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Hybridization between native white-spotted charr and nonnative brook trout in the upper Sorachi River,Hokkaido, Japan |
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| Authors: | Satoshi Kitano Satoshi Ohdachi Itsuro Koizumi Koh Hasegawa |
| Institution: | 1. Nagano Environmental Conservation Research Institute, Nagano, 381-0075, Japan 2. Institute of Low Temperature Science, Hokkaido University, Kita-ku, Sapporo, 060-0819, Japan 3. Faculty of Environmental Earth Science, Hokkaido University, Kita-ku, Sapporo, 060-0810, Japan 4. Field Science Center for Northern Biosphere, Hokkaido University, Kita-ku, Sapporo, 060-0811, Japan 5. Hokkaido National Fisheries Research Institute, Fisheries Research Agency, Nakanoshima, Toyohira, Sapporo, Hokkaido, 062-0922, Japan |
| Abstract: | Invasion status and impacts of nonnative brook trout (Salvelinus fontinalis) in a Hokkaido stream were investigated with field surveys and genetic analyses. Nonnative brook trout was detected in nine (41 %) of the 22 sampled reaches in three tributaries of the Sorachi River, Hokkaido, Japan. Based on the external pigmentation, twelve putative hybrids between brook trout and native white-spotted charr (Salvelinus leucomaenis) were collected in two reaches. Microsatellite and mitochondrial DNA data established that 58% of these hybrids were first-generation (F1) progenies between male brook trout and female white-spotted charr. Our results suggest potential negative impacts of nonnative brook trout on native charr populations in Hokkaido through interspecific interactions. |
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