Fish Community Structure in Relation to Environmental Variables within theSacramento River Basin and Implications for the Greater Central Valley, California

摘要

Twenty-two sites in the Sacramento River Basin, California, were sampled from1996 to 1998 to characterize fish communities and their relation to water quality and habitat quality. The feasibility of developing an Index of Biotic Integrity (IBI) for the study area was assessed by evaluating six fish community metrics, including percentage of native fish, number of native species, percentage of intolerant fish, number of tolerant species, percentage of omnivorous fish, and percentage of fish with external anomalies. Of the 36 taxa of fish captured during the study, only 13 taxa were native to the drainage. Multivariate analyses identified four site groups that were characterized by four species groups.