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首页> 美国政府科技报告 >River Geomorphology and Fish Barriers Affect on Spatial and Temporal Patterns of Fish Assemblages in the Niobrara River, Nebraska
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River Geomorphology and Fish Barriers Affect on Spatial and Temporal Patterns of Fish Assemblages in the Niobrara River, Nebraska

机译：河流地貌和鱼类障碍对内布拉斯加州Niobrara河鱼类组合的时空格局的影响

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The Niobrara River in northern Nebraska traverses the heart of the Great Plains with portions of the river protected under the National Wild and Scenic River system managed by the National Park Service. The Niobrara River changes from a narrow, entrenched stream to a wide, highly braided river with four fish barriers and 36 distinct geomorphic segments in the lower 531 river kilometers (rkm). Our objectives were to examine the spatial and temporal patterns of fish assemblages in the Niobrara River related to environmental variables, fish barriers, and river geomorphology. Tote-barge electrofishing occurred monthly from June to September in 2009 at 17 sites downstream of Dunlap Diversion Dam near Hemingford, Nebraska (river kilometer (rkm) 531) to the mouth (rkm 0) where the Niobrara River meets the Missouri River. In all, we collected 33,888 fish from 42 species and 11 families. Species richness was greatest near the mouth (rkm 4) and subsequently declined sharply upstream of the first fish barrier (Spencer Dam; rkm 63). Monthly changes in the fish assemblages were generally low with most differences due to young of the year, large-bodied fish recruiting to the electrofishing gear.

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