Microhabitat Selection by Juvenile Coho Salmon in the Mainstem Clearwater River, Washington

摘要

The strong relationship between woody debris and juvenile coho salmon has been well established for small streams. However, no one has yet to investigate in larger streams. This paper describes summer habitat selection by juvenile soho salmon (Oncorhynchus kisutch) in the mainstem Clearwater River. The effect of woody debris was assessed by estimating coho salmon abundance in areas with and without woody debris. The effect of physical habitat variables on coho salmon abundance near woody debris, such as woody debris size and density, riverine habitat, substrate, water depth, and current velocity was evaluated using either a one- or two-way analysis of variance, analysis of covariance, or linear regression.