Short-distance spawning migration of tropical freshwater eels
Short-distance spawning migration of tropical freshwater eels
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DOI：
10.2307/1543500
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发表时间：
2003-02-01
影响因子：
1.6
通讯作者：
Tsukamoto, K
中科院分区：
文献类型：
--
作者：
Aoyama, J;Wouthuyzen, S;Tsukamoto, K
淡水鳗鱼吸引了生物学家，因为它们在淡水栖息地和远在海洋中的产卵区之间壮观的长距离迁徙（1，2，3）。淡水鳗鱼的分子生物学的最新进展表明，它们起源于热带地区（4），有关热带物种的生殖生态和补充的信息将为淡水鳗鱼产卵迁移的演变提供新的见解（5，6）。然而，许多同域分布的热带物种的幼虫（leptocephali）在形态上相似，因此不可能识别它们，因此它们的产卵区几乎是未知的。然而，最近，我们从印度尼西亚苏拉威西岛附近采集到了小型的细头鳗，并利用物种特异性遗传标记将它们鉴定为安圭拉西里伯斯和安圭拉的幼虫。这提供了关于这些热带鳗鱼的一般产卵区的第一个明确的信息。此外，还发现了A.在Tomini湾发现的两个物种celebesensis和在西里伯斯海发现的两个物种的小标本表明，与温带鳗鱼的长途迁徙相反，热带鳗鱼在其淡水栖息地附近的地区产卵的迁徙时间要短得多。这种迁移行为的差异可能反映了淡水鳗鱼从热带到温带地区的进化梯度。
The freshwater eels have fascinated biologists because of their spectacular long-distance migrations between their freshwater habitats and their spawning areas far out in the ocean (1, 2, 3). Recent progress on the molecular phylogeny of freshwater eels suggests that they originated in the tropics (4), and information on the reproductive ecology and recruitment of tropical species will provide new insight into the evolution of the spawning migration of the freshwater eels (5, 6). However, the larvae (leptocephali) of the many sympatric tropical species are morphologically similar (7), so they are impossible to identify, and their spawning areas are thus virtually unknown. Recently, however, we have collected small leptocephali from around Sulawesi, Indonesia, and have used species-specific genetic markers to identify them as larvae of Anguilla celebesensis and A. borneensis, which provides the first definitive information about the general spawning areas of these tropical eels. Moreover, the discovery of a spawning area of A. celebesensis in Tomini Bay and the presence of small specimens of two species in the Celebes Sea indicate that, in contrast to the long migrations made by temperate eels, tropical eels make much shorter migrations to spawn in areas near their freshwater habitats. This difference in migratory behavior may reflect an evolutionary cline among freshwater eels that extends from tropical to temperate regions.