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首页> 外文期刊>Limnology >Distribution of freshwater macroinvertebrates in streams with dams and associated reservoirs on a subtropical oceanic island off southern Japan
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Distribution of freshwater macroinvertebrates in streams with dams and associated reservoirs on a subtropical oceanic island off southern Japan

机译：日本南部一个亚热带海洋岛上带有坝和相关水库的溪流中淡水大型无脊椎动物的分布

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摘要

The conservation of endemic fauna in freshwater ecosystems is a topical issue on small oceanic islands. Because these endemics have limited distributions, they are more vulnerable to extinction. This study is the first to clarify the distribution of freshwater macroinvertebrates including endemic and alien species in streams with dams and associated reservoirs on the Ogasawara Islands in the northwestern Pacific Ocean. In 2007, we conducted a field survey in streams and reservoirs of the Yatsuse River system and collected 22 taxonomic groups from 13 stations. Hierarchal cluster analysis and non-metric multi-dimensional scaling (NMDS) were performed for the presence/absence data of the macroinvertebrates, and the results indicated that (1) most of endemic species were present in inlet streams of dam reservoirs, (2) these endemic species were absent in the bottom sediments of the reservoirs because of oxygen depletion and (3) dams may be barriers to the migration of some species of amphidromous crustaceans. Because human modifications, such as dams and associated reservoirs, on a small oceanic island can rapidly result in fragmentation or loss of freshwater habitats of endemic species, the remaining habitat of these species, such as headwater streams, must be protected and preserved to avoid species extinction.
机译：在小海洋岛屿上，淡水生态系统中特有动物区系的保护是一个热门话题。由于这些地方病分布有限，因此更容易灭绝。这项研究是第一个阐明西北太平洋小ara原群岛上带有坝和相关水库的溪流中包括特有和外来物种在内的淡水大型无脊椎动物的分布。 2007年，我们对Yatsuse河水系的河流和水库进行了实地调查，并从13个站点收集了22个生物分类群。对大型无脊椎动物的有/无数据进行了层次聚类分析和非度量多维标度（NMDS），结果表明（1）大多数特有物种都存在于大坝水库的进水口中，（2）由于缺氧，这些特有物种在水库底部沉积物中不存在；（3）水坝可能成为某些两栖甲壳类动物迁徙的障碍。由于在一个小海洋岛上的人类改造（例如水坝和相关的水库）会迅速导致特有物种的淡水生境破碎化或丧失，因此，必须保护和保护这些物种的其余生境（如源头水流），以避免发生物种灭绝。

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