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Tag: "lakes" at biology news

Wild birds help to create human flu vaccine

...irds from the Gobi Desert to the northern mountain lakes of the country and collected samples from hundreds of wild birds, both live and dead including, ruddy shelduck, herring gull, black-headed gull, bar-headed goose, and whooper swans, all species that have been affected by the disease. "The collabo...

Sahara's edge studied from ground, air and space to improve water management

...00 years ago, there was savannah here with rivers, lakes and plentiful rains. That landscape has vanished now, but the rains from that period progressively percolated beneath the ground to be collected in layers of water-bearing rock known as aquifers. This 'fossil water' is today used in North African ...

Multiple genes permit closely related fish species to mix and match their color vision

...ndreds of new cichlid species have arisen in these lakes in the last 100,000 years. Thanks to the relatively recent colonization by these fish of different ecological niches, as well as the prominent role of nuptual coloring in the mating preferences of these species, the cichlids offer a unique opportunit...

Sudden change in social status triggers genetic response in male fish, study finds

... that inhabit Lake Tanganyika and other freshwater lakes in East Africa. Like all cichlids, A. burtoni lives in a hierarchical social system where showy dominant males defend small territories that are used for courtship and breeding. However, dominance among male cichlids is reversible: If a subordinate s...

Chernobyl: The true scale of the accident

...eter area surrounding the reactor, and some closed lakes and restricted forests, radiation levels have most...entrations of radiocaesium were found in fish from lakes as far away as Germany and Scandinavia. Comparable levels of radiostrontium, which concentrates in f...

Emerald Spectre haunts Ontario's ash forests

...he ash trees in a ten kilometre wide swath between lakes Erie and St. Clair, beyond the eastern boundary of the borer's current range. Regardless, the report notes, "the borers distribution expanded dramatically in 2004" primarily through natural dispersal, but in some cases through human transport. In On...

Freeze-dried mats of microbes awaken in Antarctic streambed

... intermittent streams that link glaciers to frozen lakes on the valley floor, she said. The streambeds contain photosynthetic microbes known as cyanobacteria, which collectively occur as thin, rubbery mat-like structures that can spread several meters across the streambed surface. The experiment began in ...

Disappearing arctic lakes linked to climate change

...irbanks, tracked changes of more than 10,000 large lakes over 200,000 square miles. "This is the first pap...nstrates that the changes we are seeing in Alaskan lakes in response to a warming climate is also occurring in Siberia," said Hinzman, who has also compared ...

Study shows eutrophic lakes may not recover for a millennium

...en just 60 years for humans to put many freshwater lakes on the eutrophication fast track, a new study show...hreatening. Sooner or later it is going to hit the lakes and it is going to pose problems." Eutrophication occurs when nutrient-rich soil washes into lakes ...

NASA probe could reveal comet life, scientists claim

...s daring again to predict that subsurface ponds or lakes form transiently due to heat penetrating the exterior crust. We can thus expect biology on comets to have similarities with antarctic biology," added Professor Wickramasinghe. ...

Internet viruses help ecologists control invasive species

...ing network theory, they built up a picture of the lakes as nodes in a network connected by human traffic, ...n hubs. According to Muirhead and MacIsaac: "Some lakes invaded by the spiny water flea may serve as invasion hubs if departing boaters and anglers travel t...

Man-made wetland's effectiveness similar to natural marsh

... Each spring, the rush of chemicals that runs into lakes and streams in the Mississippi watershed ?an area encompassing about 40 percent of the United States ?ultimately turn more than 7,000 square miles of the Gulf of Mexico into a "dead zone," a condition known as hypoxia. Hypoxia happens when excess nu...

Aggressive aquatic species invading Great Lakes

...d about the effects on native species in the other lakes that gobies have now spread to," says Balshine. ...

Reservoirs may accelerate the spread of invasive aquatic species, researchers say

...aimed at comparing rates of invasion in freshwater lakes and reservoirs that are in similar geographic regions, to determine whether the rate in reservoirs is indeed higher, as predicted. ...

Scientists discover how plants disarm the toxic effects of excessive sunlight

...phyll concentrations on land as well as in oceans, lakes and seas. This image provides a snapshot of photosynthetic capacity and significant sources of singlet oxygen, a toxic byproduct of photosynthesis, in the biosphere. See the image at: http://earthobservatory.nasa.gov/Observatory/Datasets/bios.seawifs...

Alaskan puzzles, monitoring provide insight about North Pacific salmon runs

... Still, 20 miles away from the Kvichak are similar lakes and rivers with record production. "Our research is directed toward understanding why these runs see such different trends, by looking broadly at different systems subject to the same climate factors and constructing ecosystem conditions going back ...

Family trees of ancient bacteria reveal evolutionary moves

...ng that Cyanobacteria emerged first in fresh water lakes or streams is counterintuitive. "Most people have the assumption that Cyanobacteria came out of a marine environment ?after all, they are still important to marine environments today, so they must always have been," Blank said. "When Cyanobacteria s...

Scientists discover unique microbe in California's largest lake

..., gradually becoming one of thelargest hypersaline lakes in the United States.Because it also receives the agricultural runoff of the Imperial Valleyand municipal runoff from Mexicali, Mexico, considerable attention hasfocused on the fate of the now highly polluted water body. Aftermassive fish kills and a...

Octopuses occasionally stroll around on two arms, UC Berkeley biologists report

...sticklebacks. Marine fish colonized new freshwater lakes and streams when the last ice age ended 10,000 to ...mored and fast," Kingsley said. "Now, in countless lakes and streams around the world these low-armored types have evolved over and over again. It's one of t...

Researchers trace evolution to relatively simple genetic changes

...sticklebacks. Marine fish colonized new freshwater lakes and streams when the last ice age ended 10,000 to ...mored and fast," Kingsley said. "Now, in countless lakes and streams around the world these low-armored types have evolved over and over again. It's one of t...

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