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首页> 外文期刊>Marine ecology progress series >Stock composition of green turtles Chelonia mydas foraging in the Ryukyu Archipelago differs with size class
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Stock composition of green turtles Chelonia mydas foraging in the Ryukyu Archipelago differs with size class

机译：在琉球群岛觅食的绿海龟Chelonia mydas的种群组成因大小等级而异

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摘要

The size composition of green turtles Chelonia mydas in their foraging grounds (FGs) in Japanese waters of the northwestern Pacific Ocean has suggested that turtles shift their FGs according to their size. To elucidate the size-related movements among FGs, we examined whether the origin of turtles differed depending on their size at 2 FGs in the Ryukyu Archipelago by performing mixed stock analysis using a 380 bp fragment of the mitochondrial DNA. At both sites, the Japanese stock primarily contributed to the 50-70 cm straight carapace length (SCL) size class, while the contribution of the southern stock from Micronesia and the Marshall Islands was higher in turtles 50 and 70 cm SCL. Since the above size-related differences in stock contribution were maintained for at least a decade, they were not attributable to the population trends in the Japanese stock. The higher contribution of the Japanese stock to the 50-70 cm SCL class suggests the possibility of juvenile natal homing by turtles from the Japanese stock, possibly from the main islands of Japan. The shift in the contribution of different stocks of origin to turtles 70 cm SCL might have resulted from the movements of turtles to settle in their adult FGs. Additionally, the present results revealed that the Ryukyus are situated at the northern limit of the FGs for turtles from southern stocks. We hypothesize that this boundary may be created by a lack of adaptation of turtles from southern stocks to northern seasonal water temperatures.
机译：在西北太平洋日本海域的觅食场中，绿海龟白斑龟的体型组成表明，海龟会根据其体型改变其海龟体。为了阐明FG之间大小相关的运动，我们通过使用线粒体DNA的380 bp片段进行混合种群分析，检查了琉球群岛2个FG处龟的起源是否因它们的大小而异。在这两个地点，日本种群主要是50-70厘米的直甲长（SCL）大小类别，而密克罗尼西亚和马绍尔群岛的南部种群在<50和> 70厘米SCL的海龟中贡献更大。由于以上与存货规模相关的规模差异至少维持了十年，因此不能归因于日本存货的人口趋势。日本种群对50-70厘米SCL级的贡献更大，表明来自日本种群（可能来自日本主要岛屿）的海龟可能会进行幼鱼成年归巢。超过70 cm SCL的海龟对不同产地的贡献的变化可能是由于海龟移动到其成年FG中所致。此外，目前的结果表明，琉球位于南部种群海龟的FG的北端。我们假设该边界可能是由于缺乏从南部种群到北部季节性水温的海龟适应而造成的。

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