Circadian rhythms are the natural, internal processes that regulate the sleep-wake cycle and repeat roughly every 24 hours. 



These rhythms, influenced by environmental cues like light and darkness, play a crucial role in various bodily functions ranging from sleep regulation to hormone release.



When these rhythms fall out of sync - due to factors such as artificial lighting, irregular schedules, or travel across time zones - people can experience disruptions in sleep, mood, and overall well-being.



<h2 class="wp-block-heading" id="h-lights-reset-circadian-rhythms">Lights reset circadian rhythms</h2>



New research has revealed that the vibrant blue and orange hues seen at sunrise and sunset may hold the key to resetting these rhythms. 



By mimicking these natural light cycles, scientists at the University of Washington in Seattle have developed a novel LED light that emits alternating wavelengths of blue and orange. 



The LED device, designed to realign circadian rhythms, has been proven to significantly advance melatonin production. This could offer a promising solution for those suffering from sleep disorders and other health issues linked to circadian misalignment. 



<h2 class="wp-block-heading" id="h-improving-circadian-health">Improving circadian health</h2>



Published in the Journal of Biological Rhythms, the research represents a breakthrough in how humans can influence circadian rhythms. 



The findings hold significant promise for improving circadian health. Study co-author Jay Neitz is a professor of ophthalmology in the UW School of Medicine. 



“Our <a href="https://www.earth.com/news/exercising-shift-internal-clock/" target="_blank" rel="noreferrer noopener">internal clock</a> tells us how our body's supposed to act during different times of day, but the clock has to be set. If our brain is not synced to the time of day, then it's not going to work right," said Professor Neitz.



<h2 class="wp-block-heading" id="h-disrupted-circadian-rhythms">Disrupted circadian rhythms </h2>



The study suggests new strategies to combat seasonal affective disorder (SAD) and other health issues linked to disrupted circadian rhythms, offering hope for improving <a href="https://www.earth.com/news/sleep-quality-is-determined-by-daily-activities/" target="_blank" rel="noreferrer noopener">sleep quality</a>, mood stabilization, and overall mental health.



Circadian rhythms are naturally reset daily by the 24-hour solar light-dark cycles, which help regulate our biological processes in alignment with the environment. 



Professor Neitz noted that the light used in the LED device has alternating blue and orange wavelengths which stimulate the circuit that our brains use to reset our internal clocks.



<h2 class="wp-block-heading" id="h-the-role-of-melatonin">The role of melatonin </h2>



<a href="https://www.earth.com/news/melatonin-keeps-fruits-and-vegetables-fresh-as-well-as-helping-you-sleep/" target="_blank" rel="noreferrer noopener">Melatonin</a>, the hormone responsible for sleep regulation and the body’s natural sleep-wake cycle, is produced when light signals from the eyes stimulate specific areas of the brain to begin the winding-down process for <a href="https://www.earth.com/news/how-sleep-patterns-affect-your-health-over-time/" target="_blank" rel="noreferrer noopener">sleep</a>.



This hormone plays a critical role in helping the body adjust to darkness, promoting relaxation, and ensuring restful sleep.



People spending more time under artificial light, especially in the evening, often experience delayed melatonin production, which can disrupt their sleep patterns and overall well-being. 



Prolonged exposure to artificial lighting can also interfere with the body’s ability to properly align with natural day-night cycles, contributing to sleep disturbances and fatigue.



To address this issue, the research team conducted a study comparing different types of artificial lights to measure their impact on melatonin production and their effectiveness in resetting circadian rhythms.



<h2 class="wp-block-heading" id="h-a-revolutionary-approach-to-lighting">A revolutionary approach to lighting</h2>



Unlike other commercial products that emphasize blue light to trigger melanopsin, this new LED light emits alternating blue and orange wavelengths, which stimulate a different circuit in the retina. 



“The light we developed does not involve the melanopsin photopigment. It stimulates a blue-yellow opponent circuit that operates through cone photoreceptors in the retina," explained Professor Neitz.



In an experiment, participants were exposed to three different light devices. The alternating blue-orange LED led to the most significant shift in melatonin production, advancing it by 1 hour and 20 minutes, compared to just 40 minutes for the blue LED and 2.8 minutes for white light.



“Even though our light looks white to the naked eye, we think your brain recognizes the alternating blue and orange wavelengths as the colors in the sky,” said Professor Neitz.



<h2 class="wp-block-heading" id="h-lighting-the-way-forward">Lighting the way forward</h2>



The LED device has now been successfully commercialized through the University of Washington. The product is distributed by TUO, a Chicago-based company. This marks an important step toward bringing this technology to the public.



By harnessing the natural color palette of sunrise and sunset, this innovative lighting solution offers a new approach to resetting circadian rhythms, potentially transforming how we address <a href="https://www.earth.com/news/daylight-saving-time-changes-are-directly-linked-to-sleep-disorders/" target="_blank" rel="noreferrer noopener">sleep disorders</a>, mood regulation, and overall health.



The technology holds the promise of improving well-being for those affected by modern lighting and lifestyle challenges, helping individuals reconnect with the rhythms of the natural world.



The study is published in the journal <a href="https://journals.sagepub.com/doi/10.1177/07487304241262918" target="_blank" rel="noreferrer noopener">Journal of Biological Rhythms</a>.



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Colors of sunset and sunrise reset our circadian rhythms

Circadian rhythms are the natural, internal processes that regulate the sleep-wake cycle and repeat roughly every 24 hours. These rhythms, influenced by environmental cues like light and darkness, play a crucial role in various bodily functions ranging from sleep regulation to hormone release. When these rhythms fall out of sync - due to factors such as artificial lighting, irregular schedules, or travel across time zones - people can experience disruptions in sleep, mood, and overall well-being. Lights reset circadian rhythms New research has revealed that the vibrant...

Plants need more nitrogen to combat climate change. Plants can grow faster as atmospheric carbon dioxide concentrations increase, but only if they have enough nitrogen or partner with fungi that help them get it, according to new research published this week in Science.

The study was led by César Terrer Moreno, a Ph.D. student at Imperial College London, and included researchers from <a href="http://www.nau.edu" target="_blank" rel="noopener noreferrer">Northern Arizona University</a>, the University of Antwerp (Belgium), Indiana University and New South Wales University (Australia).

The team synthesized more than 80 past experiments and found that higher CO2 boosted plant growth, as long as the plants received enough nitrogen. Without added nitrogen, CO2 had no effect, confirming the long-standing idea that nitrogen limits plant response to rising CO2. But there was a major exception: some plants--those with specialized partnerships with soil fungi--were able to respond to the extra CO2, just as much as if they had been fertilized with nitrogen. Plants need more nitrogen to combat climate change

"Nitrogen and mycorrhizae are like the X-factors in plant responses to CO2," said Bruce Hungate, Director of NAU's Center for Ecosystem Science and Society and Regents' Professor of Biological Sciences, who was a co-author on the study. "Rising CO2 is not a universal fertilizer, but neither is nitrogen limitation a universal restriction on the CO2 response. The truth is in the middle, and microbes are the key mediators," Hungate said.

Most plants associate with mycorrhizal fungi, a partnership in which the fungus provides the plant with nutrients and water and receives food from the plant in return. But not all mycorrhizae are the same. Arbuscular mycorrhizal fungi specialize in taking up phosphorus from the soil, but not nitrogen, and plants that associated with arbuscular mycorrhizae were unable to respond to CO2 unless extra nitrogen was added. It was the plants that form ectomycorrhizal partnerships that responded to extra CO2 without any added nitrogen fertilizer, because these fungi produce enzymes that liberate bound nitrogen from soil organic matter, and the fungi can take up the nitrogen and pass some along to the plant.

This synthesis helps resolve a long-standing debate about the role of nitrogen limitation for plant responses to CO2. Without enough nitrogen, it is thought that plants will be unable to respond much to rising CO2, and many experiments support this idea. But in some experiments where nitrogen is in short supply, the plants still grow more with elevated CO2, and the reasons have puzzled scientists for many years. The new synthesis offers a clear answer: "Plants need nitrogen to respond to high CO2, whether they find it readily available in the soil, or whether their mycorrhizal partners can help them get it," explained Hungate.

The research should help project climate change into the future. Forests, grasslands and other ecosystems around the world currently absorb about 30 percent of human CO2 emissions, without which climate change would be happening even faster than it is now. The future of this terrestrial carbon sink depends on carbon accumulation by ecosystems through plant growth. This new research shows that it is essential to take into account mycorrhizal fungi, and suggests that the next generation of global carbon cycle models should include mycorrhizae as an important control point on plant responses to rising CO2 in the atmosphere. It is well known that grasses and herbs form arbuscular mycorrhizae, and that many trees form ectomycorrhizae. Since global carbon cycle models already recognize these different plant forms, adding mycorrhizae to models of the carbon cycle should be straightforward, and the team is already moving toward that goal.

Plants need more nitrogen to combat climate change

Plants need more nitrogen to combat climate change. Plants can...

Fukushima disaster and the oceans: What do we know, 5 years on?. A major international review of the state of the oceans 5 years after the Fukushima disaster shows that radiation levels are decreasing rapidly except in the harbour area close to the nuclear plant itself where ongoing releases remain a concern. At the same time, the review's lead author expresses concern at the lack of ongoing support to continue the radiation assessment, which he says is vital to understand how the risks are changing.

These are the conclusions of a major 5 year review, with multi-international authors who are all working together as part of a <a href="http://www.whoi.edu/CMER/rio5-working-group" target="_blank" rel="noopener noreferrer">Scientific Committee on Oceanic Research (SCOR) Working Group</a>. The report is being presented at the Goldschmidt geochemistry conference in Japan. The review paper is also published in Annual Review of Marine Science*. The main points made by the report are:
<ul>
 	<li>The accident. The Tohoku earthquake and tsunami on March 11, 2011 led to the loss of power and overheating at the Fukushima Daiichi Nuclear Power Plants (FDNPP), causing extensive releases of radioactive gases, volatiles and liquids, in particularly to the coastal ocean. The radioactive fall-out on land is well-documented, but the distribution of radioactivity in the seas and onto the wider oceans is much more difficult to quantify, due to variability in the ocean currents and greater difficulty in sampling.</li>
 	<li>Initial release of radioactive material. Although the FDNPP accident was one of the largest nuclear accidents and unprecedented for the ocean, the amount of 137Cs released was around 1/50th of that released by the fall out of nuclear weapons and 1/5th that released at Chernobyl. It is similar in magnitude to the intentional discharges of 137Cs from the nuclear fuel reprocessing plant Sellafield.</li>
 	<li>Initial fallout. The main release of radioactive material was the initial venting to the atmosphere. Models suggest that around 80% of the fallout fell on the ocean, the majority close to the FDNPP. There was some runoff from the land, peaking around 6 April 2011. There is a range of estimates of the total amount of 137Cs release into the ocean, with estimates clustering around 15-25 PBq (PetaBecquerel, which is 1015 Becquerel. One Becquerel is one nuclear decay per second). Other radioisotopes were also released, but the focus has been on radioactive forms of Cs given their longer half-lives for radioactive decay (134Cs = 2 yrs; 137Cs = 30 yrs) and high abundance in the FDNPP source.</li>
 	<li>Distribution in water. Cs is very soluble, so it was rapidly dispersed in the ocean. Prevailing sea currents meant that some areas received more fall-out than others due to ocean mixing processes. At its peak in 2011, the 137Cs signal right at the FDNPP was tens of millions of times higher than prior to the accident. Over time, and with distance from Japan, levels decrease significantly. By 2014 the 137Cs signal 2000km North of Hawaii was equivalent to around six times that remaining from fallout from atmospheric nuclear tests from the 1960's, and about 2-3 times higher than prior fallout levels along the west coast of N. America. Most of the fallout is concentrated in the top few hundred metres of the sea. It is likely that maximum radiation levels will be attained off the North American coast in the 2015-16 period, before declining to 1-2 Bq per cubic metre (around the level associated with background nuclear weapon testing) by 2020. Sea-floor sediments contain less than 1% of the 137Cs released by the FDNPP, although the sea-floor contamination is still high close to the FDNPP. The redistribution of sediments by bottom-feeding organisms (more common near the coast) and storms is complex.</li>
 	<li>Uptake by marine life. In 2011, around half the fish samples in coastal waters off Fukushima had radiocesium levels above the Japanese 100Bq/kg limit, but by 2015 this had dropped to less than 1% above the limit. High levels are still found in fish around the FDNPP port. High levels of 131I were measured in fish in April 2011, but as this has a short radioactive half-life, it is now below detection levels. Generally, with the exception of species close to the FDNPP, there seem to be little long-term measurable effects on marine life.</li>
 	<li>Risk to Humans. The radiation risk to human life is comparatively modest in comparison to the 15,000 lives were lost as a result to the Tohoku earthquake and tsunami. So far, there have been no direct radiation deaths. The most exposed FDNPP evacuees received a total dose of 70 mSv, which (if they are representative of the general population) would increase their lifetime fatal cancer risk from 24% to 24.4%. However, there are still over 100,000 evacuees from the Fukushima area, and many industries such as fishing and tourism have been badly hit.</li>
</ul>
Lead author, Dr. Ken Buesseler (Woods Hole Oceanographic Institution, USA) said:

"This report pulls together much of the academic, industry and government studies to form a more complete picture of the amount of radioactivity released, its fate and transport in the ocean, whether we should be worried or not, and what can be predicted for the future. Overall, the results show a trend of decreasing radiation risk in oceans themselves and to marine life. This is generally true, except for the harbour at Fukushima NPP. The highest remaining oceanic contamination remains in seafloor sediments off coast of <a href="https://en.wikipedia.org/wiki/Japan">Japan</a>.

Despite this, we are still concerned that there is little support to continue assessments as time goes by, in particular from the US federal agencies which have not supported any ocean studies. This is not good, as public concern is ongoing, and we can learn a lot even when levels go down in the environment, and are no longer of immediate health concern".

Prof. Bernd Grambow, Director of SUBATECH laboratory, Nantes, France and leader of the research group on interfacial reaction field chemistry of the ASRC/JAEA, Tokai, Japan, commented: "This report is an excellent summary of the impact and the fate of the release of radioactive substances to the ocean. While the distribution and impact of <a href="http://www.earth.com/video/how-to-remove-radioactive-waste-from-water/">radioactive</a> material becomes clearer with time, a lot of work still needs to be done. Discharge flux rates of Cs-137 to the ocean continue to be in the range of some TBq/yr. Forest and soil bound Cs-137 is only slowly being washed away, with waste piles accumulating in many places

The evolution of transfer mechanisms and the flux of radioactive material through soils, plants and food chain from land to ocean are still insufficiently understood and still deserve close attention of the international scientific community."

Fukushima disaster and the oceans: What do we know, 5 years on?

Fukushima disaster and the oceans: What do we know, 5...

Ocean circulation slowed with every cooling during last ice age

Ocean circulation may cause abrupt climate changes. There was a period during the last ice age when temperatures in the Northern Hemisphere went on a rollercoaster ride, plummeting and then rising again every 1,500 years or so. Those abrupt climate changes wreaked havoc on ecosystems, but their cause has been something of a mystery. New evidence published this week in the leading journal Science shows for the first time that the ocean's overturning circulation slowed during every one of those temperature plunges - at times almost stopping.

"People have long supposed this link between overturning circulation and these abrupt climate events. This evidence implicates the ocean," said L. Gene Henry, the lead author of the study and a graduate student at Columbia University's Lamont-Doherty <a href="https://en.wikipedia.org/wiki/Earth">Earth</a> Observatory.

The impact of changes in the ocean overturning circulation on climate has become a hot topic today as global temperatures rise and melting sea ice and glaciers add freshwater to the North Atlantic. A 2015 study suggested that cooling in the <a href="http://www.earth.com/image/phytoplankton-blooms-persist-in-the-north-atlantic-ocean/">North Atlantic</a> may be due to a reduction in the overturning circulation, while a 2016 study suggested there had not been enough freshwater to have an effect.

The new study explores what happened to ocean circulation when the earth went through a series of abrupt climate changes in the past during a time when ice covered part of North America and temperatures were much colder than today. It looks at the Atlantic meridional overturning circulation, which distributes heat as it moves warmer surface water from the tropics toward Greenland and the high northern latitudes and carries colder, deeper water from the North Atlantic southward.

Using chemical tracers in sediment that builds up on the sea floor over time, Henry and his coauthors were able to document the relative speed of the Atlantic meridional overturning circulation during each abrupt climate change during the last ice age.

The chemical tracers show that the speed of the ocean overturning circulation changed first, and that sea surface temperature changed a while later. That suggests that cooling may start with changes in the ocean circulation, influencing the northern sea surface and atmosphere, said co-author Jerry McManus, a professor at Lamont-Doherty Earth Observatory. Evidence from ice cores and deep-sea sediment has shown that the northern climate also cooled before the southern climate during these abrupt changes, creating a "bipolar seesaw," with the north cool while the south was warm, and the south cooling as the north warmed.

The scientists stress that more work is needed to determine whether changes in ocean circulation initiated the abrupt climate changes or were an intermediary effect initially triggered by something else. "Our study supports the view that changes in ocean circulation were at least in part responsible for causing abrupt climate changes. However, what in turn caused those changes in circulation remains a mystery," Henry said.

Also unclear is why these abrupt climate shifts, also seen in previous ice ages, haven't happened in the past 10,000 years. The instability appears to occur only in certain temperature ranges, and when there is a large amount of land ice that could contribute freshwater.

"We would all like to understand better how the earth's climate operates," McManus said. "This demonstrates the crucial role that global circulation can play. The dynamics of the deep ocean directly influence the earth's climate."

The series of abrupt climate changes studied here occurred between 60,000 and 25,000 years ago, ending as the last ice age peaked. Each followed a general pattern in the Northern Hemisphere: The cooling happening over hundreds to 1,000 years, then the frigid temperatures persisted for a few hundred years in what is known as a stadial, McManus said. Once warming started, it happened very rapidly, with a rise of 3 to 6 degrees Celsius in average sea surface temperature and larger changes over Greenland within a span of decades.

During every cold northern stadial, the overturning circulation had slowed, so it wasn't bringing as much heat northward from the tropics and Southern Hemisphere, the study shows. The chemical tracers also suggest that circulation slowed almost to a halt during certain stadials known as Heinrich events, when massive amounts of icebergs broke off and drifted away from the Laurentide ice sheet, which covered a large part of North America at the time. Icebergs carry freshwater that can affect ocean circulation, and computer models have suggested that adding that much freshwater to the Atlantic could shut down circulation. Exactly what influence the icebergs had during these periods will be the target of future research.

To determine how ocean circulation changed, the scientists measured three types of chemical tracers. By comparing the ratio of protactinium-231 to thorium-230, two daughter isotopes of uranium decay that remain in seawater for relatively short but consistently different periods of time before drifting into the seafloor, they could determine when circulation was strongest. Another isotope, carbon-13, captured in tiny shells, is more common in North Atlantic waters than in southern waters. When circulation was strong, protactinium was low and carbon 13 was high, because more protactinium was carried away by the current and more northern waters formed.

Axel Timmermann, a professor of oceanography at the University of Hawaii who studies abrupt climate changes and was not involved in this study, called it a "breakthrough analysis."

"Large changes in the North Atlantic meridional overturning circulation are thought to have played a major role in generating millennial-scale global variability, known as Dansgaard-Oechger events, during the last glacial period. The paper by Henry, McManus and colleagues finally provides supporting evidence for this fundamental scientific hypothesis," Timmermann said.
###
The other coauthors of the paper are Bill Curry of Woods Hole Oceanographic Institution and the Bermuda Institute of Ocean Sciences; Natalie Roberts and Alex Piotrowski of the University of Cambridge; and Lloyd Keigwin of Woods Hole. The research was funded by the National Science Foundation, the Comer Science and Education Foundation, and the Lamont-Doherty Earth Observatory Climate Center.

The paper, "North Atlantic ocean circulation and abrupt climate change during the last glaciation," is available from the authors or from Science: 202-326-6440 or <a href="mailto:scipak@aaas.org">scipak@aaas.org</a>.

Ocean circulation may cause abrupt climate changes

Ocean circulation slowed with every cooling during last ice age...

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<div class="img-wrapper"></div>
A variety of normally harmless bacteria can cause bleaching disease in seaweeds when the seaweeds become stressed by high water temperatures, <a href="https://en.wikipedia.org/wiki/NASA">UNSW</a> Australia researchers have discovered.

Seaweeds are the "trees" of the ocean, providing vital habitat, food and shelter for many species of fish and other coastal marine <a href="http://www.earth.com/video/tiny-marine-organisms-may-affect-ocean-mixing/">organism</a>, such as crayfish and abalone.

"A lot of attention has been paid to coral bleaching, but seaweeds are also affected by temperature-related diseases," says study senior author UNSW's Dr Suhelen Egan.

"In most cases, the infectious agents that cause the diseases are unknown. Improving our understanding these disease processes is not only important for maintaining a healthy marine environment; it also has economic significance, given that seaweeds are increasingly being cultivated as sources of food and feed-stock for biofuels."

The study, by Dr Egan's team at the UNSW Centre of Marine Bio-Innovation, is published in the journal Environmental Microbiology.

The researchers collected samples of healthy and diseased red alga, Delisea pulchra, from about 8 metres under the water at different locations on the Sydney coastline. The diseased seaweeds had undergone natural bleaching, in which areas of pigment are lost.

"Bleaching reduces the ability of the seaweed to photosynthesise and harvest energy from the sun, and to reproduce. It also makes them more susceptible to grazing by fish and other herbivores in the ocean," says Dr Egan.

The researchers isolated microbes that were in greater abundance on the diseased seaweeds and cultured them. They then tested the ability of these microbes to cause bleaching disease in seaweeds in the laboratory.

"We were surprised to identify three very different kinds of bacteria which are usually present in low numbers on seaweeds, but which we now know can all cause the same bleaching disease," says Dr Egan.

"We also found that the usual balance of microbes was disturbed on the diseased seaweeds, with a lower diversity of microbes present than normal.

"We believe these kinds of opportunistic pathogens are more common in marine environment than had been realised before. They seize the chance to cause disease when the host is stressed, in the same way that normally harmless, common bacteria can cause disease in people who have weakened immune systems."

The three newly identified pathogens that cause the bleaching disease are members of the Alteromonas, Aquimarina and Agarivorans genera.
###
Media contact:

Dr Suhelen Egan
612-9385-8569
<a href="mailto:s.egan@unsw.edu.au">s.egan@unsw.edu.au</a>

UNSW Science media f officer
Deborah Smith
61-478-492-060
<a href="mailto:deborah.smith@unsw.edu.au">deborah.smith@unsw.edu.au</a>

</div>

Bacteria can cause bleaching disease in seaweeds

A variety of normally harmless bacteria can cause bleaching disease...

Toxic algae bloom invades Florida beaches. As a noxious algae bloom fouls beaches on Florida's Atlantic coast, the <a href="https://www.bing.com/search?q=u.s.+army+corps&amp;form=EDGEAR&amp;qs=PF&amp;cvid=01079f54837c4b47b2d838da065cf3b2&amp;cc=US&amp;setlang=en-US&amp;elv=AY3%21uAY7tbNNZGZ2yiGNjfNohb9CLHhC*AbSHwHQGaD3uTGsfYh*E0fmbM16UjamUs*m18FNrgGG*yBvlQDu7iG5vyVv*mQsglpf7zANuVx0&amp;plvar=0&amp;PC=HCTS">U.S. Army Corps</a> of Engineers is preparing to reduce the flow of water from Lake Okeechobee that many blame for fueling the problem.
The Corps' Jacksonville District planned to begin the reductions Friday, targeting the Caloosahatchee Estuary and the St. Lucie Estuary, a news release said. Toxic algae bloom invades Florida beaches
The action comes after Florida Gov. Rick Scott declared a state of emergency over the problem, and as politicians and residents are blaming the federal government.
Multiple Florida lawmakers have asked federal authorities that oversee Lake Okeechobee to immediately stop freshwater releases that coastal communities blame for algae blooms and other environmental damage.
"I would describe them as guacamole-thick. And it stinks," said Gabriella Ferraro, spokeswoman for Martin County.
<a href="http://www.earth.com/image/striking-antisolar-rays-over-florida/">Florida</a>'s U.S. senators, Republican Marco Rubio and Democrat Bill Nelson, have joined Martin County commissioners in calling for the Army Corps of Engineers to stop the flow of water between the river and Lake Okeechobee. Residents and business owners blame the algae on pollutants streaming from the lake.
After touring the St. Lucie River as it passes through downtown Stuart, Nelson said the problems can be traced to Florida's history of diverting water to the ocean.
"We need to repair 75 years of diking and draining, but that takes time," he said. He called on Florida's Legislature to spend money approved by state voters for environmental projects such as purchasing land around Lake Okeechobee for water storage instead of diverting the funds to pay for administrative costs.
Rubio is scheduled to visit the area Friday.
<img class="alignleft size-thumbnail wp-image-2400905" src="http://cff1.greenatom.net/uploads/2016/07/01101101/algae-bloom-florida-june2016_1big_ap-150x150.jpg" alt="algae-bloom-florida-june2016_1big_ap" width="150" height="150" />The blue-green algae is the latest contaminant featured in yearslong arguments over water flowing from Lake Okeechobee, which is critical to South Florida's water supply and flood control systems.
At Central Marine boat docks in Stuart, pea-green and brown algae coated the water Thursday and smelled strongly like cow manure. Blooms that started last week in the St. Lucie River continue to spread, threatening Atlantic beaches expecting crowds of families for the holiday weekend.
Sarah Chaney, a receptionist at Central Marine, said boaters and fisherman are cancelling reservations after seeing reports of the algae, which she called "horrible and disgusting."
When Scott declared a state emergency for the area Wednesday, he blamed the federal government for neglecting repairs to the lake's aging dike that's considered one of the country's most at-risk for imminent failure. On Thursday, he amended the emergency declaration, adding Lee and Palm Beach counties to Wednesday's emergency declaration for Martin and St. Lucie counties. Palm Beach County is located directly south of the existing emergency area, while Lee County is located on Florida's Gulf coast.
Some residents blamed Scott instead Thursday. He hasn't done enough to curb pollution from farms north of the lake or purchase land farther south where lake waters could be stored and cleaned, said Irene Gomes, owner of the Driftwood Motel in Jensen Beach.
The algae has rapidly grown from a beach nuisance to a health concern, as one customer made plans to leave early if the algae triggered breathing issues, said Gomes, whose family has owned the motel's turquoise-colored cabins since 1958.
"At one point, I could say to my customers, 'Come down, it's not at all the beaches,' because it wasn't toxic. Now we're talking about health issues," Gomes said.
Chaney, the Central Marine receptionist, said Scott should visit the area, even if he gets criticized.
"He needs to come see it himself and stop being a coward," she said.
Scott said in a news release Thursday that the Florida Department of Economic Opportunity will immediately activate a virtual business emergency operations center to assess businesses impacted by the blooms. The program will begin to survey businesses affected by the water releases and share the results with various state and local agencies to implement appropriate disaster relief programs.
Lake Okeechobee is the largest in Florida and the second largest body of freshwater in the contiguous United States. Flooding there after a major hurricane in 1928 killed at least 2,500 people in surrounding communities of mostly poor, black farmworkers. It inspired the storm central to Zora Neale Hurston's novel "Their Eyes Were Watching God."
To reduce the risk of a breach in the dike built after that hurricane, the Corps of Engineers tries to keep lake water levels between 12.5 feet and 15.5 feet above sea level. Shoring up the dike will take years. Meanwhile, freshwater is released east and west of the lake into the Caloosahatchee and St. Lucie rivers.
State water managers have said local stormwater runoff and septic tanks also fuel algae blooms. They're working to direct more water south of Lake Okeechobee into the parched Everglades, but federal regulations, conservation mandates and stalled restoration projects complicate those efforts.
In neighboring St. Lucie County, home to the troubled Indian River Lagoon, officials have prohibited homeowners from using fertilizer during the summer and begun working with the state to test waterways for pollution that might be linked to septic tanks.
Murky waters on southwest Florida's Gulf Coast also are blamed on the lake's discharges. Fort Myers-area lawmakers said Thursday that Scott should extend the state of emergency to Lee County because of water issues in the Caloosahatchee River.
---
Kay reported from Miami.
---
Follow Terry Spencer on Twitter at <a href="https://twitter.com/terryspen">https://twitter.com/terryspen</a> . His work can be found at <a href="http://bigstory.ap.org/author/terry-spencer">http://bigstory.ap.org/author/terry-spencer</a> .
---
This story has been corrected to show the name of the Martin County spokeswoman is Gabriella Ferraro, not Ferrero.
© 2016 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.

Toxic algae bloom invades Florida beaches

Toxic algae bloom invades Florida beaches. As a noxious algae...

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Scientists: Environmental toxins hurt brain development. An unprecedented alliance of leading scientists, medical experts, and children's health advocates argue that today's scientific evidence supports a link between exposures to environmental <a href="https://www.earth.com/news/high-levels-of-toxins-found-in-stranded-whales-and-dolphins/">toxins</a> in air, food, and everyday products and children's risks for neurodevelopmental disorders. The alliance, known as Project TENDR, which stands for "Targeting Environmental Neuro-Developmental Risks," is calling for immediate action to significantly reduce exposures to toxic chemicals to protect brain development.

Among the signatories to the TENDR statement published online in Environmental Health Perspectives are Frederica Perera, professor and director of the Columbia Center for Children's Environmental Health, and Virginia Rauh, professor of Population and Family Health, both faculty at Columbia University's Mailman School of Public Health. Scientists: Environmental toxins hurt brain development

"There is overwhelming scientific evidence that early-life exposure to neurotoxic chemicals is contributing to a host of developmental problems in children," says Perera, a professor of Environmental Health Sciences. "Exposure to these <a href="https://www.bing.com/search?q=chemicals&amp;cvid=c9b0b768100249a8a327d9b6b43d9526&amp;FORM=ANAB01&amp;PC=HCTS">chemicals</a> is pervasive, warranting action now to reduce their production and use."

Neurodevelopmental disorders linked to certain environmental exposures include intellectual disability, autism spectrum disorder, attention deficits, hyperactivity, and learning disabilities.

Prime examples of the chemicals and pollutants that are contributing to children's learning, intellectual and behavioral impairment include:
<ul>
 	<li>Organophosphate (OP) pesticides</li>
 	<li>Polybrominated diphenyl ether (PBDE) flame retardants</li>
 	<li>Combustion-related air pollutants, which generally include polycyclic aromatic hydrocarbons (PAHs), nitrogen dioxide and particulate matter</li>
 	<li>Lead</li>
 	<li>Mercury</li>
 	<li>Polychlorinated Biphenyls (PCBs)</li>
</ul>
TENDR signatories call on government to remove these toxic chemicals from food and consumer products so that pregnant women and children are not exposed. In addition, they call on regulators to follow scientific guidance for assessing how chemicals affect brain development, such as taking into account the special vulnerabilities of the developing fetus and children, all sources of exposure to neurotoxic chemicals, and the lack of a safety threshold for many of these chemicals. Among action items, they call on businesses to eliminate chemicals harmful to brain development from their supply chains and products.

Project TENDR, which stands for "Targeting Environmental Neuro-Developmental Risks," is an alliance of 48 of the nation's top scientists, health professionals and health advocates. TENDR participants have come together across many disciplines and sectors, including epidemiology, toxicology, exposure science, pediatrics, obstetrics and gynecology, nursing, public health, and federal and state chemical policy. Medical and scientific societies that have signed on in support include American Congress of Obstetricians and Gynecologists, Endocrine Society, National Medical Association, National Hispanic Medical Association and the National Council of Asian Pacific Island Physicians. TENDR's long-term mission is to lower the incidence of neurodevelopmental disorders by reducing exposure levels to chemicals and pollutants that can contribute to these conditions, especially during fetal development and early childhood. Project TENDR is a joint endeavor of the Learning Disabilities Association of America (LDA) and the University of California Davis MIND Institute (Medical Investigations of Neurodevelopmental Disorders).


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Scientists: Environmental toxins hurt brain development

Scientists: Environmental toxins hurt brain development. An unprecedented alliance of...

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NASA scans powerful Typhoon Nepartak. NASA's Aqua satellite passed over Typhoon Nepartak after it became a major typhoon in the Northwestern Pacific Ocean.

The second tropical cyclone of the northwestern Pacific Ocean season formed on July 3 and strengthened quickly into a tropical storm that was named Nepartak.

On July 5 at 0359 UTC (11:59 p.m. EDT) infrared data from the Atmospheric Infrared Sounder aboard NASA's Aqua satellite detected strong thunderstorms completely surrounding the center of Nepartak with temperatures colder than minus 63 degrees Celsius (minus 81 Fahrenheit). Temperatures that cold indicate very powerful thunderstorms with cloud tops high into the troposphere. Bands of powerful thunderstorms wrapped into the low-level center of circulation from the northwest and southeast.NASA scans powerful Typhoon Nepartak

On July 5 at 1500 UTC (11 a.m. EDT) Nepartak's maximum sustained winds were near 120 knots (138 mph/222 kph). Nepartak is currently a category 4 hurricane on the Saffir-Simpson Scale, making it a major hurricane/typhoon. It was centered near 17.6 degrees north latitude and 132.7 degrees east longitude, about 821 nautical miles east-southeast of Taipei, Taiwan. Nepartak is moving to the west-northwest at 18 knots (20.7 mph/33.3 kph). <a href="https://www.earth.com/video/nasa-telescope-will-capture-millions-of-galaxies/">NASA's</a> Aqua satellite passed over Typhoon Nepartak after it became a major typhoon in the Northwestern Pacific Ocean.

The Joint Typhoon Warning Center noted that "passage over very warm water, low vertical wind shear, and favorable outflow enhanced by an upper-level trough to the northwest are supporting the rapid intensification trend."

Nepartak is forecast to move northwest and is expected to intensify to 125 knots (143 mph/231 kph) over the next two days. The Joint Typhoon Warning Center forecast calls for the tropical cyclone to cross over northern and then over far eastern China before reemerging into the Yellow Sea.


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NASA scans powerful Typhoon Nepartak

NASA scans powerful Typhoon Nepartak. NASA's Aqua satellite passed over...

First 6 months of 2016 were hottest ever in New Zealand. Ski fields are struggling to open and winter electricity consumption is down in New Zealand after the first six months of 2016 proved to be the hottest start to a year that scientists have ever recorded.
Temperatures in the <a href="https://www.earth.com/image/noumea-in-the-south-pacific-archipelago-of-new-caledonia/">South Pacific</a> nation were 1.4 degrees Celsius (2.5 Fahrenheit) above the long-term average for the first half of the year, according to the government-funded National Institute of Water and Atmospheric Research.
That's the highest since record-keeping began more than a century ago, and significantly higher than the previous record of 1.1 Celsius above average, reached in 1938 and again in 1999. First 6 months of 2016 were hottest ever in New Zealand
Chris Brandolino, a scientist at the research agency, said Monday that ocean temperatures in the Tasman Sea to the west of New Zealand have been unusually warm this year and that warmer winds from the north have also predominated.
"What's happened in the background is that the Earth has continued to warm as greenhouse gas levels have risen," he said.
The agency reported that carbon dioxide levels recorded at a station near Wellington passed 400 parts per million in June for the first time. The threshold is seen as significant internationally as an indicator of climate change.
While many New Zealanders reveled in a summer that never seemed to end, commercial ski fields including Coronet Peak, Mount Hutt and Turoa have found themselves with little snow, electing to delay opening or operating with limited runs as the Southern Hemisphere winter gets underway.
Brandolino said the rise in average temperatures doesn't necessarily mean the ski season will be bad, "although if I'm a skier or snow enthusiast, record warm temperatures aren't going to bode well for me."
Transpower, the government agency which owns the national electricity grid, provided figures to The Associated Press showing that New Zealanders consumed about 2 percent less electricity in June than they did during the same month a year earlier, likely due in part to lower heating requirements.
The Transpower figures showed a June drop of 8 percent in Wellington and 7 percent in Christchurch compared with a year earlier. Those cities are typically cooler in winter than the largest city, Auckland, where the drop was 2 percent.
The June month was the third-hottest June ever recorded in New Zealand and the hottest ever recorded in Christchurch, according to the research agency.
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First 6 months of 2016 were hottest ever in New Zealand

First 6 months of 2016 were hottest ever in New...

EOMAP: Developing new methods to detect coral bleaching events. The EOMAP aquatic remote sensing company, together with partners at the Remote Sensing Research Centre of Queensland University and the Great Barrier Reef Foundation, are developing new methods to monitor and detect coral bleaching events using Europe’s Sentinel-2A satellite.

The Great Barrier Reef is suffering dramatic levels of coral bleaching over large areas of the northern reefs. EOMAP: Developing new methods to detect coral bleaching events

In order to assess the extent of a bleaching event, scientists and managers often resort to surveys from aircraft, followed by targeted dive surveys. With the <a href="http://www.earth.com/news/brutal-coral-bleaching-event-strikes-the-great-barrier-reef/">Reef</a> being approximately the size of Italy, this is a costly and time-consuming procedure, particularly when repeat surveys are required.

Today, Sentinel-2A provides the required spatial and temporal resolution for detecting and monitoring coral bleaching (of a certain magnitude in area and duration) at Reef-wide scales.

<a href="https://en.wikipedia.org/wiki/NASA">EOMAP</a> and partners believe they have the right algorithms to best exploit these new data sources.

Dr Petra Lundgren, Science Manager at the Great Barrier Reef Foundation, comments, “Given the Great Barrier Reef’s vast size, and the scale of the threats it faces, there is an urgent need to develop new, cost-effective monitoring technologies that will improve the spatial and temporal scope of observation data.”

Australian and German teams are testing this methodology over an area of the Reef where, based on recent aerial surveys, bleaching is occurring. The premise is relatively simple: compare Sentinel-2A images taken before and during coral bleaching.

[caption id="attachment_2401026" align="alignleft" width="150"]<img class="size-thumbnail wp-image-2401026" src="http://cff1.greenatom.net/uploads/2016/07/01174308/coral-bleaching-from-space_1big_sentinel-2_esa-150x150.jpg" alt="An example of the seafloor reflectance product " width="150" height="150" /> An example of the seafloor reflectance product[/caption]

However, such satellite image comparisons are not straightforward, particularly where water-covered targets are concerned. Variations in viewing and illumination geometries, atmospheric conditions, water column optical properties, sea surface roughness, tides and water depth all add to the difficulties.

Dr Magnus Wettle, Managing Director of EOMAP Australia, explains: “These variations, between images taken, say, 1–2 months apart, can distort the measured signal to the point where it significantly affects the perceived differences in the image data; errors of omission and commission are both likely.

“We can get around this by using our proprietary Seafloor Reflectance product.”

Calculated using physics-based algorithms, the EOMAP seafloor reflectance is the theoretical true colour of the seafloor, as if the overlying water column were removed and the viewer were standing on the seafloor.

In other words, the perceived colour of the seafloor is normalised for atmospheric and aquatic optical effects, and seafloor colour can therefore be accurately compared between images taken at different dates, from different sensors, and under varying environmental conditions.

“The areas that are shown in the maps as potentially bleached make sense based on our interpretation of aerial and field observations, as well as our understanding of the coral bleaching process,” says Dr Chris Roelfsema, Co-Director of the Remote Sensing Research Centre at the University of Queensland.

“These results are very promising and will provide a step forward in combining field and satellite methods for monitoring bleaching for large areas such as the Great Barrier Reef.”

The next important step is to incorporate additional, accurate field survey data, acquired over the period during which the corals are bleached, in order to further validate these outputs.

Australian agencies working on the Reef have now collected field survey data, which could be used towards validating this approach.

Once proven, the approach can be deployed across larger, regional scale areas of the Reef, both for mapping and future monitoring purposes.

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<a href="http://www.esa.int" target="_blank" rel="noopener noreferrer">European Space Agency</a>

EOMAP: Developing new methods to detect coral bleaching events

EOMAP: Developing new methods to detect coral bleaching events. The...

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Hurricane Blas: NASA analyzes first hurricane of the Eastern Pacific season. The second named tropical cyclone of the Eastern Pacific Ocean hurricane season has become hurricane Blas. NASA analyzed Blas in infrared light on July 5 and saw powerful thunderstorms with very cold cloud top temperatures after it reached hurricane status. Earlier, NASA's RapidScat instrument analyzed surface winds as the storm was strengthening from a depression to a tropical storm.

The tropical depression that grew to become Tropical Storm Blas formed at 11 p.m. (0300 UTC) on Saturday, July 2. At that time the center of<a href="https://www.earth.com/news/nasa-catches-tropical-depression-sarika039s-landfall/"> Tropical Depression</a> Three-E was near latitude 11.1 north and longitude 108.3 west. By 5 a.m. EDT on July 3 the depression strengthened into a tropical storm.

On July 3, the RapidScat instrument that flies aboard the International Space Station saw surface winds east of Blas' center near 21 meters per second (46.9 mph/75.6 kph). RapidScat is an important tool for meteorologists, because maximum sustained winds are not always equally distributed in a storm. Hurricane Blas: NASA analyzes first hurricane of the Eastern <a href="https://www.bing.com/search?q=pacific&amp;cvid=48a4b994995f4fb39e182bc8cec44e27&amp;FORM=ANAB01&amp;PC=HCTS">Pacific</a> season shows forecasters the location of the strongest winds in different quadrants of a storm, indicating locations facing greatest impacts.

By July 5, Blas had become the first hurricane of the Eastern Pacific hurricane season. At 5 a.m. EDT (0900 UTC) Maximum sustained winds have increased to near 100 mph (155 kph) with higher gusts.

The center of Hurricane Blas was located near latitude 14.2 North, longitude 118.1 West. That's about 805 miles (1,295 km) southwest of the southern tip of Baja California. Blas is far from land, so there are no coastal watches or warnings in effect.

Blas was moving toward the west-northwest near 14 mph (22 kph), and a motion toward the west-northwest or west is expected for the next couple of days. The estimated minimum central pressure is 978 millibars.

On July 5 at 0941 UTC (5:41 a.m. EDT) infrared data from the Atmospheric Infrared Sounder aboard NASA's Aqua satellite detected strong thunderstorms completely surrounding the center with temperatures colder than minus 75 degrees Celsius (minus 103 Fahrenheit). That indicates very powerful thunderstorms with cloud tops high into the troposphere. Infrared data also suggests a ragged eye has developed.

Visible satellite data shows that the overall convective cloud pattern has also become more symmetrical.

The National Hurricane Center (NHC) said that additional strengthening is expected, and Blas is forecast to become a major hurricane later today, July 5. NHC noted that in two days, Blas will be moving over cooler waters that will put the storm on a weakening trend. For updates, visit: <a href="http://www.nhc.noaa.gov/" target="_blank" rel="noopener">http://www.nhc.noaa.gov</a>.


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Hurricane Blas: NASA analyzes first hurricane of the Eastern

Hurricane Blas: NASA analyzes first hurricane of the Eastern Pacific...

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The first named tropical storm of the Eastern <a href="http://www.earth.com/news/pacific-salmon-water-temperatures/">Pacific</a> Hurricane Season formed over the July 4th holiday weekend and by July 6 had weakened to a remnant low pressure area. NASA's Terra satellite captured a visible light image of tropical storm Agatha before the storm's big fireworks finale fizzled.

Agatha, which started out as Tropical Depression 2-E formed Friday, July 1 at 11 p.m. EDT. By 11 a.m. PDT (1500 UTC) on July 2, the depression strengthened into a tropical storm about 775 miles (1,245 km) southwest of the southern tip of Baja California, <a href="https://en.wikipedia.org/wiki/Mexico">Mexico</a>.

As Agatha neared peak intensity, NASA's Terra satellite flew overhead on July 3.The MODIS (Moderate Resolution Imaging Spectroradiometer) instrument aboard NASA's Terra satellite captured a visible image of Agatha on July 3, 2016 when the storm's maximum sustained winds were near 45 mph (75 kph).The image showed strongest thunderstorms on the eastern side of the storm with a band of storms wrapping into the low-level center of circulation from the northwest.

At 11 p.m. EDT (0300 UTC), on July 4, Agatha became a remnant low pressure area. The center of Post-Tropical Cyclone Agatha was located near latitude 19.3 North, longitude 130.4 West. That's about 1,345 miles (2,160 km) west of the southern tip of Baja California, Mexico. The post-tropical cyclone was moving toward the west near 12 mph (19 kph). Maximum sustained winds are near 35 mph (55 kph) and weakening.

By July 5 at 0300 UTC (July 4 at 11 p.m. EDT) Agatha's remnants were located near 19.3 degrees north latitude and 130.4 degrees west longitude. Agatha continued to move west and is expected to dissipate like fading fireworks in a day or two.


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Tropical Storm Agatha fizzles out

The first named tropical storm of the Eastern Pacific Hurricane...

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Understanding forest fire history can help keep forests healthy. For nearly a century, forest fires have been viewed by scientists and the public as dangerous and environmentally damaging disasters. However, recent research has shown that forest fires are vital to maintaining healthy forests. While people in the western portions of the U.S. experience forest fires often and know of their value, many people on the eastern side of the U.S. do not know of their importance. In a new study, University of <a href="https://en.wikipedia.org/wiki/Missouri">Missouri</a> researchers have studied tree rings throughout <a href="http://www.earth.com/news/explosive-wildfires-western-oklahoma/">Oklahoma</a> and Tennessee to determine the history of fires in those areas.

Michael Stambaugh, assistant research professor in the MU College of Agriculture, Food and Natural Resources, says understanding this history is important for managing and improving the ecology of forests in the future.

"Many forest ecosystems are fire-dependent, meaning that in order to maintain their health and vibrancy, they must be subjected to fire on a regular basis," said Stambaugh, who is a member of the Missouri Tree-Ring Laboratory at MU. "By understanding how fire has maintained forest ecosystems in the past, we can determine the best ways to use fire to maintain those forests in the future."

To study the history of fire in Oklahoma and Tennessee, Stambaugh examined tree rings from 332 trees in eight different sites throughout both states. Stambaugh found 843 different fire scars embedded within the tree rings and was able to determine when and how often each site experienced forest fires over the last 300 years. He found that despite having a wetter, cooler climate, forests in Tennessee experienced higher fire frequency than Oklahoma. He also found that fires existed in those areas long before Euro-American settlement, showing that fire has been important to those forests for centuries.

"The history of fire in America also is the history of humans on this continent," Stambaugh said. "Humans have been here for more than 12,000 years and everywhere we see humans move, we see fires follow or be altered. This has been a constant for so long that forest ecology has become dependent on these fires, if they already weren't before humans arrived. However, many parts of the U.S., especially in the eastern half of the continent, have not experienced forest fires in more than 150 years because humans have worked hard to prevent those fires. Many of those forests are now suffering because of the lack of fire to help renew the ecology."

In order to understand the effects of fire around the U.S., Stambaugh and his fellow MU researchers are cataloging the history of fire by studying tree rings from trees throughout the entire country.
###
The study, "Scale Dependence of Oak Woodland Historical Fire Intervals: Contrasting the Barrens of Tennessee and Cross Timbers of Oklahoma, USA," was published in Fire Ecology. The study was coauthored by MU Associate Professor Richard Guyette along with Joseph Marschall and Daniel Dey of the USDA Forest Service Northern Research Station located at MU.

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Understanding forest fire history can help keep forests healthy

Understanding forest fire history can help keep forests healthy. For...

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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

[sendtonews key="G9bUoxcjr4-2511624-12187" type="single"] Today's Video of the Day from the...

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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

[sendtonews key="LvS8v8bp9z-2564889-12187" type="single"] Today's Video of the Day from the...

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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



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.

Designing crops that can beat the heat

[sendtonews key="QGPzYnXEtN-1712599-12187" type="single"] Today’s Video of the Day from Carl...

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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



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.

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

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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



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.

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



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.

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



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.

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



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.

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



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.

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



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.

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



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.

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



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.

2022 illustrated the consequences of a warming climate

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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



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.

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



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.

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



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.

Tiger sharks are shifting poleward as temperatures rise

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