Natural History Museum and Institute, Chiba, Chuo-ku, Chiba 260-8682, Japan,
The University Museum, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
Zoolog Sci. 2024 Oct;41(5):456-470. doi: 10.2108/zs230102.
We investigated geographic, genetic, and morphological variations in the intertidal limpet , a species with a broad distribution across Japan. A total of 98 specimens were obtained from 36 locations spanning the entire Japanese Archipelago, encompassing both the northern and southern regions. Examination of mitochondrial COI sequences revealed a distinct geographic genetic structure, delineating three prominent clades: (1) the Kuroshio Current, (2) the Tsushima Current, and (3) the Ryukyu-China groups. The observed geographical structuring between the Pacific and Sea of Japan side mirror patterns was noted in previously studied species, such as and . Within , the Kuroshio Current group exhibited a substantial genetic distance, reaching a maximum of 12.35%, when compared to the more closely linked Tsushima Current and Ryukyu-China groups. Compared to other groups, the Ryukyu and China groups represented relatively recent differentiations, and the former group is currently facing a heightened risk of extinction owing to its sparse population density. The emergence of intraspecific geographic structures is likely attributable to the comparatively brief planktonic larval stage, which is a common characteristic of patellogastropod limpets.
我们研究了广布于日本的潮间带帽贝的地理、遗传和形态变异。从日本列岛的 36 个地点共采集了 98 个标本，包括北部和南部地区。对线粒体 COI 序列的分析揭示了明显的地理遗传结构，分为三个主要分支：(1)黑潮，(2)对马暖流，和(3)琉球-中国群。在先前研究的物种中，如 和 ，已经观察到了太平洋和日本海侧之间的地理结构模式。在 中，与更紧密相关的对马暖流和琉球-中国群相比，黑潮群表现出较大的遗传距离，最大可达 12.35%。与其他群体相比，琉球和中国群体代表了相对较新的分化，前者由于种群密度稀疏，目前面临灭绝的高风险。种内地理结构的出现可能归因于相对短暂的浮游幼虫阶段，这是帽贝科帽贝的一个共同特征。
