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The Influence of Groundwater on the Population Size and Total Length of Warmwater Stream Fishes

机译:地下水对水下流鱼类人口大小和总长度的影响

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Groundwater influences stream environments in numerous ways including structuring biotic assemblages. However, associations between groundwater influence and warmwater fish assemblages are under-studied. We examined relationships between groundwater contribution, population size, and total length (TL) for 5 warmwater fishes at 32 stream reaches in the Ozark Highlands ecoregion. When we controlled for distance from an impoundment, population size and TL were significantly related to groundwater influence for all 5 species. Sunfishes were significantly less abundant in reaches with high levels of groundwater contribution (HGC reaches), whereas Ambloplites rupestris (Rock Bass) and Nocomis asper (Redspot Chub) TLs were significantly greater at HGC reaches. Reach-scale groundwater contribution explained nearly 4 times more unexplained variation among fish densities than did TL. Our study provides insight into the structuring role of groundwater on warmwater fish populations.
机译:地下水以多种方式影响流环境,包括结构化生物组合。 然而,正在研究地下水影响和温水鱼组合之间的关联。 在32个溪流中,我们检查了地下水贡献,人口规模和总长度(TL)之间的关系,在32个溪流中到达Ozark Highlands Ecoregion。 当我们从蓄水中控制距离时,人口大小和TL与所有5种的地下水影响显着相关。 由于高水平的地下水贡献(HGC达到),日霜率明显不那么丰富,而ambloples卢比(岩石贝司)和Nocomis asper(Redspot chub)tls在hgc达到的情况下显着更大。 到达范围的地下水贡献解释了鱼密度之间的近4倍,而不是TL。 我们的研究提供了深入了解地下水在温水鱼群上的作用。

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