Effects of an introduced piscivorous fish on native benthic fishes in a coastal river
作者： Jason L. White , Bret C. Harvey
DOI: 10.1046/J.1365-2427.2001.00724.X
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摘要: SUMMARY 1. We used field surveys to compare the density and mesohabitat-scale distribution of native coastrange sculpin (Cottus aleuticus) prickly (C. asper) in coastal rivers north-western California, U.S.A., with without an introduced piscivorous fish, Sacramento pikeminnow, Ptychocheilus grandis. also measured mortality tethered a experiment including river, habitat type (pools versus riffles) cover as factors. 2. Average aleuticus C. asper combined) two pikeminnow was 21 times higher than average drainage pikeminnow. In riffles, differences sculpins among could be linked cover. However, riffles had 77 yet only nine more pools, availability did not differ rivers, but 11 3. experiment, varied substantially treatments ANOVA indicated significant River · Habitat Cover interaction (P < 0.001). Overall, suffered 40% over 24 h 2% suggesting that predation is mechanism by which affects sculpins. 4. The apparent reduction abundance has probably significantly altered food webs nutrient transport processes, increased probability extinction Eel drainage.
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