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Hydrologic habitat preferences of select southeastern USA fishes resilient to river ecosystem fragmentation

机译：精选的美国东南部鱼类对河流生态系统破碎具有复原力的水文栖息地偏好

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Large-scale habitat preferences of riverine taxa are not always revealed by examining community data. Here, we show how lipid and growth can be used to evaluate hydrologic habitat preferences of fishes resilient to river fragmentation (i.e. species that can tolerate river fragmentation by dams, but not collapse). Lipid content was examined for seven fishes in a major southeastern USA reservoir and its largest lotic tributary over the 5 years. Controlling for effects of sex, size and year of collection, largemouth bass, spotted bass and black crappie had significantly higher lipid in lentic habitat. Conversely, channel catfish and freshwater drum had significantly higher lipid in lotic habitat. There were no significant differences in lipid of bluegill and blacktail shiner between hydrologic habitat types. Fish growth produced concordant results as largemouth bass and spotted bass had significantly faster growth in lentic habitat, whereas channel catfish and freshwater drum had significantly faster growth in lotic habitat. We were also able to document a synchronous spike in lipids of these species in both habitat types during a major drought. We surmise that the spike was driven by enhanced primary production, predator-prey concentration and possibly also reduced reproduction during intense drought. Two conclusions are drawn from this study as a whole. First, long-term lipid and growth observations hold promise for evaluating ecological effects of droughts over long time spans. Second, population characteristics are excellent indicators of habitat preferences and could be used more broadly to elucidate how organisms react to river ecosystem fragmentation and restoration initiatives.
机译：并非总是通过检查社区数据来揭示河流分类单元的大规模生境偏好。在这里，我们展示了如何利用脂质和生长来评估能抵抗河流破碎的鱼类的水文生境偏好（即可以忍受水坝造成河流破碎但不会倒塌的物种）。在过去的5年中，对美国东南部主要水库及其最大的支流支流中的7条鱼的脂质含量进行了检查。控制性别，大小和采集年限的影响，大嘴鲈，斑点鲈和黑app在豆荚栖息地的脂质明显较高。相反，channel鱼和淡水鼓在水habitat栖息地的脂质明显较高。在水文生境类型之间，blue和黑尾光泽的脂质没有显着差异。鱼的生长产生了一致的结果，因为大嘴鲈和斑点鲈在lentic生境中的生长明显更快，而whereas鱼和淡水鼓在lotic生境中的生长明显更快。我们还能够记录到在严重干旱期间两种生境类型中这些物种的脂质同步上升。我们推测峰值是由初级生产的增加，捕食者-猎物的集中以及可能在强烈干旱期间繁殖能力下降引起的。从整个研究得出两个结论。首先，长期的脂质和生长观测有望在很长一段时间内评估干旱的生态影响。其次，人口特征是栖息地偏好的极好的指标，可以更广泛地用于阐明生物体对河流生态系统破碎化和恢复计划的反应。

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