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We systematically evaluated the influence of dams on downstream aquatic habitat and early life stage (ELS) fish at two spatial scales from epilimnetic and hypolimentic discharges and made comparisons to a control stream. ELS fish exhibited a general increase in abundance, richness, and Shannon diversity with increasing distance from dams in both epilimnetic and hypolimnetic release types. Nonmetric multidimensional scaling (NMDS) indicated larval and juvenile fish communities were structured differently between epilimnetic and hypolimnetic releases and habitat variables structuring those communities were more variable in epilimnetic releases than hypolimnetic releases. Rapid changes occurred within the first 1,100-m reach and a second more gradual gradient extended beyond the 5,100-m sample reach. Generally, our findings agreed with that of the Serial Discontinuity Concept (SDC) but we believe future studies should be explicit in the systematic evaluation of the SDC and further studies are required to und...

canadian journal of fisheries and aquatic sciences

Evaluation of the influences of dam release types, land use, and habitat affecting abundance, richness, diversity, and community structure of larval and juvenile fish