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Tag: "algal" at biology news

Oceans more vulnerable to agricultural runoff than previously thought, study finds

...nce linking large-scale coastal farming to massive algal blooms in the sea. Writing in the March 10 issue ...h of microscopic algae called phytoplankton. These algal blooms are natural events that benefit life in the gulf by generating tons of phytoplankton-a major ...

Man-made wetland's effectiveness similar to natural marsh

...y of water and cause excessive growth of algae and algal blooms. These blooms thrive on the nutrients and deplete the water of nearly all of its oxygen. Wetlands experts estimate that the American Midwest has lost about 80 percent of its wetlands in the last two centuries, compared to a 50 percent loss ov...

Scientists find viruses can't stick to sea bugs in the dark

...ges may be an important weapon against problematic algal blooms. On hot, sunny days algae can cause massive, toxic blooms, poisoning huge areas of the sea with their waste products and killing fish, sea mammals such as whales, dolphins and seals, and even humans. Control of these blooms is vital to the hea...

'Sinkers' provide missing piece in deep-sea puzzle

...river plumes. Other scientists have suggested that algal blooms or the sunken carcasses of whales and other large animals could account for the missing food. Robison believes that, although these sources may be important in some areas, they are not persistent enough or substantial enough to account for wha...

Microbe has huge role in ocean life, carbon cycle

...rganic carbon - producing the nutrients needed for algal growth. "Ultimately, SAR11 through its sheer abundance plays a major role in the Earth's carbon cycle," Giovannoni said. "Quite simply, this is something we need to know more about. SAR11 is a major consumer of the organic carbon in the oceans, whic...

Living with salt

...nd other unique structural features may enable the algal carbonic anhydrase to be active in the presence of salt, though not dependent on it. In a surprise twist, the researchers discovered that one other known carbonic anhydrase - found in mouse kidney - sported a similar, salt-tolerant construction. Pond...

Prenatal exposure to marine toxin causes lasting damage

...ans can become poisoned by the potentially lethal, algal toxin after eating contaminated shellfish. The researchers saw behavioral effects of the toxin in animals after prenatal exposure to domoic acid levels below those generally deemed safe for adults, said Edward Levin, Ph.D. Those effects -- includin...

Algal protein in worm neurons allows remote control of behavior by light

...ers took advantage of the light sensitivity of the algal channel protein by introducing expression of a modified form of ChR2 in specific C. elegans neurons and muscle cells. The researchers found that when this form of ChR2 was expressed in muscle cells, blue-light activation of the protein was sufficient...

Health of Acehnese reefs in the wake of the tsunami shows human impacts more harmful

...o destructive fishing had low coral cover and high algal cover, a change that the tsunami may exacerbate in bringing an influx of nutrients and sediments. However, the researchers found that there was no evidence to support the idea that healthy reefs reduced tsunami-induced damage on land. The authors con...

Marine mammals are on the frontline of failing ocean health

...natee die-offs are revealing new health impacts of algal blooms - for both manatees and humans. "Recent, ...ked to brevetoxins, compounds produced by specific algal blooms. Neurotoxic shellfish poisoning and other acute effects of consuming brevetoxins are not new...

Red Tide causes sea turtle die-off in El Salvador

...le mortality." The first reports of these deadly algal blooms came in November along El Salvador's southe...roducers, and occasionally human deaths. While the algal blooms are a natural occurrence, human wastes such as run-off containing fertilizers and sewage from...

High-tech tags on marine animals yield valuable data for biologists and oceanographers

... chlorophyll content of the water (an indicator of algal blooms or "primary productivity"). "We can now use animals to show us things like the thermal properties and cooling rates of the ocean and the structure of the water column, and they can often get valuable data that would be hard to collect by oth...

Too much sugar not good for coral reefs

...ound in fertilizers. Nitrogen and phosphates cause algal overgrowth on corals, which also contributes sugars to the system. It is vital to consider the carbon component as we develop conservation strategies for coral reefs." ...

'Prosthetic' retinal cells let blind mice see light

...l cortex could be interpreted as vision. Also, the algal protein is less sensitive to light than is the normal light-detecting protein in the eye. Finally, they wrote, it remains unclear which of the many inherited retinal diseases might be treatable by using the technique. "The remodeling of inner retina...

Brazil creates buffer zone around coral reefs off Atlantic coast

... ridges) and a complex of small islands, coral and algal reefs. Its natural resources directly support more than 100,000 people. Since 1996, CI-Brazil has conducted biological monitoring at Abrolhos National Marine Park, including assessments of the effects of oil and gas exploration and possible oil spil...

Pollution threatens coral health by preventing lesions from healing, UCF study shows

...er effluent, and it leads to poor coral growth and algal blooms. Coral samples in Fauth's project were analyzed at Haereticus Environmental Laboratory in Amherst, Va. "We're doing the same thing as a medical examiner," Fauth said. "It's possible that corals are being stressed by pollution, and we're ...

Arctic coring expedition continues to yield new clues

...ic plants are known to rapidly multiply and create algal blooms. Dickens said that fossils of these plants ?known only to originate in the tropics before the PETM ?are commonly seen in the ACEX cores. Furthermore, the chemistry of the organic carbon in the ACEX cores may rule out some earlier theories abou...

Global warming may have damaged coral reefs forever

... herbivorous fish is a key concern as they control algal spread. Researchers speculate that the reefs' inability to reseed is down to their relative isolation. A lack of nearby reefs to provide larvae which could settle and grow into new coral structures and the absence of favourable sea currents to tra...

Sandia research to focus on early detection of harmful algal blooms

...can successfully detect deadly toxins from harmful algal blooms (HABs). The funding is provided by the Coop...ating for coastal ecology and fisheries Harmful algal blooms are widely acknowledged to be a severe coastal resource management issue, adversely impacting...

Fish species plays surprise role in aiding coral reef recovery

...new study intentionally triggered a phase shift to algal dominance on a healthy reef. They then filmed the ...fs had any significant impact on its recovery from algal overgrowth. What was most surprising was that the dominant browser was a rare batfish, a species pre...

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