Distribution, Relative Abundance, and Length of Sculpins in the Elwha River Watershed Following the Removal of Two Hydroelectric Dams

IF 0.5 4区 环境科学与生态学 Q4 ECOLOGY
R. Tabor, J. R. Johnson, R. Peters, Rebecca Mahan, M. McHenry, Samuel J. Brenkman, G. Pess, T. Bennett, M. Liermann
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引用次数: 0

Abstract

Abstract Dam removal often shows positive effects for many fish species, especially migratory species. In contrast, information regarding the effects on less migratory species is lacking. The Elwha River, Washington had two hydroelectric dams removed from 2011 to 2014, which resulted in the loss of two reservoirs. Because of glacial history, the Elwha River system has a depauperate freshwater fish fauna, including just two sculpin species (coastrange sculpin [Cottus aleuticus] and prickly sculpin [C. asper]). Both species exhibit a similar migratory life history strategy, which includes a planktonic larval stage that drifts downstream to a nursery area (e.g., lake, large river, or estuary), followed by an upriver movement pattern. Due to these characteristics, Elwha River dam removal and loss of the reservoirs may have had important effects on these two sculpin species. We sampled sculpins with longitudinal electrofishing surveys in 2018 and 2019 to evaluate their current distribution, relative abundance, and body size. These metrics were generally similar to other river systems in the Pacific Northwest, with fewer and larger migratory sculpins upstream. Additionally, we compared our findings to pre-dam surveys. After dam removal, sculpins in upstream reaches were less abundant and had a smaller range of sizes. This suggests the population characteristics of sculpins in the Elwha River has changed, but it is unclear how indirect effects, such as anadromous salmonid (Salmonidae) increases, may influence their overall abundance. This study also provides a baseline to monitor sculpin population changes in the future.
两座水电大坝拆除后,埃尔瓦河流域雕塑的分布、相对丰度和长度
摘要大坝的拆除往往对许多鱼类,特别是洄游鱼类产生积极影响。相比之下,缺乏关于对较少迁徙物种的影响的信息。2011年至2014年,华盛顿州埃尔瓦河拆除了两座水电站大坝,导致两座水库损失。由于冰川历史的原因,埃尔瓦河水系有一个不成熟的淡水鱼类区系,只包括两种双鱼(海岸范围双鱼[Cottus aleuticus]和多刺双鱼[C.asper])。这两个物种都表现出类似的迁徙生活史策略,包括浮游幼虫阶段,向下游漂移到苗圃区域(如湖泊、大河或河口),然后是上游移动模式。由于这些特点,埃尔瓦河大坝的拆除和水库的损失可能对这两种双桨鹬产生了重要影响。我们在2018年和2019年对双桨进行了纵向电铸调查,以评估它们的当前分布、相对丰度和体型。这些指标通常与太平洋西北部的其他河流系统相似,上游的洄游双桨越来越少,越来越大。此外,我们将我们的调查结果与大坝前的调查结果进行了比较。大坝拆除后,上游河段的双桨数量较少,大小范围较小。这表明埃尔瓦河双鱼的种群特征已经发生了变化,但尚不清楚间接影响,如溯河产卵鲑科的增加,可能会如何影响它们的总体丰度。这项研究也为监测未来双桨种群的变化提供了一个基线。
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来源期刊
Northwest Science
Northwest Science 环境科学-生态学
CiteScore
1.30
自引率
0.00%
发文量
23
审稿时长
>36 weeks
期刊介绍: The pages of Northwest Science are open to original and fundamental research in the basic, applied, and social sciences. All submissions are refereed by at least two qualified peer reviewers. Papers are welcome from authors outside of the Pacific Northwest if the topic is suitable to our regional audience.
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