Abiotic factors associated with the occurrence of introduced rainbow trout in the Atsuta River |
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| Authors: | Shigeru Kitanishi Toshiaki Yamamoto Masanori Nakagawa |
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| Institution: | (1) Graduate School of Environmental Earth Science, Hokkaido University, Sapporo Hokkaido, 060-0810, Japan;(2) Department of Veterinary Nursing and Technology, Nippon Veterinary and Life Science University, Musashino Tokyo, 180-8602, Japan;(3) Department of Regional Environmental Studies, Rakuno Gakuen University, Ebetsu Hokkaido, 069-8501, Japan;(4) Present address: Faculty of Life Science, Ritsumeikan University, Kusatsu Shiga, 525-8577, Japan |
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| Abstract: | To infer the distribution pattern of introduced rainbow trout, Oncorhynchus mykiss, we compared abiotic factors among tributaries with and without rainbow trout in the Atsuta River, Hokkaido, Japan. Rainbow
trout were present in 10 of the 24 tributaries. Stepwise logistic regression analysis indicated that the occurrence of rainbow
trout was more likely in low-gradient tributaries and was negatively correlated with elevation. Our results indicate that
the successful establishment of rainbow trout can be predicted using abiotic factors, including elevation and gradient. |
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