Impact of Irrigation Canal Operations on the Fish Communities and Biomass of a Connected Stream

Great Plains Research Pub Date : 2022-03-14 DOI:10.1353/gpr.2022.0002

Jessica L. Davis, K. Koupal, M. Wuellner, Brett A. Roberg

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Abstract

abstract:The influence of canal operations on the available habitat and fish communities in conjoined Great Plains streams is not well understood. Three-pass backpack electrofishing was used twice within a three-week period in fall 2018 to identify changes in Turkey Creek (near Kearney, NE) before and after the Kearney Canal was dewatered. Diversity was greater while the canal was operational (t = 398.14, p < 0.001), but community composition remained similar following canal dewatering (J = 62.9%). Species-specific differences between the two time periods were most often observed among cyprinids and centrarchids, and nonnative species were more abundant (z = 6.0, p < 0.001) and comprised a greater percentage of the available biomass (z = 75.7, p < 0.001) when the canal was operational. The wetted width (t = 2.27, p = 0.04) and depth of Turkey Creek (t = 1.90, p = 0.06) significantly decreased after the canal ceased operation. Findings from this case study can be used to further the understanding of fish community responses within streams conjoined with canals and may provide regional water and fish managers important information to improve future management of these systems to support native fishes while simultaneously meeting other water uses for agriculture and recreation.

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灌溉渠运行对相连河流鱼类群落和生物量的影响

运河运营对大平原连流中可用生境和鱼类群落的影响尚不清楚。2018年秋季，三次背包电钓在三周内使用了两次，以确定科尔尼运河脱水前后土耳其河(东北部科尔尼附近)的变化。运河运行时群落多样性较大(t = 398.14, p < 0.001)，但运河脱水后群落组成基本不变(J = 62.9%)。两个时间段的物种特异性差异在鲤科和中央亚科中最为常见，当运河运行时，非本土物种更丰富(z = 6.0, p < 0.001)，占可用生物量的比例更大(z = 75.7, p < 0.001)。运河停运后，土耳其河的湿宽度(t = 2.27, p = 0.04)和深度(t = 1.90, p = 0.06)显著减小。本案例研究的结果可用于进一步了解与运河相连的溪流中鱼类群落的反应，并可能为区域水和鱼类管理者提供重要信息，以改善这些系统的未来管理，以支持本地鱼类，同时满足农业和娱乐的其他用水需求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Great Plains Research Social Sciences-Geography, Planning and Development

CiteScore

0.60

自引率

0.00%

发文量

期刊介绍： Great Plains Research publishes original research and scholarly reviews of important advances in the natural and social sciences with relevance to and special emphases on environmental, economic and social issues in the Great Plains. It includes reviews of books and reports on symposia and conferences that included sessions on topics pertaining to the Great Plains. Papers must be comprehensible to a multidisciplinary community of scholars and lay readers who share interest in the region. Stimulating review and synthesis articles will be published if they inform, educate, and highlight both current status and further research directions.