Title: CONDITION-SPECIFIC COMPETITION: IMPLICATIONS FOR THE ALTITUDINAL DISTRIBUTION OF STREAM FISHES
Abstract: EcologyVolume 81, Issue 7 p. 2027-2039 Article CONDITION-SPECIFIC COMPETITION: IMPLICATIONS FOR THE ALTITUDINAL DISTRIBUTION OF STREAM FISHES Yoshinori Taniguchi, Yoshinori Taniguchi Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Hokkaido 060-0808 Japan Present address: Department of Life Environmental Science, Yamaguchi Prefectural University, 3-2-1 Sakurabatake, Yamaguchi, Yamaguchi 753-8502 Japan. E-mail: [email protected]Search for more papers by this authorShigeru Nakano, Shigeru Nakano Tomakomai Research Station, Hokkaido University Forests, Tomakomai, Hokkaido 053-0035 Japan Present address: Center for Ecological Research, Kyoto University, Otsu 520-2113 Japan.Search for more papers by this author Yoshinori Taniguchi, Yoshinori Taniguchi Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Hokkaido 060-0808 Japan Present address: Department of Life Environmental Science, Yamaguchi Prefectural University, 3-2-1 Sakurabatake, Yamaguchi, Yamaguchi 753-8502 Japan. E-mail: [email protected]Search for more papers by this authorShigeru Nakano, Shigeru Nakano Tomakomai Research Station, Hokkaido University Forests, Tomakomai, Hokkaido 053-0035 Japan Present address: Center for Ecological Research, Kyoto University, Otsu 520-2113 Japan.Search for more papers by this author First published: 01 July 2000 https://doi.org/10.1890/0012-9658(2000)081[2027:CSCIFT]2.0.CO;2Citations: 163 Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract The occupation of adjacent, nonoverlapping positions along environmental gradients by closely related and ecologically similar species has drawn considerable attention from many ecologists over the past decades. Condition-specific competition, wherein competitive superiority varies with the abiotic environmental gradient, has been proposed as the major structuring force behind such distributions. However, few studies have elucidated the underlying mechanisms, such as behavioral and demographic processes. We conducted laboratory experiments to examine the effects of temperature on interspecific competition between two stream salmonid fishes, Salvelinus malma and S. leucomaenis. The two species have a largely allopatric altitudinal distribution on Hokkaido Island, Japan, proposed to be the result of temperature-mediated competition. We tested predictions that at a higher temperature (12°C), S. leucomaenis would dominate over S. malma in aggressive interactions, foraging performance, growth, and survival, but become subordinate at a lower temperature (6°C). Indeed, S. leucomaenis initiated a greater number of aggressive acts, attained greater food intake and greater growth, and finally excluded S. malma at the higher temperature. Although the two species initiated a similar number of aggressive acts and foraged equally well at the lower temperature, S. leucomaenis achieved a higher growth rate than S. malma; however, the latter eventually became numerically dominant. Clear competitive release in allopatry occurred for S. malma only at the higher temperature, providing direct evidence of condition-specific asymmetric competition. The lower distribution boundary of S. malma in Hokkaido streams may therefore be determined by temperature-mediated condition-specific competition. 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Publication Year: 2000
Publication Date: 2000-07-01
Language: en
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