Comparison of competitive ability between native and introduced salmonids: evidence from pairwise contests |
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Authors: | Email author" target="_blank">Koh?HasegawaEmail author Toshiaki?Yamamoto Masashi?Murakami Koji?Maekawa |
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Institution: | (1) Laboratory of Conservation Biology, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo, Hokkaido, 060-0809, Japan;(2) Tomakomai Experimental Forest, Takaoka, Tomakomai, Hokkaido, 053-0035, Japan;(3) Present address: Laboratory of Functional Food Science, Nippon Veterinary and Animal Science University, Kawasaki, 211-8533, Japan |
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Abstract: | Brown trout, Salmo trutta, and rainbow trout, Oncorhynchus mykiss, have been introduced to freshwaters in Hokkaido, Japan. Today, it is recognized that these introduced salmonids have negative impacts on native salmonids such as white-spotted charr, Salvelinus leucomaenis, and masu salmon, O. masou. In particular, interspecific competition may be an important mechanism that could contribute to the exclusion for native salmonids. In this study, experimental pairwise contests were conducted to compare interference competitive ability between native and introduced salmonids. We demonstrated that brown trout were competitively superior to white-spotted charr and masu salmon whereas rainbow trout were superior to white-spotted charr. We suggest that introduced brown trout negatively impact both white-spotted charr and masu salmon, and introduced rainbow trout negatively impact white-spotted charr. |
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Keywords: | Interference competition Competitive ability Salmonid introduction Interspecific dominance relationships |
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