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首页> 外文期刊>Environmental Biology of Fishes >Biogeography, ecoregions, and geomorphology affect fish species composition in streams of eastern Oklahoma, USA
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Biogeography, ecoregions, and geomorphology affect fish species composition in streams of eastern Oklahoma, USA

机译：生物地理学，生态区和地貌学会影响美国俄克拉荷马州东部河流中的鱼类物种组成

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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.
机译：溪流鱼类组合由作用于不同空间尺度的生物地理，物理和生物因素构成。我们确定了相对于先前报道的生态区和生物地理影响，物理因素，地貌和河流栖息地如何影响美国俄克拉荷马州东部鱼类的种类组成（有无）。我们在俄克拉荷马州东部的波士顿山，沃希托山山和奥索卡高地生态区的107个溪流场取样了鱼类，并调查了地貌和栖息地。部分典型对应分析（pCCAs）和方差划分表明，与流域和生态区有关的地方性模式解释了所有溪流中鱼类物种组成的重要变化，但溪流大小和局部河道形态总体上说明了更多的变化。在解释俄克拉荷马州东北流和东南流中鱼类物种组成的变异性时，流径效应是最重要的。其次，局部通道的形态和底物特性很重要。通常认为重要的变量是鱼类的生境（水生植被等），对鱼类的组成影响很小。

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