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After resolution of habitat fragmentation by an erosion‐control dam, non‐native brown trout Salmo trutta invaded the upstream side of the dam and displaced native white‐spotted charr Salvelinus leucomaenis in Monbetsu stream, Hokkaido, northern Japan.
The spatial scale and density‐dependent effects of non‐native brown trout Salmo trutta on species richness of fish assemblages were examined at 48 study sites in Mamachi Stream, a tributary of Chitose River, Hokkaido, Japan. The density of age ≥1 year S. trutta was high in the upstream side of the main stem of Mamachi Stream. Fish species richness increased with increasing area of study sites (habitat...
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