Ocean Sediments Contain Record of Past Vegetation Fires in Africa
...ay then be transported long distances by winds and rivers to coastal and ocean environments, where it's then preserved in ocean sediments. Explains Verardo, "Charcoal may be swept aloft in plumes rising from active fires, and transported by prevailing winds from the source area to the ocean within days to ...Changing Continental Runoff Patterns Could Change Ocean Circulation
...is that the fresh water running out of continental rivers decreases the salinity of the oceans' surface. Natural evaporation in the Tethys sea tended to increase the salinity of the surface water. Circulation in the oceans can be caused by colder water sinking below warmer water or saltier, denser water......n cases of exotic creatures invading the country's rivers and estuaries, scientists have for the first time documented the invasion into U. S. coastal waters of a type of marine microorganism. In a talk to be given on Thursday, Oct. 31, at the annual meeting of the Geological Society of America in Denver, D...Nutrients, Ground Water, And The Chesapeake Bay - A Link With Pfiesteria?
... from the land surface and make their way into the rivers and streams that flow into the Bay, or directly into the Bay itself. Ground water is an important source of surface water and nutrients. The USGS has determined that about 50 percent of the water in streams comes from ground water, but the amount...Natural Variability Is Key To River Restoration
...ell ecologist Bain cited five examples of American rivers that still run free, and four that could with a li...olorado) and Little Colorado (Arizona): "The last rivers supporting the largely exterminated fishes of the Colorado River system." Hudson River (New York, N...Guidelines For Next Generation Of Environmental Policy
...y for sweeping environmentalreforms. Contaminated rivers like Ohio's Cuyahoga River -- so saturated withpol...difficult to address than the black skies ororange rivers of a generation ago. "Like nature itself, environmental problems constantly evolve. So, too...USGS 1999 Budget Emphasizes Clean Water, Disaster Information, Species And Habitat Research
...S to evaluate nutrient loads andtransport in major rivers and ground-water systems,including a specific focu...llution sources on water quality and ecosystems of rivers andcoastal estuaries; provide data to help states determine the Total Maximum Daily Loads as require...Purdue Research Helps Keep Phosphorus Out Of Surface Water
...searchers knew years ago that excess phosphorus in rivers could cause trouble, but they thought most of it came from urban and industrial waste, not farm fields. "Even 10 years ago the prevailing thought was that phosphorus in fields didn't move, unless it eroded away with soil," says Purdue agronomist Brad...Reduced Nutrients Still Cause Problems In The Neuse And Tar-Pamlico Rivers
...providing some important clues as to why these two rivers seem to have more than their share of water-qualit... when fishkills and nuisance algal blooms occur in rivers and estuaries because environmental conditions are more favorable for rapid algal growths at this ti...From The Home Front To The River Front, USGS Updates Water-Quality Information
...but these contaminants are still being detected in rivers and streams. The USGS cautioned that the fish wer...s have changed over the past 10 to 20 years in the rivers where they flow into Chesapeake Bay. The amount of nutrients delivered to Chesapeake Bay is dependa...USGS Says Central Columbia Plateau Water Quality Impaired by Agriculture, But Some Good News
...00-square mile area between the Columbia and Snake rivers that includes the cities of Moses Lake and Pullman, Washington, and the entire Palouse River Basin; it is one of more than 50 areas across the Nation being investigated by the USGS as part of its National Water-Quality Assessment (NAWQA) program. Thr...EPA And UC Researchers Find Bacteria That Can Destroy Giardia Cysts
...urface water, Rodgersdecided to sample streams and rivers around Greater Cincinnatilooking for microbes which might be able to feed on the Giardia cysts. "It's always been known that the viabilityof cysts decreases over time in a natural environment. We wereinterested in knowing what kind of biological fac...Banking On Safer Drinking Water
...rside Soil As A Natural Purifying Agent Bustling rivers such as the Mississippi and the Ohio are thesource... fromwells alongside the Wabash, Ohio and Missouri rivers near TerraHaute, Ind.; Louisville, Ky.; and Kansas City, Mo. The wells areall owned by the American ...Weevils Wipe Out Killer Weeds In Papua New Guinea
...s were causing great hardship to people using the rivers and streams to move around the country - like a road network. According to Mr Mic Julien from CSIRO Entomology, the release of biological control agents such as weevils dramatically reduced the areas covered by the weed. "Over the past five ...New Long-Term Ecological Research Site Funded For Plum Island Sound Ecosystems Study
...over how productivity in estuaries -- places where rivers meet the sea -- isaffected by changes in land cove...ial and oceanic systems. "But human activities in rivers and watershedshave enormously altered such estuarine ecosystems through inputs of materialssuch as w......6, session 5 The potential opening of Great Lakes rivers such as the Wolf and Menominee Rivers in Wisconsin...nant population in 1990, the Neosho and Cottonwood rivers had modest madtom populations. Scientists speculate that the small, bottom-feeding, Nesosho madtom ...Commercial Fish: Eat Up, Despite Low Levels Of Mercury
...tants that limit consumption of fishfrom lakes and rivers across the nation, and individual statesrely on federal guidelines when developing recommendations on howmany fish can be eaten per week or month. If federal agencieslower the level of mercury they say is acceptable in the diet,that would likely forc...USGS Finds Fungus To Be A Cause Of Fish Lesions In Chesapeake
...nedmenhaden sampled from the Pocomoke and Wicomico rivers in August 1998. In earlyOctober, USGS scientists will collect additional samples from the Bay. The fungus, said Blazer, appears to be a pathogenic species of Aphanomyces thathas caused identical lesions and fish kills of estuarine and freshwate...Zinc In Sludge From Spanish Reservoir Break Equals Mine's Annual Output, Researchers Find
...panish zinc mine has dumped an amount of zinc into rivers nearly equal to themine"s total annual output. ...ed the amount of zinc inwater and sediments in the rivers downstream from the Los Frailes mine earlylast May. They concluded that the sludge released from th......thways and concentrations of contaminants in large rivers like theMississippi tells an interesting story of ...orage of sediments and pollutants in numerouslarge rivers across the globe. His leadership in an interdisciplinary study ofsediment-transported pollutants in ...