Tag: "sediment" at biology news
Are museum collections of ancient life representative?
...bulk collection is "when you chop a cubic meter of sediment
out of a river bank, for instance," Barbour Wood said. "The larger the sample, or more samples you collect, the more likely you are going to get all of the preservable organisms that lived in an area in a particular time period." For her research, sh...
Researchers tracking sources of arsenic contamination in water
...once it is in the water, how it interacts with the sediment
and with bacteria." Since much of the arsenic contamination is natural, rather than as a result of industry, "and a little bit goes a long way, the taxpayers will have to pay for prevention. But prevention is less expensive than remediation," she sai...
Deciphering the Arctic Ocean climate puzzle
...rated Ocean Drilling Program (IODP), 340 meters of sediment
core were retrieved from the bottom of the Arctic ...ta analysis indicates that the upper 160 meters of sediment
retrieved represent a continuous record of the past ~15 million years. The cores suggest that ice-co...
People cause more soil erosion than all natural processes
...the bottom line is, we move about 10 times as much sediment
as all natural processes put together," he said. Because soil formation proceeds at about the same rate as natural erosion, Wilkinson's results mean that humans are stripping soil from the surface of the Earth far faster than nature can replace it. ...
Extinction in ocean's mud presages key ecological changes
...marine benthos - the top 6 inches or so of mud and sediment
on the floors of the world's oceans - is giving sc...and a co-author of the paper. "What goes on in the sediment
is important, not only because it affects life at the bottom of the ocean, but also because it has a...
Researchers probe marine mysteries off the Alaskan coast
...researchers extensively mapped the area, collected sediment
samples and probed the region with Woods Hole Oceanographic Institution's Jason II remotely operated vehicle (ROV). They charted new canyons and features of this previously unexplored, remote region of the world. Using multibeam mapping technology...
A complex agricultural society in Uruguay's La Plata basin, 4,800-4,200 years ago
...ounding a central plaza area. Iriarte extracted a sediment
core from nearby wetlands to reconstruct what the environment was like when this farming society arose. Combined analyses of preserved pollen and phytoliths indicated that, as in other regions of the world, the mid-Holocene was characterized by signi...
Wolves gone, western ecosystems suffer
...ulations will lead to even more changes, including sediment
retention, wetland maintenance and nutrient cycling. And the story, the OSU scientists say, appears to be much larger than just Yellowstone National Park or the mountainous regions around it, as demonstrated by a broad range of research. ...
Violent ocean motion no magic potion for reefs
...ten dredged from offshore borrow pits, where silty sediment
much finer than sand normally found on beaches and around reefs accumulates. A number of Palm Beach County reefs are covered in such silty material. At reefs closer to shore, in water depths of 40 feet or less, the team has been finding coarser beach...
Pinatubo's rivers show the danger isn't over when volcanic eruption ends
...olcano deposits and how much rain falls, until the sediment
has either been cleaned off the mountain or has st...ers traverse areas that still have vast amounts of sediment
that can be washed away easily. Pinatubo's location, in the tropics not far north of the equator, ma...
New evidence indicates biggest extinction wasn't caused by asteroid or comet
...a nearly 1,000-foot thick section of exposed Karoo sediment
deposits from the time of the extinction. They found two patterns, one showing gradual extinction over about 10 million years leading up to the boundary between the Permian and Triassic periods, and the other for a sharp increase in extinction rate a...
Transgenic plants remove more selenium from polluted soil than wild plants, new tests show
... In California, as much as 100,000 cubic meters of sediment
contaminated with selenium, salt and boron remain ...ies in birds. The researchers say cleaning up the sediment
in the San Luis Drain could cost millions of dollars using conventional methods, including soil wash...
USGS featured at AAAS - Nation's largest science meeting
...mplementation of practices to reduce nutrients and sediment
and the response in the Chesapeake Bay ecosystem. These factors make meeting the restoration of water-quality conditions in the Bay by 2010 very difficult. As a part of this symposium, Scott Phillips, USGS Chesapeake Bay Program Coordinator, will dis...
South America's vast pantanal wetland may become next everglades, UNU experts warn
...g dams or changing water quality by increasing the sediment
load in rivers." "As economic development proceeded rapidly however, new stakeholders emerged along with the industrialization such as agriculture, modern cattle ranching, transport industry, hydroelectric energy production and mining. The Pantanal'...
Satellite images give a better picture of sediment transport
...tivities are inducing large amounts of terrigenous sediment
input to the southwest lagoon of New Caledonia. Su...r to unravel the system of current circulation and sediment
transport (1). Satellite remote sensing provides reliable quantified data on the concentration of su...
An (ecological) origin of species for tropical reef fish
... barrier. The Amazon and Orinoco's freshwater and sediment
discharge off of northeastern South America is so immense that it precludes coral reef formation from the mouth of the Amazon North to Trinidad and Tabago. This 2000 km gap is believed to be a strong barrier for corals and associated reef organisms....
Currents could disrupt ocean food chain
...e evidence backing that up," he added. "Deep ocean sediment
core samples show pebbles from land delivered by t...ocean nutrient concentrations measured in deep-sea sediment
cores. "One full oscillation of these switches took 1,500 years," Schmittner said, "but the individ...
Water research initiatives at UW-Madison
...egetation near rivers and streams that help remove sediment
and pollutants from runoff before it enters the stream. The initiative's key question: Amid thousands of miles of state waterways, how does Wisconsin use limited resources to place buffers where they are most needed? UW-Madison limnologist Jake Vande...
Nano-particle research will benefit inhaler-users
...blems with both methods - a suspension can lead to sediment
in the inhaler and less of the drug reaching the target area of the lung, while solutions present problems in dissolving the drug in the inhaler propellant liquid and can make the drug itself less stable." The Cardiff team's approach is to prepare th...
New thermometer reveals wet conditions on earliest Earth
...h began a pattern of crust formation, erosion, and sediment
recycling as early in its evolution as 4.35 billion years ago, which contrasts with the hot, violent environment envisioned for our young planet by most researchers and opens up the possibility that life got a very early foothold," said E. Bruce Wats...
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