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首页> 外文期刊>Zoological Science >Ayu (Plecoglossus altivelis) in a Contact Zone Between Amphidromous and Landlocked Forms: Genetic Analyses of Populations in theYodo River System
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Ayu (Plecoglossus altivelis) in a Contact Zone Between Amphidromous and Landlocked Forms: Genetic Analyses of Populations in theYodo River System

机译：两栖和内陆形式之间接触区域中的Ayu（Plecoglossus altivelis）：淀江河系人口的遗传分析

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摘要

The migratory fish ayu, Plecoglossus altivelis, has two forms: an amphidromous form found throughout the Japanese islands and a landlocked form found in Lake Biwa. Because Lake Biwa is one of the sources of the Yodo River, which flows into Osaka Bay, it is likely that there has been contact between the two forms within the Yodo River system. To examine the effects of such contact, 573 ayu were collected from the Yodo River system and several other rivers and compared through an extensive investigation of microsatellite genotyping. Multivariate and individual admixture analyses of microsatellite data showed that samples of upstream migrants collected from the Yodo River in May 2003 included many individuals assigned to the amphidromous form, although fish collections in June and July 2003 were primarily composed of individuals of the landlocked form. Samples of drifting larvae, which we considered to be derived from eggs spawned in the Yodo River system, were mostly assigned to the amphidromous form. These results imply that an indigenous population of the amphidromous form exists and reproduces in the Yodo River system. It is likely that upstream migrants of the landlocked Lake Biwa form are supplied annually as well-developed larvae drifting out from Lake Biwa, but contribute very little to the next generation.
机译：迁徙鱼香鱼（Plecoglossus altivelis）有两种形式：遍布日本各岛的两栖动物形式和在琵琶湖发现的内陆形式。由于琵琶湖是流入大阪湾的淀河的发源地之一，所以淀河系统中的两种形态之间可能存在接触。为了检验这种接触的影响，从淀河系统和其他数条河流中收集了573香玉，并通过对微卫星基因型的广泛研究进行了比较。对微卫星数据的多变量和个体混合分析表明，尽管2003年6月和2003年7月的鱼类采集主要由内陆型个体组成，但2003年5月从淀河采集的上游移民样本包括许多被指定为两栖类的个体。我们认为漂流幼虫的样品（大部分被认为是两栖类）被认为是从淀河系统产卵而来的。这些结果表明，存在于两栖类中的原住民在淀河系统中繁殖。内陆琵琶湖形态的上游移民很可能每年都从琵琶湖中漂出来的成熟幼虫被供应，但对下一代的贡献很小。

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