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首页> 外文期刊>Zoological Science >Variation and Abnormality of Genital System in Littorina sitkana Philippi (Mollusca, Gastropoda) in Northern Japan
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Variation and Abnormality of Genital System in Littorina sitkana Philippi (Mollusca, Gastropoda) in Northern Japan

机译：日本北部小百合（Littorina sitkana Philippi）（软体动物，腹足纲）生殖系统的变异和异常

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摘要

The anatomy of Littorina sitkana was examined using specimens from nine localities in northern Japan. These localities are known to be genetically clustered into two geographic groups; the first group consists of localities on the northern coast of Hokkaido along the Seas of Japan and Okhotsk and the second one comprises localities on the Pacific coasts of Hokkaido and Honshu. Anatomical surveys revealed that the mean numbers of penial glands differ significantly between the northern and Pacific sites, in correlation with the genetic variation. On the other hand, the mean relative size of the capsule gland within the pallial oviduct was positively correlated with mean sea-surface temperature, almost independently of the genetic difference. In addition, imposex was found for the first time in L. sitkana. Females frequently lacked the capsule gland in the imposex-present populations.The mean relative size of capsule gland to the whole pallial oviduct was significantly small there than in the imposex-free populations. The number of penial glands in males tended to be small in the imposex-present populations. The penis of imposex females was much shorter than that of males, in contrast to Nucella species occurring sympatrically on these coasts, in which the female penis is nearly as long as the male one. Although the pallial oviduct is reported to be replaced by a prostate gland in imposex females of Littorina littorea, such replacement was not found in any imposex female of L. sitkana.
机译：使用日本北部九个地方的标本检查了Littorina sitkana的解剖结构。众所周知，这些地方在遗传上被分为两个地理区域。第一组包括日本海和鄂霍次克海北海道北部海岸的地区，第二组包括北海道和本州太平洋海岸的地区。解剖学调查显示，北部和太平洋地区的平均腺体数目与遗传变异有关。另一方面，胆囊输卵管内囊腺的平均相对大小与平均海表温度呈正相关，几乎与遗传差异无关。此外，imposex首次在L. sitkana被发现。女性在有内脏的人群中经常缺乏荚膜腺。与无内脏的人群相比，内囊相对于整个输卵管的平均相对大小要小得多。在有性行为的人群中，男性的阴茎数量很少。与在这些海岸上同伴发生的努切拉菌种相比，雌雄不育的雌性阴茎比雄性短，而雌性阴茎的长度几乎与雄性长。尽管据报道，在Littorina littorea的雌性雌性中，卵囊输卵管被前列腺代替，但在L. sitkana的任何雌性雌性中均未发现这种替代。

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