The Columbia River receives numerous contaminants from permitted municipal and industrial discharges, nonpoint pollution, accidental spills, and hazardous waste sites. Studies by the U.S. Fish and Wildlife Service and others have documented bioaccumulation of organochlorine contaminants in fish and wildlife in or along the river, and these compounds have been associated with poor reproductive s...

Endoparasites can alter their host's heavy metal concentrations by sequestering metals in their own tissues. Contracaecum spp. (a nematode), but not Drepanocephalus spathans (a trematode), were bioaccumulating mercury to concentrations 1.5 times above cormorant hosts. Nematodes did not have significantly greater stable nitrogen isotope values (δ(15)N) than their hosts, which is contradictory to...

The article presents the history of nesting, disappearance from fauna and current spatial distribution Great Cormorant (Phalacrocorax carbo L., 1758) breeding colonies in Baikal Siberia. main research sites were Selenga River Delta, Strait Maloye More islands Chivyrkuy Bay, Upper Angara Bay on Lake; Barguzin hollows, Gusinoe Lake Pribaikalye Transbaikalye, where this species once lived accordin...