Diel Fish Habitat Selection in a Tributary Stream

摘要: Abstract This study investigated the location and diel habitat preferences (at 100 m reach scale) of fish in a small tributary stream late spring, early summer. During day, coho (Oncorhynchus kisutch) preferred areas with more cover (deeper, greater extent undercut banks) vs. night when LWD was (Pearson correlation step-wise MLR). Chinook (O. tshawytscha) exhibited an opposite pattern, preferring during day higher velocity at night. suggests these two potadromous species may be partitioning resources. Pooling coho, chinook rainbow trout mykiss) indicated reaches were selected (r2 = 0.86, p 0.005) deeper 0.62, 0.04). Although not measured specifically, we believe supports macroinvertebrate production predominantly sandy substrate. Thus, potential mechanism behind observed patterns selection tradeoff between food resource abundance predation ri...