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Tag: "sediments" at biology news

Paleontologists learn how not to become a fossil

...gly, they found that burrowing clams living within sediments were no more likely to become fossils than similarly sized varieties that lived out in the open. Perhaps fittingly, parasitic clams fared the worst. "They live inside the burrow of another animal, like a shrimp, or they live parasitically upon the s...

The diversity of marine life in the Gulf of Maine region is much greater than previously thought

...small worms and other organisms living in the soft sediments that cover much of the sea floor and microscopic bacteria and viruses that live throughout the ecosystem. While most are invisible to the human eye, they are collectively major players in the web of ocean life." The Census of Marine Life is a globa...

Contaminants linked to sturgeon decline in Columbia river

...h move, the stuff they eat moves and the water and sediments bearing the contaminants moves. The Columbia receives input from numerous sources, so any population of fish at any one site can be exposed to a myriad of substances." The OSU researchers say it is difficult to estimate the numbers of sturgeon in th...

Habitat microstructure drives salamander metamorphosis

... the type, size and degree of sorting of streambed sediments for 22 populations, 11 paedomorphic and 11 metamor...trong negative correlation between small streambed sediments and paedomorphosis. Bonett and Chippindale explain that large gravel creates porous streambeds wit...

Mosquito spray increases toxicity of pyrethroids in creek, study finds

...e seen in the Sacramento creeks, where many of the sediments were toxic to H. azteca. That alone was not surpri...left in the water from the mosquito spray made the sediments even more toxic to H. azteca than they already were. The research team found that the level of PBO...

DOE JGI finishes 100th microbial genome

...layer in the carbon and nutrient cycles of aquatic sediments and in the bioremediation of organic and metal contaminants in groundwater. Rhodobacter sphaeroides. Samuel Kaplan, University of Texas Health Sciences Center at Houston. Metabolically diverse, grows in wide variety of conditions; photosynthetic, ...

Exxon Valdez oil found in tidal feeding grounds of ducks, sea otters

...ately, because much of this oil is buried in beach sediments and not exposed to weathering and other elements that might degrade it, it could remain hazardous to wildlife for decades." The Exxon Valdez stuck an underwater rock formation on March 24, 1989, spilling 11 million gallons of heavy crude oil into t...

Far more than a meteor killed dinos

...d by the Philadelphia Geological Survey. Marine sediments drilled from the Chicxulub crater itself, as well ...ties we can analyze the marine microfossils in the sediments directly above and below the Chicxulub impact layer and cannot find any significant biotic effect," ...

'Fruit fly dating game' provides clues to our reproductive prowess

...d by the Philadelphia Geological Survey. Marine sediments drilled from the Chicxulub crater itself, as well ...ties we can analyze the marine microfossils in the sediments directly above and below the Chicxulub impact layer and cannot find any significant biotic effect," ...

Paramecia adapt their swimming to changing gravitational force

...y. And in reverse gravity, they dove for where the sediments ought to be. "If you want to make something float more," said Valles, "you put it in a fluid and you pull the fluid down harder than you pull the thing down. And that's what we basically do with the magnet. That causes the cell to float more ?and th...

Finding an answer to Darwin's Dilemma

...gen levels in the world’s oceans at the time these sediments accumulated in Avalon. "Our studies show that the oldest sediments on the Avalon Peninsula, which completely lack animal fossils, were deposited during a time when the...

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

...g Crenarchaeota are pervasive in water columns and sediments throughout the ocean. Then in July 2006, German microbiologist Christa Schleper showed that nitrifying eota were up to 3,000-times more abundant in European soils than their bacterial counterparts. Mexico to Iceland At the AGU meeting, Franci...

Ancient ape ruled out of man's ancestral line

...from which he is now being slowly extracted. These sediments are themselves sandwiched between stalagmite layers which provided the materials for the dating process. Australopithecus walked on two legs, but stood just 130cm tall and had a brain comparable in size with a modern chimpanzee. As Dr Walker expla...

Life in the extreme

...o an end. Collaboration in the 'cold' As ocean sediments compact in cold seeps, fluids ooze out of the sediment and into the water. The cold-seep fluids contain chemical compounds produced by the decomposition of organic materials or by inorganic chemical reactions which occur at high temperatures and pres...

Volcanic eruptions, ancient global warming linked

... ash layers in east Greenland with those in marine sediments in the Atlantic Ocean. "We think the first volc...ing" of the lava flows and heating of organic-rich sediments in basins along the east Greenland margin were responsible for the global warming and changes in oce...

Microfossils unravel climate history of tropical Africa

... molecules sink to the sea floor and are buried in sediments where oxygen does not penetrate, they can be preserved for thousands of years. The ratios between the different molecules from the algal cell membrane can be used to approximate the past temperature of the sea surface. These techniques are therefore ...

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