d2&amp;FORM=ANAB01&amp;PC=HCTS">fish</a> and other wildlife after passing through water filtration systems without disintegrating.
Assemblyman Richard Bloom, D-<a href="http://www.earth.com/image/santa-ana-wind-event-over-california/">Santa Monica</a>, said his bill, AB888, seeks to drastically restrict all use of the non-biodegradable beads, which can contain various toxins.
"AB888 was carefully crafted to avoid any loopholes that would allow for use of potentially harmful substitutes," Bloom said in a statement Thursday. "This legislation ensures that personal care products will be formulated with environmentally-safe alternatives to protect our waterways and oceans."
A number of companies are replacing microbeads with natural substances such as ground-up fruit pits.
California lawmakers have attempted similar legislation before, but they met opposition from personal-care product companies. Amendments to the measure this year prompted many business critics to drop their opposition to California joining several other states in eliminating the so-called microbeads.
The microbead ban was one of several pieces of legislation Brown signed Thursday in response to concerns about environmental degredation. California To Phase Out Microbeads Used In Soap And Toothpastes
He approved SB185 by Senate President Pro Tem Kevin de Leon, D-Los Angeles, which will require the state's two large public pension funds, the California Public Employees' Retirement System and the California State Teachers' Retirement System, to divest from coal holdings.
Brown also signed legislation giving state lawmakers two appointments to a powerful state regulatory board that has expansive authority to set regulations laying out how the state will achieve its aggressive emissions reductions target. Under AB1288, the state Legislature can appoint two members to the California Air Resources Board, expanding its size to 14. Currently, only the governor can appoint its members.
And Brown announced signing legislation requiring cities and counties to create a faster process to approve new charging stations, an effort to address a patchwork of regulations throughout the state that have slowed building.
His approval comes a day after he signed aggressive climate change legislation requiring California to get half its electricity from renewable energy sources within 15 years and to double the energy efficiency of existing buildings.
The Democratic governor also signed three oil spill protection bills, months after a pipeline leaked more than 100,000 gallons of crude on the Santa Barbara Coast. The measures call for pipeline operators to use the best spill-control technology, require annual pipeline inspections and require regulators to notify the state Legislature if caustic chemicals are used in a cleanup.
The bills were introduced after the Plains All American Pipeline ruptured underground in May, sending oil onto a beach and into the ocean. The oil spread more than 100 miles.
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California To Phase Out Microbeads Used In Soap And Toothpastes

California To Phase Out Microbeads Used In Soap And Toothpastes....

New York Governor Signs Agreement To Combat <a href="https://www.bing.com/search?q=global+warming&amp;cvid=991b876e79ea4d95b267b6489e791e98&amp;FORM=ANAB01&amp;PC=HCTS">Global Warming</a>. New York Gov. Andrew Cuomo on Thursday joined government leaders worldwide in signing an agreement to help combat global warming and keep the Earth's average temperature from rising dangerously.
The Under Two MOU, a memorandum of understanding signed by more than three dozen government leaders, affirmed New York's commitment to helping keep the Earth's average temperature from rising more than 2 degrees Celsius and committed the state to working to reduce greenhouse gas emissions about 40 percent by 2030. Cuomo said he hoped <a href="http://www.earth.com/video/earth-from-space-new-york-city/">New York</a> would be able to generate 50 percent of its electricity from renewable energy sources by then.
"Climate change is an issue of society's sustainability. To deny that climate change is real is to defy reason ... denial is not a survival strategy," Cuomo told an audience of a few hundred people at Columbia University before signing the agreement.New York Governor Signs Agreement To Combat Global Warming
The memo comes ahead of the United Nations' climate negotiations in Paris in December. Former vice president and environmentalist Al Gore sat next to Cuomo on stage. He said he hoped New York's commitment would send a strong signal to world leaders and encourage others to make the same pledge.
Cuomo said to ignore climate change "is gross negligence by government and irresponsible as citizens." He reaffirmed New York's commitment to address global warming and climate change amid projections showing a rising sea level that could eventually wipe out parts of the state.
"Current projections estimate that sea levels will rise 1 to 4 feet by 2100," the governor said. "If that is true, New York State would be devastated, it's that simple. Even at a fraction of that rise, Manhattan as we know it would be gone."
Gore said Superstorm Sandy in 2012 was able to gain strength because it passed over ocean waters that were about 9 degrees warmer than normal.
"The cumulative amount of manmade global warming now traps as much extra heat energy every day as would be released by 400,000 Hiroshima-class atomic bombs exploding every 24 hours," he said, adding that most of the energy goes into the oceans.
New York state also plans to bring solar energy to 150,000 more homes and businesses and aims to include solar technology in every one of the 64 state universities by 2020.
"Now is the perfect time for the state's aggressive climate commitments," said Kit Kennedy, director of the energy and transportation program at the Natural Resources Defense Council, a nonprofit environmentalist group. "The U.S. is tackling power plant pollution nationwide, countries like China and India have made groundbreaking commitments to tackle their climate emissions, and the international climate talks in Paris are fast-approaching."
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New York Governor Signs Agreement To Combat Global Warming

New York Governor Signs Agreement To Combat Global Warming. New...

NASA's Eyes On Earth Aid Response To Carolina Flooding. It was rain that wouldn't quit. A weather system fueled by warm moisture streaming in from the Atlantic Ocean on Oct. 3 and 4 relentlessly dumped between one and two feet of rain across most of South Carolina. The result was rivers topping their banks and dams bursting. Catastrophic flooding followed across most of the state, which has left residents in some areas without power or clean drinking water.

Tracking and predicting the deluge, both as rain and then floodwater, are the first steps to help protect people in harm's way. State and federal emergency managers have been on the front lines of this natural disaster since it began, armed with weather and flood forecasts from the National Weather Service. NASA has supported these efforts with information based on data from Earth-observing satellites in space -- Eyes On Earth

The Global Precipitation Measurement, or GPM, mission, a joint project of NASA and the Japan Aerospace Exploration Agency (JAXA), provided regular data on the amount of rain falling across the region. The GPM Core Observatory, launched in 2014, combines data with a network of international partner satellites that together provide updated rainfall estimates every three hours. These data, managed by NASA's Goddard Space Flight Center in Greenbelt, Maryland, confirmed the record-breaking rainfall totals and fed into other systems that helped forecast the extent of the flooding in the region.

[caption id="attachment_2385121" align="alignleft" width="150"]<a href="http://cff1.greenatom.net/uploads/2015/10/09095422/joaquin-rainfall_2big_nasa.jpg"><img class="size-thumbnail wp-image-2385121" src="http://cff1.greenatom.net/uploads/2015/10/09095422/joaquin-rainfall_2big_nasa-150x150.jpg" alt="The Global Flood Monitoring maps for Oct. 5 and 6 show where rivers and land surfaces are likely to see flooding. " width="150" height="150" /></a> The Global Flood Monitoring maps for Oct. 5 and 6 show where rivers and land surfaces are likely to see flooding.[/caption]

Equally essential as following the rain is knowing what happens when it reaches the ground. The NASA Short-term Prediction Research and Transition Center, or SPoRT, at Marshall Space Flight Center in Huntsville, Alabama, runs a computer simulation model called the NASA Land Information System for most of the central and eastern United States, including the Carolinas. The SPoRT Project used rainfall data from the GPM mission and measurements from NASA’s Soil Moisture Active Passive satellite in this near real-time simulation, and provided the National Weather Service (NWS) forecast offices with experimental soil moisture data that can aid short-term flood forecasting. Soil moisture describes the ability of the ground to absorb water, like a sponge. During the record setting rainfall event, soil moisture across South Carolina reached 75 to100 percent saturation. At these high levels of saturation, the soil no longer has the sponge capacity to hold the water, so it flows over the land – leading to flash floods.

GPM rainfall data is used in another NASA-funded flood prediction tool that follows water on the ground, the Global Flood Monitoring System, developed and run by researchers at the University of Maryland. The Global Flood Monitoring system takes current satellite rain data and combines it with a model of the land surface – showing slopes, streams, and rivers – and soil moisture to project the likelihood of flooding based on when rivers broke their banks in the past. The Federal Emergency Management Agency (FEMA) and the Department of Homeland Security use these maps to help tell where the flooding is now, after the rainfall, and where flooding may continue in the days ahead as floodwaters move downstream.

Even before the storm clouds cleared, efforts to assess the damage from space had begun. NASA's Advanced Rapid Imaging and Analysis project at the Jet Propulsion Laboratory in Pasadena, California, developed plans to analyze before-and-after data from synthetic aperture radars (SAR) flown by the Italian Space Agency and JAXA. This data can see through clouds to detect changes in the urban environment, such as storm damage to buildings and roads. NASA's Eyes On<a href="http://www.earth.com/video/scientists-study-earth-to-find-similar-worlds/"> Earth</a> Aid Response To Carolina Flooding

NASA uses the vantage point of space to increase our understanding of our home planet, improve lives, and safeguard our future. NASA develops new ways to observe and study Earth's interconnected natural systems with long-term data records. The agency freely shares this unique knowledge and works with institutions around the world to gain new insights into how our planet is changing.

For more on how NASA Earth science benefits people around the world, visit:
<a href="http://go.nasa.gov/earthbenefits" target="_blank" rel="noopener noreferrer">http://go.nasa.gov/earthbenefits</a>

NASA's Eyes On Earth Aid Response To Carolina Flooding

NASA's Eyes On Earth Aid Response To Carolina Flooding. It...

California To Phase Out Microbeads Used In Soap And Toothpastes. Gov. Jerry Brown signed legislation Thursday requiring California to phase out the use of microscopic exfoliating beads -- microbeads -- in personal care products sold in the state starting in 2020 to protect fish and wildlife.
The tiny plastic beads found in soap, toothpaste and body washes are so small that they are showing up in the bodies of fish and other wildlife after passing through water filtration systems without disintegrating.
Assemblyman Richard Bloom, D-Santa Monica, said his bill, AB888, seeks to drastically restrict all use of the non-biodegradable beads, which can contain various toxins.
"AB888 was carefully crafted to avoid any loopholes that would allow for use of potentially harmful substitutes," Bloom said in a statement Thursday. "This legislation ensures that personal care products will be formulated with environmentally-safe alternatives to protect our waterways and oceans."
A number of companies are replacing microbeads with natural substances such as ground-up fruit pits.
California lawmakers have attempted similar legislation before, but they met opposition from personal-care product companies. Amendments to the measure this year prompted many business critics to drop their opposition to California joining several other states in eliminating the so-called microbeads.
The microbead ban was one of several pieces of legislation Brown signed Thursday in response to concerns about environmental degredation.
He approved SB185 by Senate President Pro Tem Kevin de Leon, D-Los Angeles, which will require the state's two large public pension funds, the California Public Employees' Retirement System and the <a href="http://www.earth.com/video/santa-barbara-county-in-southern-california/">California</a> State Teachers' Retirement System, to divest from coal holdings.
Brown also signed legislation giving state lawmakers two appointments to a powerful state regulatory board that has expansive authority to set regulations laying out how the state will achieve its aggressive emissions reductions target. Under AB1288, the state <a href="https://www.bing.com/search?q=legislature&amp;cvid=b9fc4e1c194f441bb7b5e350e11015d5&amp;FORM=ANAB01&amp;PC=HCTS">Legislature</a> can appoint two members to the California Air Resources Board, expanding its size to 14. Currently, only the governor can appoint its members. California To Phase Out Microbeads Used In Soap And Toothpastes
And Brown announced signing legislation requiring cities and counties to create a faster process to approve new charging stations, an effort to address a patchwork of regulations throughout the state that have slowed building.
His approval comes a day after he signed aggressive climate change legislation requiring California to get half its electricity from renewable energy sources within 15 years and to double the energy efficiency of existing buildings.
The Democratic governor also signed three oil spill protection bills, months after a pipeline leaked more than 100,000 gallons of crude on the Santa Barbara Coast. The measures call for pipeline operators to use the best spill-control technology, require annual pipeline inspections and require regulators to notify the state Legislature if caustic chemicals are used in a cleanup.California To Phase Out Microbeads Used In Soap And Toothpastes
The bills were introduced after the Plains All American Pipeline ruptured underground in May, sending oil onto a beach and into the ocean. The oil spread more than 100 miles.
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The Horn of Africa has become increasingly arid in sync with the global and regional warming of the last century and at a rate unprecedented in the last 2,000 years, according to new research led by a University of Arizona geoscientist.

The region has suffered deadly droughts every few years in recent decades.

The scientists suggest as global and regional warming continues, the eastern Horn of Africa, which includes Somalia, Djibouti and Ethiopia, will receive progressively less rain during the crucial "long rains" season of March, April and May.

Such a trend could exacerbate tensions in one of the most geopolitically unstable regions in the world.

The team's suggestion that the Horn of <a href="http://www.earth.com/image/the-gambia-river-in-west-africa/">Africa</a> will become even drier contradicts the global climate models that indicate future warming will bring more rain to the region.

"What we see in the paleoclimate record from the last 2,000 years is evidence that the Horn of Africa is drier when there are warm conditions on Earth, and wetter when it is colder," said lead author Jessica Tierney, a UA associate professor of geosciences. Horn Of Africa Is Drying Much Faster As Climate Warms

"The rate of the recent drying in the Horn of Africa is unprecedented in the last 2,000 years," Tierney said.

In their paper, the scientists call for researchers to develop more computer models of climate that focus on the regional scale. Such models might better predict how future warming will affect the Horn of Africa's seasonal rains.

Study co-author Peter deMenocal said, "The region is drying in sync with carbon emissions. This has significant socioeconomic implications for this geopolitical hotspot into the future." The Center for Climate and Life at Columbia University's Lamont-Doherty Earth Observatory is headed by deMenocal.

The researchers used cores of ancient marine sediments from the nearby Gulf of Aden to reconstruct regional temperature and aridity for the past 2,000 years.

The team found their reconstructions of local temperature and aridity were in step with an independent reconstruction of Northern Hemisphere temperatures stretching back to the year A.D. 1. All the data point to the Horn of Africa becoming warmer and drier in the last 100 years.

The team's report, "Past and future rainfall in the Horn of Africa," was published online today in the open-access journal Science Advances. Co-author Caroline Ummenhofer is at Woods Hole Oceanographic Institution in Massachusetts. The National Science Foundation funded the research.

---

<a href="http://www.arizona.edu" target="_blank" rel="noopener noreferrer">University of Arizona</a>

Horn Of Africa Is Drying Much Faster As Climate Warms

The Horn of Africa has become increasingly arid in sync...

Alaska Tanker Shipping Lanes Threatened By More And Smaller Icebergs. Icebergs that threaten tankers in Alaska tanker shipping lanes carrying oil from the trans-Alaska pipeline are likely to be smaller but more numerous over the next two decades, according to a study by a citizens oversight group.
Ice that calves off the Columbia Glacier near Valdez has to travel farther to reach shipping lanes because the glacier has receded more than 10 miles since 1980, according to the report prepared for the Prince William Sound Regional Citizens' Advisory Council. The longer distance to <a href="https://www.bing.com/search?q=prince+william&amp;cvid=f64c27614a494d3bb0ab55d7b93b3c59&amp;FORM=ANAB01&amp;PC=HCTS">Prince William</a> Sound means icebergs have more opportunity to shrink from melting and fracturing.
Ice remains a serious threat, however. Smaller icebergs can more easily clear an underwater barrier, the glacier's terminal moraine, which grounds the largest icebergs leaving Columbia Bay. The smaller icebergs that can float over the moraine will continue to be a hazard, said Mark Swanson, director of the council.
"It's going to pose a risk for shipping for the foreseeable future," until the glacier finally retreats out of the ocean and onto land, he said by phone from Valdez.
The citizen's council was created in the aftermath of the grounding of the Exxon Valdez, a 987-foot tanker that struck Bligh Reef on March 24, 1989. The Exxon Valdez spilled roughly 11 million gallons of crude oil. It was the nation's largest oil spill until the 2010 Deepwater Horizon blowout in the Gulf of Mexico.
The crew of the Exxon Valdez had received permission to stray from shipping lanes to avoid Columbia Glacier ice.
"They just forgot to turn back and then they found a reef," Swanson said. "They avoided one hazard and found another."
An iceberg figured into a second tanker incident five years later. The 894-foot Overseas Ohio, heading north to pick up oil, struck an iceberg head-on. The collision tore a 17-by-20-foot hole in the vessel's bulbous bow.
Icebergs that ride low in the water, weighed down by rock, are hard to see.
"Those are the ones that could really booger up a ship," said Swanson, a former Coast Guard officer who was captain of the port in Valdez from 2002 to 2005. Alaska Tanker Shipping Lanes Threatened By More And Smaller Icebergs
The trans-Alaska pipeline these days carries an average of 496,571 barrels of Alaska North Slope crude oil per day. Tankers carry the oil to West Coast refineries.
Advancing glaciers flowing into the ocean gouge a deep trench and push forward a wall of rock and debris on which ice rests. As the <a href="http://www.earth.com/news/new-species-of-sea-sponge-discovered-in-british-columbia/">Columbia</a> Glacier has retreated, that underwater terminal moraine has acted as a barrier to big icebergs near the head of Columbia Bay. The moraine is 60 feet deep at its deepest point. In the past, Swanson said, large icebergs would run aground on the moraine and clog the movement of icebergs.
The study by W. T. Pfeffer Geophysical Consultants LLC revealed that that height of the moraine has not been affected. However, many more icebergs are simply floating over it.
Shipping lanes begin 12 miles east of the bay.
The Coast Guard manages ice risk with 24-hour radar. Five of the escort tug boats dispatched to accompany tankers in and out of Valdez are equipped with radar that can detect ice.
"There are probably 50, 60 days per year when tanker traffic is in some way restricted based on ice hazards," Swanson said. That could mean operating in daylight only, one-way traffic or complete closure of the shipping lanes.
One purpose of the study was to figure out how far the glacier would have to retreat to be on dry land. For the glacier's main branch, that could happen as early as 2029, according to the report. The east branch of the glacier would take longer.
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Alaska Tanker Shipping Lanes Threatened By More And Smaller Icebergs

Alaska Tanker Shipping Lanes Threatened By More And Smaller Icebergs....

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Nushagak Bay in southwest Alaska

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Flu viruses are more flexible than expected

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Detecting mercury contamination with the tap of a finger

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Kainji Lake, a reservoir on the Niger River.



In 1968, Kainji Lake was created by the construction of the Kainji Dam. The Niger River, the third longest in Africa, enters the lake in the north.&nbsp;



According to <a href="https://www.earth.com/news/rivers-in-the-american-west-are-a-lifesaving-resource-for-birds/">ESA</a>, the creation of the lake submerged Foge Island and the town of Bussa and permanently flooded other riverine settlements, leaving around 50,000 people displaced.&nbsp;



Large parts of Foge Island are temporarily exposed during low water tides, and the land is often used by migrating fishermen. Kainji Dam is a dam across the Niger River in Niger State of Central Nigeria. 



Wild mammals occur at relatively low densities due to illegal hunting. Lake Kainji has suffered a dramatic decline as a fishery due to the high numbers of artisanal and subsistence fisherfolk using the lake. It has been suggested that a period of closure, together with controlled fishing rights may help improve fish stocks.



Kainji Lake National Park is the oldest of its kind in Nigeria. The park contains three distinct areas: a part of the Kainji Lake, the Borgu Game Reserve to the west of the lake, and the Zugurma Game Reserve to the southeast. The park is home to around 65 mammal species, 350 bird species, and 30 species of reptiles and amphibians. 



Video/ Image Credit: European Space Agency&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Kainji Lake in north central Nigeria

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Today’s Video of the Day from <a href="https://www.igb.illinois.edu/">Carl R. Woese Institute for Genomic Biology</a> reveals how scientists can modify common crops like soybean, rice, and wheat to protect them from heat stress.



“We need to double crop production by 2050 to feed a growing global population, and not only are we not on track to do that, but climate change is further complicating things,” said Amanda Cavanagh, a lecturer at the University of Essex. 



The study is part of Realizing Increased Photosynthetic Efficiency (RIPE), an international research project that aims to develop food crops that turn the sun’s energy into food more efficiently.



“Using an engineering approach we designed multiple alternative metabolic pathways to photorespiration. Testing them in the field showed increases in productivity which led Amanda to significantly move the project forward by showing our engineered plants can withstand pretty extreme temperature stress,” said study co-author and RIPE researcher Paul South.&nbsp;



“As the climate changes and temperature stresses increase the pressure on our global food supply, farmers will need every tool available including engineering approaches like the synthetic biology used here to maintain safe and productive harvests.”



The experts tested plants modified to have more efficient photorespiration to see if they were better adapted to warmer temperatures.&nbsp;



The team found that the engineered plants produced 26 percent more biomass than the wild-type plants exposed to the same temperatures, and had 15 percent less yield loss under the higher temperatures.



Video Credit: Amanda Nguyen/University of Illinois



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Designing crops that can beat the heat

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> explores the ability of salt to transform the way that foods and beverages taste. Salt is known to cover up undesirable flavors, such as bitterness in coffee or beer, but how exactly does sodium chloride change the taste of other compounds?



One previous study showed that, not only does salt suppress bitterness, but also enhances sweetness and sourness. Another study revealed that bitterness reduction by salt seems to be happening at the tongue receptor level as well as in the brain.&nbsp;



While it is known that salt taste is mediated by the presence of sodium channels in the form of taste buds, experts believe that there is also an unknown receptor responsible for how we taste salt that has not yet been identified.&nbsp;



Video Credit: ACS Reactions



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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How does salt makes things taste better?

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Santiago, the capital city of Chile. The city is located in the center of the Santiago Metropolitan Region, which has a population of about eight million people.&nbsp;



'The weather of Santiago resembles the Mediterranean climate with dry and warm summers with temperatures reaching up to 35°C (from October to March) and cool and humid winters that can drop to 0°C (from April to September)."



"The city lies in the centre of the country’s central valley around 80 km from the Pacific Ocean to the west and borders Argentina to the east. A tiny part of Argentina is visible in the top-right corner of the image where the mountain crest of the Andes Mountains acts as a divider between the two countries," says ESA.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Santiago, Chile in South America

[sendtonews key="JRaP49ISmm-2357509-12187" type="single"] Today’s Video of the Day from the...

Spiral,Galaxy,,Illustration,Of,Milky,Way

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Astronomers at <a href="https://www.jhu.edu/">Johns Hopkins University</a> have created an interactive map of the universe, including the actual position and real colors of 200,000 galaxies. The map allows the public to access data that was previously only available to scientists.



The map was developed using data collected by the Sloan Digital Sky Survey. For over two decades, a telescope in New Mexico was aimed at slightly different locations to capture the night sky.&nbsp;



"Growing up I was very inspired by astronomy pictures, stars, nebulae and galaxies, and now it's our time to create a new type of picture to inspire people," said map creator Brice Ménard, a professor at Johns Hopkins. "Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries. But nobody took the time to create a map that is beautiful, scientifically accurate, and accessible to people who are not scientists. Our goal here is to show everybody what the universe really looks like."



"In this map, we are just a speck at the very bottom, just one pixel. And when I say we, I mean our galaxy, the Milky Way which has billions of stars and planets. We are used to seeing astronomical pictures showing one galaxy here, one galaxy there or perhaps a group of galaxies. But what this map shows is a very, very different scale."



"From this speck at the bottom, we are able to map out galaxies across the entire universe, and that says something about the power of science."



The <a href="https://mapoftheuniverse.net/">interactive map</a> is available online, where it can be downloaded for free.



Video Credit: Johns Hopkins&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Interactive map of the universe includes 200,000 galaxies

[sendtonews key="e4ZG0Jawp3-2374785-12187" type="single"] Astronomers at Johns Hopkins University have created...

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes the first comprehensive estimate of carbon density in the Saharan, Sahel, and Sudanian zones of Africa. In an effort to measure the amount of carbon stored across these drylands, a team of scientists used high-resolution satellite images and artificial intelligence to map nearly 10 billion individual trees. 



"The high spatial resolution (50 cm) combined with AI and field measurements used in this study is key to improving tree inventories in drylands," said Pierre Hiernaux, a French researcher working for NASA. "The ever-increasing availability of very high-resolution satellite imagery will make it possible to assess carbon pools and their dynamics at the individual tree level on a global scale."



"This study is exceptional because it is pioneering a type of approach that will revolutionize the monitoring of trees and forests on a global scale: in the short term, it will be possible to map the world's trees from the centre of the Amazon to our schoolyards," said <a href="https://www.inrae.fr/en">INRAE</a> researcher Jean-Pierre Wigneron.



"Many fields of application will become much more efficient and accurate, such as tracking carbon stocks, biodiversity, monitoring logging and protection against illegal forest degradation, in near real time.”



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Remote sensing will revolutionize the way we monitor trees

[sendtonews key="EjmSP20gQK-2593093-12187" type="single"] Today's Video of the Day from NASA...

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Dublin, the capital and largest city of Ireland. Beyond its pub culture, Dublin is known as a modern culinary destination and a UNESCO City of Literature.



"Dublin is located near the midpoint of Ireland’s east coast in the province of Leinster. The city, which covers an area of around 115 square kilometers, is bordered by the Dublin Mountains, a low mountain range to the south, and is surrounded by flat farmland to the north and west," says ESA.



"The city straddles the River Liffey, which rises in the Wicklow Mountains and flows around 80 kilometers eastwards through the city of Dublin, in which it is canalised and bordered with quays. It then empties into Dublin Bay, an arm of the Irish Sea."



Dublin has an abundance of green spaces, including one of the largest enclosed public parks in any European capital city. Phoenix Park, which was originally formed as a royal hunting park in the 1660s, includes 707 hectares of green space.



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The city of Dublin on Ireland's east coast

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the province of Zaragoza in northeast Spain. The image was captured by the Copernicus Sentinel-2 mission.



"Together with the provinces of Huesca and Teruel, Zaragoza formed the old kingdom of Aragon. Its capital, also called Zaragoza (not visible in this image) is home to around half of Aragon’s population," says ESA.



"The Ebro River can be seen winding its way through the province from west to east in this image. Between its source in the Cantabrian Mountains in the northwest and its delta on the Mediterranean coast, the Ebro River is fed by more than 200 tributaries as it flows 910 km across much of northern Spain."



Since rainfall is very scarce in this region, irrigation in the Ebro basin is critically important. In the valleys surrounding the Ebro River, many fields are used for growing crops such as corn, wheat, and barley.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The province of Zaragoza in northeast Spain

[sendtonews key="oL4FnPTGCV-2384527-12187" type="single"] Today's Video of the Day from the...

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> features a visual dataset of.methane emissions from wetlands across the globe. Atmospheric methane levels have reached record highs in recent years, and wetlands are a major source of these emissions.&nbsp;



"Methane is an important greenhouse gas that contributes substantially to global warming. On a molecule by molecule basis, methane is much more efficient at trapping heat than carbon dioxide, the main driver of warming," says NASA.



"Though human activities, including agriculture, oil and natural gas production and use, and waste disposal, collectively contribute the majority of methane to the atmosphere, about a third of total methane emissions comes from wetlands."&nbsp;



According to NASA, understanding methane emissions from wetlands and other natural sources is critically important for scientists and policymakers who are working to combat climate change by reducing emissions from human activities.



Video Credit: NASA Goddard



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Wetlands are a major source of methane emissions

[sendtonews key="f8fukm28Vz-2491833-12187" type="single"] Today's Video of the Day from NASA...

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> reveals the evolution of the Columbia Glacier in southeastern Alaska. Columbia is among the fastest shrinking glaciers in the world, and the video documents its rapid retreat over the years.&nbsp;



Columbia Glacier is a large, multi-branched calving glacier that flows out of the Chugach Mountains to the Prince William Sound.&nbsp;



According to USGS, Columbia had a long history of stability prior to 1980, with a length 41 miles, and small, short-lived advances or retreats.



In the years since 1980, however, satellite images have captured Columbia’s alarming retreat. By using false-color images, scientists can distinguish between snow and ice, open water, vegetation, and rocky debris on the glacier’s surface.



The series of false-color images featured in today's video were acquired over the span of 35 years. You can see that by 2021, the glacier’s main branch had retreated about 15 miles from its initial position.



The Columbia Glacier has also lost more than 50 percent of its volume, mostly due to calving. <a href="https://www.earth.com/video/nasa-reveals-3d-visual-of-an-atmospheric-river/">NASA</a> reports that while climate change likely started the retreat, mechanical processes kept the disintegration going.



The NASA images are provided by Jesse Allen, Robert Simmon, Joshua Stevens, and Lauren Dauphin using data from Landsat satellites, from the U.S. Geological Survey, and data from MODIS on NASA’s Terra satellite. The structure of Columbia’s moraine played a large role in the stability of the glacier before 1980. 



Like other tidewater glaciers, the Columbia built up a moraine over time, and the mixture of ice and rock functioned like a dam keeping out the sea. It was supported on one end by the shoreline and by the underwater terminal moraine at the other.



Video Credit: NASA Earth Observatory/&nbsp; NASA’s Scientific Visualization Studio



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The rapid retreat of the Columbia Glacier

[sendtonews key="0879czfG3k-1785905-12187" type="single"] Today’s Video of the Day from NASA...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the Pyrenees Mountains, which form a natural boundary between France and Spain in southwest Europe.



The mountain range is 430 kilometers in length. It stretches from the Mediterranean Sea on the east to the Atlantic Ocean on the west.



At an elevation of 3404 meters, Pico de Aneto is the highest mountain peak in the Pyrenees, and the third-highest peak in Spain. Pico de Aneto is located in the Posets-Maladeta Natural Park, which spans more than 82,000 acres.&nbsp;



"Geological studies have revealed that the Pyrenees Mountains have been around for longer than the Alps, with their sediments first deposited in coastal basins during the Paleozoic and Mesozoic eras," reports ESA.



"The entire mountain range formed due to the upwelling of large sedimentary rocks by the collision of the Iberian and the Eurasian plate around 100 to 150 million years ago, followed by intense erosion from ice and water."



The western Pyrenees receive more precipitation due to moisture blowing in from the Atlantic Ocean. The mountain range contains many lakes, several small glaciers, and some of the highest waterfalls in Europe.



Video &amp; Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The Pyrenees Mountains in southwest Europe

[sendtonews key="6HyfrAJTBI-1831843-12187" type="single"] Today’s Video of the Day from the...

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Today’s Video of the Day from <a href="https://www.stowers.org/">Stowers Institute for Medical Research</a> describes why experts are studying zebrafish to gain a better understanding of how the immune system responds to injury. Zebrafish have the ability to repair and regenerate organs.



“Organ regeneration offers an exciting opportunity for studying the immune system and to inquire why some species can regenerate organs like the heart or missing limbs while others like humans cannot,” explained Dr. Tatjana Piotrowski.



Zebrafish sensory organ hair cells are an ideal system to investigate the pathways and cell types involved in regeneration since they are easily destroyed with antibiotics and begin regenerating within five hours. This enabled the researchers to identify the exact timing and genetic programs for each anti-inflammatory macrophage activation state.&nbsp;



“Our hypothesis is that human macrophages do not receive the proper chemical activation 'cocktail' to instruct pro-regenerative processes,” said Dr. Nicolas Denans. “Identifying the molecular recipe of macrophage activation in zebrafish may one day enable us to design regenerative immunotherapies in humans.”&nbsp;&nbsp;&nbsp;



“The new evidence is a valuable resource for comparative studies on the genetic programs involved in macrophage-mediated repair and regeneration. In other words, different types of injuries may induce different kinds of inflammatory responses. We want to decipher whether this 'language' is universal or if there are a variety of dialects."



Video Credit: Stowers Institute for Medical Research&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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How the immune system responds to injury

[sendtonews key="0dEcERCq61-2283382-12187" type="single"] Today’s Video of the Day from Stowers...

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes how record-breaking heat expressed itself around the world in 2022.



Scientists have determined that 2022 was the 5th warmest year since 1880. Furthermore, the last nine consecutive years have been the warmest on record.



From devastating floods and wildfires to natural disasters like Hurricane Ian, 2022 showed us yet again how a warming climate affects people across the globe.&nbsp;



"As we look back at 20:22 and years past, we see that each year we better understand the challenges we face and how important it is to meet them," says NASA.



Video/ Image Credit: NASA Goddard



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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2022 illustrated the consequences of a warming climate

[sendtonews key="3UUsNkFOuS-2487333-12187" type="single"] Today's Video of the Day from NASA...

Earth,Like,Exoplanet,3d,Render

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes two exoplanets that are orbiting a star 218 light-years away. A team of researchers led by the University of Montreal has found evidence that these planets are "water worlds."



The experts used data from NASA’s Hubble and Spitzer Space Telescopes. They discovered that exoplanets Kepler-138 c and Kepler-138 could be composed largely of water.



"We previously thought that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-Earths," explained study co-author Björn Benneke.&nbsp;



"However, we have now shown that these two planets, Kepler-138 c and d, are quite different in nature and that a big fraction of their entire volume is likely composed of water. It is the best evidence yet for water worlds, a type of planet that was theorized by astronomers to exist for a long time."



Video Credit: NASA Goddard



Image Credit: NASA, ESA, and Leah Hustak (STScI)



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Two distant planets may be "water worlds"

[sendtonews key="QIoVYJqRBi-2434608-12187" type="single"] Today's Video of the Day from NASA...

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Satellites reveal how Earth's systems are interconnected Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes Earth’s interconnected systems, and how this network is affected by rising temperatures.&nbsp;



During 2020, average global temperatures matched the hottest year on record. The hurricane season was also record-breaking, with many of the storms intensifying at extraordinary speeds. Hot water in the ocean is fuel for hurricanes. The satellite data shows that it's all one interconnected system showing how Satellites reveal how Earth's systems are interconnected.



According to NASA, dust swept up from Northern Africa plays a major role in the formation of hurricanes, and is also a key source of fertilization in the Amazon rainforest. As a result of<a href="https://www.earth.com/news/seagrass-wasting-disease-is-fueled-by-climate-change/"> climate</a> change, dust plumes are expected to decline, which will have an effect on vegetation far away.&nbsp;



Images from Earth-observing satellites show how the world’s plant life is affected by natural disasters, fires, and deforestation. Satellites also reveal how widespread changes in vegetation impact waterways,&nbsp; the climate, air quality. Satellites communicate by using radio waves to send signals to the antennas on the Earth. "Earth From Space" is a groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. 



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Satellites reveal how Earth's systems are interconnected

[sendtonews key="JbW4VsY53O-1632195-12187" type="single"] Satellites reveal how Earth's systems are interconnected...

Today’s Video of the Day from the <a href="https://welcome.miami.edu/">University of Miami</a> Rosenstiel School of Marine and Atmospheric Science explores how changes in water temperatures have affected tiger shark habitats and movements in the North Atlantic Ocean. The study reveals that rising temperatures have caused the sharks to shift toward the poles over the past 40 years.



“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” explained study lead author Neil Hammerschlag. “These results have consequences for tiger shark conservation, since shifts in their movements outside of marine protected areas may leave them more vulnerable to commercial fishing.”



The researchers analyzed nine years of tracking data from satellite-tagged tiger sharks, combined with four decades of conventional tag and recapture data provided by National Oceanic and Atmospheric Administration (NOAA) Cooperative Shark Tagging Program.



The experts found that during the last decade of record heat, for every one-degree Celsius increase in water temperatures, tiger sharks migrated further poleward by over 400 kilometers. They also migrated two weeks earlier than usual to waters off the northeastern coast of the United States.



“Given their role as apex predators, these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans,” concluded Professor Hammerschlag.



Video Credit: University of Miami Rosenstiel School of Marine and Atmospheric Science



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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Tiger sharks are shifting poleward as temperatures rise

Today’s Video of the Day from the University of Miami...

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