Evaluation of effects of global warming and instream structure on freshwater fish in the World Natural Heritage ? Shiretoko, Japan.

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Presence of approximately 200 dams was confirmed in the study streams and Dolly Varden density was lower in high dam-density streams. Because dam density was positively correlated with maximum summer water temperatures, construction of dams caused stream temperature increase and possibly shrunk the thermal habitat of the fish. Also, number of days exceeding water temperature of 22℃ was greater in the high dam-density streams compared to the low-dam density ones.