Assessment of Introduced Prickly Sculpin Populations in Mountain Lakes in Two Areas of Western Washington State

摘要: Abstract Short-distance (i.e., < 100 km) introductions of diminutive fish species are often not well documented but may have important ecological consequences. Prickly sculpin (Cottus asper), which native to lowland habitats the Pacific Northwest, been introduced in some mountain lakes western Washington State. The ecology six populations prickly was investigated through daytime minnow trapping, diet analysis, and age growth analysis. Results trapping indicated were abundant each lake (Nisqually River lakes, mean = 11.3 individuals/trap; Dry Bed Lakes Satsop basin, 1.9 individuals/trap). Nisqually composed primarily micro-crustaceans (92% by number all prey items; dominated copepods cladocerans), chironomids, mollusks, In Lakes, caddisflies, oligochaetes, micro-crustaceans. lentic habitats,...