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The longitudinal and cross-sectional differences in habitat use between Gymnogobius oppeiens and Gymnogobius urotaenia (sister species) were investigated from June to July 2011 in the Shubuto River System, southwestern Hokkaido, Japan. Generalized linear model revealed that watercourse distance from the sea had a significant influence on the abundances of both G. opperiens and G. urotaenia but in...
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