Influences of early habitat use on the migratory plasticity and demography of Japanese eels in central Japan
Influences of early habitat use on the migratory plasticity and demography of Japanese eels in central Japan
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早期栖息地利用对日本中部日本鳗鱼洄游可塑性和种群数量的影响
DOI：
10.1016/j.ecss.2012.05.009
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发表时间：
2012
影响因子：
2.8
通讯作者：
K. Tsukamoto
中科院分区：
文献类型：
--
作者：
K. Yokouchi;N. Fukuda;Michael J. Miller;J. Aoyama;F. Daverat;K. Tsukamoto
通过对来自日本中部滨名湖系统的 172 条银鳗的耳石 Sr:Ca 比率发现，它们进入淡水的时间是影响日本鳗鱼 (Anguilla japonica) 在其早期生长阶段是否离开淡水的重要因素。研究发现，鳗鱼在生长阶段的迁徙和栖息地利用方面具有高度的表型可塑性，鳗鱼生活在淡水和河口水中或在淡水和河口水中移动。在进入淡水的鳗鱼总数的 59% 中，其中 23% 在大约 2 年内又回到了咸水湖。河流居民中雌性的比例较高，但不同迁徙类型之间在体型、年龄或产卵迁徙开始时的生长情况没有显着差异。最早进入淡水的鳗鱼似乎没有回到湖中，并且在招募时经历最高盐度的鳗鱼似乎也没有进入淡水。然而，大部分到达淡水的鳗鱼后来又回到了湖里。这表明，到达淡水的时间可能是决定哪些进入淡水的鳗鱼将留在那里以及哪些会使栖息地转移回河口栖息地的重要因素。
The timing of their entry into freshwater was found using otolith Sr:Ca ratios of 172 silver eels from the Hamana Lake system of central Japan, to be an important factor affecting whether or not Japanese eels (Anguilla japonica) later leave freshwater during their early growth phase. A high degree of phenotypic plasticity in migration and habitat use during their growth phase was found, with eels living in, or moving between, both freshwater and estuarine water. Of the 59% of the total eels that entered freshwater, 23% of those moved back to the brackish water lake within about 2 years. A higher proportion of river residents were females, but there were no significant differences in size, age, or growth at the start of their spawning migration among the different migratory types. None of the earliest eels to move into freshwater appeared to move back into the lake, and none of the eels that experienced the highest salinities at the time of recruitment appeared to enter freshwater. However, a large proportion of eels that arrived in freshwater later returned to the lake. This suggested that timing of arrival into freshwater may be an important factor determining which eels entering freshwater will remain there and which will make habitat shifts back to estuarine habitat.
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DOI：
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发表时间：
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期刊：
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