Genetic Isolation among Morphotypes in the Photosymbiotic Didemnid Didemnum molle (Ascidiacea, Tunicata) from the Ryukyus and Taiwan
Genetic Isolation among Morphotypes in the Photosymbiotic Didemnid Didemnum molle (Ascidiacea, Tunicata) from the Ryukyus and Taiwan
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DOI：
10.2108/zsj.27.959
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发表时间：
2010-12-01
影响因子：
0.9
通讯作者：
Hirose, Euichi
中科院分区：
文献类型：
--
作者：
Hirose, Mamiko;Nozawa, Yoko;Hirose, Euichi
Didemnum molle 是一种殖民海鞘，含有共生蓝藻原绿藻，分布在印度-西太平洋的珊瑚礁中。 D. molle 的几种形态类型通过其菌落的颜色和大小来表征。先前根据细胞色素氧化酶亚基 I (COI) 的基因序列推断的分子系统发育鉴定出日本琉球群岛多个地点的四种形态类型（即灰色、棕色、白色和大）。通过添加来自多个采集地（台湾和琉球）的 17 个标本，包括另一种形态型（小型），本报告证明了基于 COI 序列的五种形态型之间的遗传分离。在同一时间和地点采集了许多不同形态型的性成熟标本，表明形态型之间存在生殖隔离。
Didemnum molle, a colonial ascidian that harbors the symbiotic cyanophyte Prochloron spp., is distributed throughout the coral reefs of the Indo-West Pacific Ocean. Several morphotypes of D. molle are characterized by the color and size of their colonies. Previous molecular phylogeny inferred from gene sequences for the cytochrome oxidase subunit I (COI) identified four morphotypes (i.e., gray, brown, white, and large) from several sites in the Ryukyu Islands, Japan. With the addition of 17 specimens, including another morphotype (small), from several collection sites (Taiwan and the Ryukyus), the present report demonstrates genetic separation among the five morphotypes based on COI sequences. A number of sexually mature specimens of the different morphotypes were collected at the same times and sites, indicating reproductive isolation among morphotypes.