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首页> 外文期刊>Journal of the American Water Resources Association >CONNECTING GROUND WATER INFLUXES WITH FISH SPECIES DIVERSITY IN AN URBANIZED WATERSHED
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CONNECTING GROUND WATER INFLUXES WITH FISH SPECIES DIVERSITY IN AN URBANIZED WATERSHED

机译：在城市化流域中将地下水入流与鱼类物种多样性联系起来

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摘要

Valley Creek watershed is a small stream system that feeds the Schuylkill River near Philadelphia, Pennsylvania. The watershed is highly urbanized, including over 17 percent impervious surface cover (ISC) by area. Imperviousness in a watershed has been linked to fish community structure and integrity. Generally, above 10 to 12 percent ISC there is marked decline in fish assemblages with fish being absent above 25 percent ISC. This study quantifies the importance of ground water in maintaining fish species diversity in subbasins with over 30 percent ISC. Valley Creek contains an atypical fish assemblage in that the majority of the fish are warm-water species, and the stream supports naturally reproducing brown trout, which were introduced and stocked from the early 1900s to 1985. Fish communities were quantified at 13 stations throughout the watershed, and Simpson's species diversity index was calculated. One hundred and nine springs were located, and their flow rates measured. A cross covariance analysis between Simpson's species diversity index and spring flow rates upstream of fish stations was performed to quantify the spatial correlation between these two variables. The correlation was found to be highest at lag distances up to about 400 m and drop off significantly beyond lag distances of about 800 m.
机译：Valley Creek流域是一条小溪流系统，为宾夕法尼亚州费城附近的Schuylkill河供水。该流域高度城市化，包括按面积计超过17％的不透水表层（ISC）。流域的不渗透性与鱼类群落的结构和完整性有关。通常，ISC高于10％至12％时，鱼类种群显着下降，而ISC超过25％则没有鱼类。这项研究量化了地下水在维持ISC超过30％的流域鱼类物种多样性中的重要性。山谷溪包含一种非典型的鱼类，其中大部分鱼类是温水鱼类，溪流支持天然繁殖的鳟鱼，该鳟鱼于1900年代初期至1985年间被引入和放养。分水岭，并计算了辛普森的物种多样性指数。找到一百零九个弹簧，并测量其流量。进行了辛普森物种多样性指数和鱼类站上游的春季流速之间的交叉协方差分析，以量化这两个变量之间的空间相关性。发现相关性在大约400 m的滞后距离处最高，并且在大约800 m的滞后距离处显着下降。

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