Identification of Asteroid Genera With Species Capable of Larval Cloning
Identification of Asteroid Genera With Species Capable of Larval Cloning
复制标题
鉴定小行星属与能够克隆幼虫的物种
DOI：
10.2307/1543596
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
G. Wray
中科院分区：
文献类型：
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作者：
K. Knott;E. Balser;W. Jaeckle;G. Wray
幼虫的无性繁殖，即幼虫克隆，是最近认识到的小行星复杂生命史的一个组成部分。我们比较DNA序列的线粒体tRNA基因（Ala，Leu，Asn，Pro和Gln）从幼虫的克隆过程中收集的领域与已知物种的成年人的序列，以确定小行星类群能够克隆。相邻连接分析确定了四个不同的幼虫组，每个组没有，或很少，序列分歧（p距离范围从0.00000到0.02589），因此，我们得出结论，每个幼虫组最有可能代表一个单一的物种。这些现场收集的幼虫不能确定的物种与肯定，但密切的组合已知类群与四个幼虫组表明属或家族的身份。我们可以把这里发现的两个幼虫群归为Luidia属和Oreaster属，另外两个归为Ophidiopteridae科。这项研究是第一个确定现场收集的克隆小行星幼虫，并提供证据表明，幼虫克隆是在小行星内广泛传播。此外，我们注意到，在能够克隆的物种中，克隆经常以多种方式发生，强调需要进一步调查幼虫克隆在小行星生态和进化中的作用。
Asexual reproduction in larvae, larval cloning, is a recently recognized component of the complex life histories of asteroids. We compare DNA sequences of mitochondrial tRNA genes (Ala, Leu, Asn, Pro, and Gln) from larvae in the process of cloning collected in the field with sequences from adults of known species in order to identify asteroid taxa capable of cloning. Neighbor-joining analysis identified four distinct groups of larvae, each having no, or very little, sequence divergence (p distances ranging from 0.00000 to 0.02589); thus, we conclude that each larval group most likely represents a single species. These field-collected larvae cannot be identified to species with certainty, but the close assemblage of known taxa with the four larval groups indicates generic or familial identity. We can assign two of the larval groups discerned here to the genera Luidia and Oreaster and another two to the family Ophidiasteridae. This study is the first to identify field-collected cloning asteroid larvae, and provides evidence that larval cloning is phylogenetically widespread within the Asteroidea. Additionally, we note that cloning occurs regularly and in multiple ways within species that are capable of cloning, emphasizing the need for further investigation of the role of larval cloning in the ecology and evolution of asteroids.