Anguillid eels as a surrogate species for conservation of freshwater biodiversity in Japan
Anguillid eels as a surrogate species for conservation of freshwater biodiversity in Japan
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鳗鱼作为日本淡水生物多样性保护的替代物种
DOI：
10.1038/s41598-020-65883-4
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发表时间：
2020
影响因子：
4.6
通讯作者：
Kaifu K
中科院分区：
文献类型：
--
作者：
Itakura H;Wakiya R;Gollock M;Kaifu K
为了监测和管理生物多样性，在保护资源集中于有限数量的焦点生物的情况下，提出了替代物种（即指示物种、伞物种和旗舰物种）。利用从日本大陆和奄美大岛的 6 条河流的 78 个地点获得的数据，我们证明了两种鳗鱼——日本鳗鱼 (Anguilla japonica) 和巨型斑驳鳗鱼 (A. marmorata)——可以作为淡水生物多样性保护的替代物种。鳗鱼是地形分布最广的物种，范围从河口附近到河流上游。此外，稳定同位素分析表明，鳗鱼可能是淡水生态系统中最高阶的捕食者之一。发现鳗鱼的密度与收集的其他产卵物种的数量之间存在显着的正相关关系。然而，最优模型显示，鳗鱼的密度和其他产卵物种的数量均与距河口的距离以及从河口到每个地点跨河建筑物的累积高度显着负相关。这表明鳗鱼密度与其他产卵物种数量之间的正相关关系是间接的，并且与河流-海洋的连通性有关。鉴于鳗鲡具有降水性的生命周期以及全球商业和文化重要性，作为一个类群，鳗鱼可以作为指示物种、保护伞物种和旗舰物种，以及淡水生物多样性保护的综合替代品。
To monitor and manage biodiversity, surrogate species (i.e., indicator, umbrella and flagship species) have been proposed where conservation resources are focused on a limited number of focal organisms. Using data obtained from 78 sites across six rivers in the mainland Japan and the Amami-Oshima Island, we demonstrate that two anguillids – the Japanese eel (Anguilla japonica) and the giant mottled eel (A. marmorata) – can act as surrogate species for conservation of freshwater biodiversity. Anguillid eels were the widest topographically-distributed species ranging from near the mouth to the upper reaches of rivers. Moreover, stable isotopic analyses indicated that eels are likely one of the highest-order predators in freshwater ecosystems. A significant positive relationship was found between the density of eels and the number of other diadromous species collected. However, the optimal models revealed that both the density of eels and the number of other diadromous species were significantly negatively correlated with distance from the river mouth and cumulative height of trans-river structures from the river mouth to each site. This suggests the positive relationship between eel density and number of other diadromous species was indirect and related to river-ocean connectivity. Given their catadromous life-cycle, and global commercial and cultural importance, as a taxa, anguillid eels can act as indicator, umbrella and flagship species, and a comprehensive surrogate for conservation of freshwater biodiversity.
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DOI：
10.1080/00288330.1989.9516334
发表时间：
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影响因子：
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