Limnology

In this May 15, 2019, file photo, the Lower Granite Dam on the Snake River is seen from the air near Colfax, Washington. The federal government said Friday, July 31, 2020, four giant dams on the Snake River in Washington state will not be removed to help endangered salmon migrate to the ocean. (AP Photo/Ted S. Warren, File)
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July 31, 2020 - 3:17 pm
SPOKANE, Wash. (AP) — The U.S. government announced Friday that four huge dams on the Snake River in Washington state will not be removed to help endangered salmon migrate to the ocean. The decision thwarts the desires of environmental groups that fought for two decades to breach the structures...
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In this handout released by Governor of Yamalo-Nenets region Press Office, people dig in silt searching for mammoth bone fragments in the Pechevalavato Lake in the Yamalo-Nenets region, Russia, Wednesday, July 22, 2020. Fragments of a mammoth skeleton have been found by local reindeer herders in the lake a few days ago, and scientists hope to retrieve the entire skeleton - a rare find that could help deepen the knowledge about mammoths that have died out around 10,000 years ago. (Artem Cheremisov/Governor of Yamalo-Nenets region of Russia Press Office via AP)
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July 24, 2020 - 12:17 pm
MOSCOW (AP) — Russian scientists are working to retrieve the well-preserved skeleton of a woolly mammoth, which has some ligaments still attached to it, from a lake in northern Siberia. Fragments of the skeleton were found by local reindeer herders in the shallows of Pechevalavato Lake on the...
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This photo provided by the U.S. Fish and Wildlife Service shows an Arctic grayling captured in a U.S. Fish and Wildlife Service fish trap at Red Rock Lakes National Wildlife Refuge near Lima, Montana. U.S. wildlife officials have rejected federal protections for the rare, freshwater fish species at the center of a long-running legal dispute. The decision, on Wednesday, July 22, 2020, comes almost two years after a federal appeals court faulted the U.S. Fish and Wildlife Service for dismissing the threat that climate change and other pressures pose to Arctic grayling. (Jim Mogen/U.S. Fish and Wildlife Service via AP)
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July 22, 2020 - 7:14 pm
BILLINGS, Mont. (AP) — U.S. wildlife officials on Wednesday rejected special protections for a rare, freshwater fish related to salmon that's been at the center of a long-running legal dispute, citing conservation efforts that officials say have increased Arctic grayling numbers in a Montana river...
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In this Nov. 11, 2016, photo provided by the Museum of Hydrobiological Science of the Chinese Academy of Sciences, a Chinese paddlefish specimen made in 1990 is seen on display at the Museum of Hydrobiological Science of the Chinese Academy of Sciences in Wuhan, China. The Chinese paddlefish's sharp, protruding snout made it one of the largest freshwater species in the world. Since scientists declared it extinct in a research paper published last week, Chinese internet users media outlets have been paying tribute to the hefty creature. (Museum of Hydrobiological Science of the Chinese Academy of Sciences via AP)
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January 10, 2020 - 10:10 am
BEIJING (AP) — The Chinese paddlefish's sharp, protruding snout made it one of the largest freshwater species in the world. Since scientists declared it extinct in a research paper published last week, Chinese internet users and media outlets have been paying tribute to the hefty creature. “It's...
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In this Oct. 17, 2019, photo provided by the U.S. Fish and Wildlife Service, a pile of recently dead freshwater mussels are piled along the shore of the Clinch River near Wallen Bend, Tenn. While freshwater mussels have been plagued for decades by habitat loss, invasive species, pollution, sedimentation and other issues, there's a possibility that the die-off in the Clinch River could be connected to infectious disease. (Meagan Racey/U.S. Fish and Wildlife Service via AP)
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December 17, 2019 - 1:17 am
KYLES FORD, Tenn. (AP) — On a recent late fall afternoon at Kyles Ford, the white branches of sycamore trees overhung the banks of the Clinch River, leaves slowly turning yellow. Green walnuts covered the ground. The shallow water ran fast and cold over the rocky bottom, but it was littered with...
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FILE - In this June 13, 2012, file photo, Asian carp, jolted by an electric current from a research boat, jump from the Illinois River near Havana, Ill. Sport fish have declined significantly in portions of the Upper Mississippi River infested with Asian carp, apparently confirming fears about the invaders' threat to native species, according to a newly released study. Analysis of more than 20 years of population data suggests the carp are out-competing fish prized by anglers, such as yellow perch, bluegill, and black and white crappie, the report said. (AP Photo/John Flesher, File)
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November 16, 2019 - 11:16 am
TRAVERSE CITY, Mich. (AP) — A new study says sport fish have declined significantly in portions of the Upper Mississippi River infested with Asian carp. The study’s lead author says it’s among the first to establish a solid link between the presence of invasive carp and a drop-off of native species...
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Dead fish lie on the shores of Koroneia Lake in northern Greece, on Thursday, Sept. 19, 2019. Tens of thousands of dead fish are washing up as the water level has plummeted to less than a meter deep (three feet) and the lack of oxygen in the water is leading to mass mortality of everything in it. (AP Photo/Giannis Papanikos)
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September 19, 2019 - 12:54 pm
KORONEIA, Greece (AP) — Tens of thousands of dead fish have been found on the banks of a lake in a protected nature reserve in northern Greece after high temperatures and drought conditions caused a severe drop in water levels. State environmental officials said Thursday that the water level at...
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U.S. Sen. Mike Rounds, R-SD, chairman of the Senate subcommittee on Superfund, Waste Management and Regulatory Oversight, listens as Bill Beacom of Sioux City, Iowa, a retired Missouri River ship captain, makes a point after Rounds held a hearing on the U.S. Army Corps of Engineers' management of 2019 Missouri River Basin flooding Wednesday, Aug. 28, 2019, in North Sioux City, South Dakota. (Tim Hynds/Sioux City Journal via AP)
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August 28, 2019 - 9:27 pm
NORTH SIOUX CITY, S.D. (AP) — An official with the U.S. Army Corps of Engineers said Wednesday a study is needed to consider changes to flood-control measures along the Missouri River south of Sioux City, Iowa. Speaking after a U.S. Senate field hearing in North Sioux City, South Dakota, Brig. Gen...
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FILE - In this June 13, 2012, file photo, Asian carp, jolted by an electric current from a research boat, jump from the Illinois River near Havana, Ill. A newly released study says if Asian carp reach Lake Michigan, they probably would find enough food to spread far and wide. Some experts have questioned whether there’s enough plankton in the lake to sustain the invasive carp away from shoreline areas. But the new report released Monday, Aug. 12, 2019, by University of Michigan scientists says despite a drop-off of plankton caused by exotic mussels, the voracious carp could feed on other organic material when venturing into deeper waters. (AP Photo/John Flesher, File)
August 12, 2019 - 2:42 pm
TRAVERSE CITY, Mich. (AP) — Asian carp are likely to find enough food to spread farther if they establish breeding populations in Lake Michigan, reinforcing the importance of preventing the invasive fish from gaining a foothold, scientists said in a paper released Monday. A study led by University...
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May 04, 2019 - 12:31 pm
FLAGSTAFF, Ariz. (AP) — Ted Kennedy sums up what he sees along the river in the Grand Canyon: "It's buggy out there." That is to say, an experiment to change the flow of water from a dam near the Arizona-Utah state line appeared to boost the number of aquatic insects that fish in the Colorado River...
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