Distribution of wild and stocked Japanese eels in the lower reaches of the Tone River catchment revealed by otolith stable-isotope ratios
Distribution of wild and stocked Japanese eels in the lower reaches of the Tone River catchment revealed by otolith stable-isotope ratios
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通过耳石稳定同位素比揭示利根川流域下游野生和放养日本鳗鱼的分布
DOI：
10.1111/jfb.13782
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发表时间：
2018
影响因子：
2
通讯作者：
Kimura Shingo
中科院分区：
文献类型：
--
作者：
Itakura Hikaru;Arai Kohma;Kaifu Kenzo;Shirai Kotaro;Yoneta Akihito;Miyake Yoichi;Secor David H.;Kimura Shingo
在日本高度变化的集水区，日本鳗鱼的自然发生是栖息地恢复和生态系统健康的关键措施，但这一指标可能会被共同发生的养殖鳗鱼的发生率所掩盖。野生和放养的分布。利用碳氧稳定同位素（δ18O和δ13C）研究了同江下游的日本龙耳石。我们开发了一个歧视模型，分类野生和养殖鳗鱼560人，并将其应用于鳗鱼在下游的通河流域。在这部分流域的所有研究地点都发现了野生鳗鱼，这表明该物种的自然补充发生在从河口到三级河流至少远至Imbanuma湖的地方。野生鳗鱼的比例范围从86%到100%，在河流和溪流网站，只有23%，在上游的Imbanuma湖网站。这种差异可能取决于鳗鱼是否在相应的地点附近被释放。超过50%的库存鳗鱼发生在网站附近的释放位置，表明有限的扩散养殖鳗鱼。
The natural occurrence of Japanese eelsAnguilla japonicain Japan's highly altered catchments is a critical measure of habitat restoration and ecosystem health, yet this metric may be obscured by the incidence of co‐occurring cultured eels. Distribution of wild and stockedA. japonicain the lower reaches of the Tone River cachment was investigated using otolith oxygen and carbon stable‐isotope ratios (δ18O and δ13C). We developed a discrimination model to classify wild and cultured eels for 560 individuals and applied it to eels captured in the lower reaches of the Tone River catchment. Wild eels were found at all study sites of this part of the catchment, indicating natural recruitment of the species occurred from the estuary to third‐order streams at least as far as Lake Imbanuma. The proportion of wild eels ranged from 86 to 100% at river and stream sites and was only 23% at upstream Lake Imbanuma sites. This difference probably depends on whether or not eels were released near the corresponding site. More than 50% of stocked eels occurred at sites proximate to release locations, indicating limited dispersal by cultured eels.