Molecular phylogeny of shrimps from the genus Lysmata (Caridea: Hippolytidae): the evolutionary origins of protandric simultaneous hermaphroditism and social monogamy
Molecular phylogeny of shrimps from the genus Lysmata (Caridea: Hippolytidae): the evolutionary origins of protandric simultaneous hermaphroditism and social monogamy
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DOI：
10.1111/j.1095-8312.2008.01133.x
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发表时间：
2009-02-01
影响因子：
1.9
通讯作者：
Bauer, Raymond T.
中科院分区：
文献类型：
--
作者：
Baeza, J. Antonio;Schubart, Christoph D.;Bauer, Raymond T.
Lysmata属的虾因其广泛的生活方式，交配系统，共生伙伴关系和明显的颜色而闻名。他们可以出现在人群中（大的聚集），在小团体，或作为社会一夫一妻制对。这种虾是罕见的，如果不是唯一的甲壳类动物，因为他们不寻常的性系统。到目前为止，所有物种的性系统调查包括一个protandric同时雌雄同体：虾最初成熟和繁殖的男性，后来在生活中变成功能性的同时雌雄同体。该属内物种的进化关系尚未确定。该群体的分子生物学可能揭示这些虾独特的性和社会系统的进化起源，并有助于解决长期存在的分类学问题。使用647-bp的16 S rRNA线粒体DNA的比对，我们研究了21种虾属Lysmata从几个地理区域的系统发育关系;大西洋，太平洋和印度-太平洋。由此产生的系统发育表明该属是并系的，并且包括Exhippolysmata属。组成物种被细分为三个支持分支：一组完全由新热带物种组成;第二分支包括印度洋-太平洋和大西洋共生的鱼类清洁虾;第三分支包括来自大西洋和太平洋的热带和温带物种。这里提出的分子雌雄同体不支持一个历史的偶然性假说，以前提出的解释属内的原始同时雌雄同体的起源。此外，目前的研究表明，一夫一妻制的生活仅限于一个单系组的虾，因此可能只进化一次。(C)2009 The Linnean Society of伦敦，Biological Journal of the Linnean Society，2009，96，415-424.
Shrimps from the genus Lysmata are known because of their wide diversity of lifestyles, mating systems, symbiotic partnerships, and conspicuous coloration. They can occur in crowds (large aggregations), in small groups, or as socially monogamous pairs. Shrimps from this genus are rare, if not unique among crustaceans, because of their unusual sexual system. To date, the sexual system of all species investigated comprises a protandric simultaneous hermaphroditism: shrimps initially mature and reproduce as males and later in life turn into functional simultaneous hermaphrodites. The evolutionary relationships of the species within the genus are unsettled. A molecular phylogeny of the group may shed light on the evolutionary origins of the peculiar sexual and social systems of these shrimps and help resolve standing taxonomic questions long overdue. Using a 647-bp alignment of the 16S rRNA mitochondrial DNA, we examined the phylogenetic relationship of 21 species of shrimps from the genus Lysmata from several biogeographical regions; the Atlantic, Pacific, and Indo-Pacific. The resulting phylogeny indicates that the genus is paraphyletic and includes the genus Exhippolysmata. The constituent species are subdivided into three well supported clades: one group exclusively composed of neotropical species; a second clade comprising the Indo-Pacific and Atlantic symbiotic fish cleaner shrimps; and a third clade including tropical and temperate species from the Atlantic and Pacific. The molecular phylogeny presented here does not support a historical contingency hypothesis, previously proposed to explain the origins of protandric simultaneous hermaphroditism within the genus. Furthermore, the present study shows that monogamous pair-living is restricted to one monophyletic group of shrimps and therefore probably evolved only once. (C) 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 96, 415-424.