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Tag: "streams" at biology news

Researchers find 24 species believed new to science in Suriname rainforest

...t strategies should focus on protecting freshwater streams and preventing fragmentation of the natural habitat from unchecked or poorly planned development. The Guayana Shield region contains the largest undisturbed tropical rainforest on the planet, a northern Amazon tract three times larger than the U.S...

Climate change impacts stream life

Climate change is warming Welsh streams and rivers, affecting the number and variety of so...r Cardiff University study has found. Rivers and streams are key ecosystems for many aquatic species and form important links with surrounding habitats, yet ...

'Short-circuit' found in ocean circulation

...rent on the Pacific side of Cape Horn. It then streams through into the Atlantic with the current, but in the process is spread, shifted and diffused by the circulation. Measurements of this spreading of the helium were used to deduce the ‘short-circuit? ...

Mine runoff continues to provide clues to microbial diversification

... microbial community thriving in battery acid-like streams underground at Richmond Mine near Redding, Calif.,...red that Leptosprillium group II bacteria in these streams are exchanging large blocks of genes. While scientists have seen extensive gene transfer in bacteria...

Farmed salmon could become an invasive species in forest streams

...he short- and long-term risks to native species in streams on National Forests." Bisson, a staff scientist...mpact of farmed salmon on native fishes inhabiting streams on National Forest System lands and to learn if concerns from both sides of the farmed-versus-wild f...

Common gene version optimizes thinking -- but with a possible downside

...established that DARPP-32 in the striatum switches streams of information from multiple brain chemical systems for processing by the cortex. Both the neurotransmitter that it works through, dopamine, and the chromosomal site of its gene have been implicated in schizophrenia. "Although several groups have...

Bats prey on nocturnally migrating songbirds

... restricted parts of the Mediterranean where major streams of migrating birds congregate. Second, it is among the largest Palaeartic bats and even belongs to the heaviest aerial-hunting bats of the world. A large body mass (up to 50 g for 45 cm wingspan) is probably a prerequisite for subduing prey items as ...

Baby fish 'smell their way home'

...he team exposed tiny fish larvae in a tank to pure streams of water from four different reefs. To their amazement, within minutes a surprisingly high percentage of baby fish had congregated in the water flow from their home reef. "It was a lot more than you'd expect to happen by pure chance ?and it appli...

Study finds mercury prevalent in many western fish

...ntal Protection Agency of more than 600 rivers and streams in the western United States found widespread merc... for humans who may occasionally eat fish from the streams is fairly low and they compare the mercury levels in most of the larger piscivorous fish they analyz...

E. coli bacteria migrating between humans, chimps in Ugandan park

...humans working in the park. Both make use of local streams and other environmental features. Regardless of the route of transmission, it places both at risk, Goldberg said. "We’re as concerned about potential effects on human health as on animal health," he said. He noted that the exchange of micro...

Satellites shed light on global warming

...t seasons and the formation of extended melt water streams and ponds on the ice shelf surfaces," Rott said. The sections of Larsen-A, which disintegrated almost completely in January 1995, and Larsen-B that broke away were 200 to 350 metres thick. According to Rott, only 1403 square kilometres of Larsen-...

Immunization rates hit record high in poor countries

...fall. In cool hollows and along shady mountain streams the hemlock has grown for millennia where other tr... and the mountain fish depend on the trees to keep streams cool. "See all this white growth?" Costa says in his UVM lab, tracing his finger above the soft f...

Fungal factories may save hemlock forests

...fall. In cool hollows and along shady mountain streams the hemlock has grown for millennia where other tr... and the mountain fish depend on the trees to keep streams cool. "See all this white growth?" Costa says in his UVM lab, tracing his finger above the soft f...

Monitoring poisons in the environment -- a woolly matter

...avy metals. This was compared with data from local streams for accuracy....

Archerfish tune their shots to universal properties of prey adhesion

...mall terrestrial animals by firing precisely aimed streams of water that knock prey onto the water's surface....s. By employing high-resolution imaging of water streams fired during archerfish hunting, researchers have discovered that archerfish automatically tune the ...

From hot springs to rice farms, scientists reveal new insights into the secret lives of archaea

...owstone hot springs to the hyper-salty Dead Sea to streams polluted by mining waste where the pH level is equivalent to battery acid. Archaea even inhabit the warm, dark environs of our intestines and mouth. While extremophiles have been the subject of intense research, scientists are just now beginning t...

A fisheye view of the deadliest breast cancer

... transgenic zebrafish, a tropical minnow native to streams around the Bay of Bengal and common to aquariums around the world, which was chemically treated to be immune suppressed. In recent years, the zebrafish has vaulted to the top as a laboratory model organism. The zebrafish is tough, easy to breed, an...

How does a zebrafish grow a new tail?

... cells like themselves should be reproduced. These streams of signals also tell stem cells in adult organisms what functions to undertake. Once tissue formation starts, something has to tell it to stop before growth gets out of hand. In the Dec. 21, 2006 online edition of the scientific journal Developmen...

Even when faint, ovary scent draws sperm cells

... through a liquid medium. The device feeds three streams of liquid into a single chamber. Beyond the chamber, flows are split into three exit streams. Flow rate can be regulated simply by raising or lowering the height of the source medium, in this case a buffer solution. The researchers affixed a microsco...

Mosquito spray increases toxicity of pyrethroids in creek, study finds

...n that pyrethroids exist in agricultural and urban streams at levels toxic to sensitive aquatic life. General urban pesticide use, such as applying insecticides on lawns, gardens and around the perimeter of homes, is likely responsible for the bulk of the pyrethroids found in the sediment of urban streams, t...

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