Biogeography,ecoregions, and geomorphology affect fish species composition in streams of eastern Oklahoma,USA |
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Authors: | Daniel C Dauwalter Dale K Splinter William L Fisher Richard A Marston |
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Institution: | (1) Oklahoma Cooperative Fish and Wildlife Research Unit and Department of Zoology, Oklahoma State University, Stillwater, OK, USA;(2) Department of Geography and Geology, University of Wisconsin–Whitewater, Whitewater, WI, USA;(3) United States Geological Survey, Oklahoma Cooperative Fish and Wildlife Research Unit and Department of Natural Resource Ecology and Management, Oklahoma State University, Stillwater, OK, USA;(4) Department of Geography, Kansas State University, Manhattan, KS, USA;(5) Present address: Department of Zoology and Physiology, Dept. 3166, University of Wyoming, 1000 East University Avenue, Laramie, WY 82071, USA |
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Abstract: | Stream fish assemblages are structured by biogeographical, physical and biological factors acting on different spatial scales.
We determined how physical factors, geomorphology and stream habitat, influenced fish species composition (presence–absence)
in eastern Oklahoma, USA relative to the ecoregion and biogeographic effects previously reported. We sampled fish assemblages
and surveyed geomorphology and habitat at 107 stream sites in the Boston Mountains, Ouachita Mountains, and Ozark Highlands
ecoregions in eastern Oklahoma. Partial canonical correspondence analyses (pCCAs) and variance partitioning showed that patterns
of endemism related to drainage basins and ecoregions explained important variation in fish species composition in all streams,
but stream size and local channel morphology explained more variation overall. Stream size effects were most important in
explaining variability in fish species composition in both northeastern and southeastern Oklahoma streams. Local channel morphology
and substrate characteristics were secondarily important. Variables typically considered important as fish habitat (aquatic
vegetation, etc.) had little effect on fish species composition. |
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Keywords: | Fluvial geomorphology River Continuum Concept Process Domains Concept Spatial scale Stream fish assemblage Habitat filters |
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