尚普兰湖流域美洲鳗鲡的分布及屏障的影响

IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Rose E. Stuart, Hannah L. Holst, J. Ellen Marsden, Jason D. Stockwell
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引用次数: 0

摘要

淡水鳗(安圭拉鳗属)的数量正在显著下降,尤其是温带地区的物种。这些下降是由于过度捕捞、栖息地退化和大坝等迁徙障碍造成的。然而,缺乏关于鳗鱼分布、栖息地利用和穿越河内屏障的能力的信息增加了管理鳗鱼的挑战。2005 - 2010年,尚普兰湖流域共放养了270万条玻璃鳗,调查了玻璃鳗的分布和丰度,重点分析了放养前后屏障对玻璃鳗的影响。数据整理自1929年至2024年的一系列来源。整个尚普兰湖及其支流都有鳗鱼的记录,包括90米深的湖泊和上游40公里的距离。在大坝上游10 m处很少观察到鳗鱼,而在多个大坝上游,无论大坝高度如何,观察到的鳗鱼都减少了。放养的鳗鱼可能扩大了该盆地中鳗鱼的总体分布,放养后从通常被认为“无法通过”的地点进行观察。数据收集在空间和时间上的不一致性给我们对鳗鱼分布的理解留下了空白,并对观察到的鳗鱼缺失的准确性造成了不确定性,这些问题可以通过未来的调查工作得到改善。我们在尚普兰湖流域的研究结果很可能可以外推到更大的圣劳伦斯河流域,在那里也发生了放养,以确定关于小支流小水坝和主要河流大水坝影响的研究和管理需求。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Distribution of American eels (Anguilla rostrata) and the influence of barriers in the Lake Champlain basin
Freshwater eels (Anguilla spp.) are experiencing significant population declines, particularly for species from temperate latitudes. These declines are attributed to overharvest, habitat degradation, and migration barriers such as dams. However, lack of information about eel distribution, habitat use, and ability to navigate in-stream barriers increases the challenge of managing eels. We investigated the distribution and abundance of eels in the Lake Champlain basin, where 2.7 million glass eels were stocked from 2005 to 2010, and focused on the influence of barriers pre- and post-stocking. Data were collated from a range of sources, from 1929 to 2024. Eels were recorded throughout Lake Champlain and its tributaries, including down to 90-m depth in the lake and distances up to 40 km upstream from the lake. Eels were rarely observed upstream of dams >10 m, and observations were reduced upstream of multiple dams, regardless of dam height. Stocked eels may be expanding the overall distribution of eels in the basin, with post-stocking observations from locations typically considered ‘impassable’. Inconsistency in data collection over space and time has left gaps in our understanding of eel distributions and creates uncertainty regarding accuracy of observed eel absences, issues which could be improved by future survey work. Our findings from the Lake Champlain basin can likely be extrapolated to the larger St Lawrence River basin, where stocking has also occurred, to identify research and management needs regarding the impacts of small dams in minor tributaries and large dams in major rivers.
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来源期刊
Journal of Great Lakes Research
Journal of Great Lakes Research 生物-海洋与淡水生物学
CiteScore
5.10
自引率
13.60%
发文量
178
审稿时长
6 months
期刊介绍: Published six times per year, the Journal of Great Lakes Research is multidisciplinary in its coverage, publishing manuscripts on a wide range of theoretical and applied topics in the natural science fields of biology, chemistry, physics, geology, as well as social sciences of the large lakes of the world and their watersheds. Large lakes generally are considered as those lakes which have a mean surface area of >500 km2 (see Herdendorf, C.E. 1982. Large lakes of the world. J. Great Lakes Res. 8:379-412, for examples), although smaller lakes may be considered, especially if they are very deep. We also welcome contributions on saline lakes and research on estuarine waters where the results have application to large lakes.
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