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首页> 外文期刊>Marine biology >Transient ontogenetic expression of hermaphroditic gonad morphology within the Gobiosoma group of the Neotropical seven-spined gobies (Teleostei: Gobiidae)
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Transient ontogenetic expression of hermaphroditic gonad morphology within the Gobiosoma group of the Neotropical seven-spined gobies (Teleostei: Gobiidae)

机译：新热带七旋虎虾（Teleostei：Gobiidae）Gobiosoma组内雌雄同体性腺形态的瞬时个体发育表达。

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摘要

The Neotropical seven-spined gobies (tribe Gobiosomatini), including the Gobiosoma and Microgobius groups, constitute a speciose, monophyletic gobiid taxon. In particular, member species of the Gobiosoma group exhibit a combination of behavioral diversification and microhabitat specialization that may have played a major role in their collective rapid evolution and high rate of spe-ciation. Functional hermaphroditism, which is common among gobiids, can promote exploitation of patchily distributed micro-niches by countering potential reductions in reproductive opportunities. However, the possible role of functional hermaphroditism in the exploitation of micro-habitats and rapid speciation in the Gobiosoma group is unknown. One member species, Tigrigobius multifasciatus, is a functional hermaphrodite. Two other Gobiosoma group species are functionally gonochoric (i.e., constant-sexed), but exhibit transient hermaphroditic ovarian structure among immatures. In this study, ovarian morphology among immature and adult females of several Gobiosoma group species was examined to see if hermaphroditic gonadal features are present. Although no evidence of functional hermaphroditism in the form of precursive accessory gonadal structures (pAGS) associated with the adult ovary was found among newly examined species, all species exhibited the transient expression of hermaphroditic gonadal features associated with the immature ovary. In contrast, among six species of non-Gobiosomatini genera having no record of hermaphroditism, none exhibited similar transient hermaphroditic features associated with the immature ovary. These findings suggest that hermaphroditism may have been an ancestral trait which has been secondarily lost within some Gobiosoma group species. This study also shows that ontogenetic and morphogenic processes within the gobiid reproductive system may provide new insights into the evolution of life history traits and significantly further our understanding of the extraordinary evolutionary success of this group.
机译：包括戈比奥索马（Gobiosoma）和密戈比乌斯（Microgobius）族在内的新热带七旋虾虎（戈比索马蒂尼部落）构成了一个特殊的，单种的戈壁类群。尤其是，戈比索马群的成员物种表现出行为多样化和微生境专业化的结合，这可能在它们的集体快速进化和高专业化中发挥了重要作用。功能性雌雄同体在戈壁类动物中很常见，它可以通过对抗生殖机会的潜在减少来促进对分布不规则的小生境的利用。但是，在功能性雌雄同体在微生境的开发和快速物种形成中可能的作用尚不清楚。 Tigrigobius multifasciatus是一种成员，是一种功能性雌雄同体。其他两个Gobiosoma类物种在功能上属于淋病性（即恒定性别），但在未成熟个体中表现出短暂的两性卵巢结构。在这项研究中，检查了几种Gobiosoma组物种的未成熟和成年雌性的卵巢形态，以查看是否存在雌雄同体的性腺特征。尽管在新检查的物种中没有发现与成年卵巢相关的功能性雌雄同体形式的前兆性腺结构（pAGS），但所有物种均表现出与未成熟卵巢相关的雌雄同体性腺特征的瞬时表达。相反，在没有雌雄同体记录的非戈比索马提尼属的六个属中，没有一个表现出与未成熟卵巢相关的类似的短暂雌雄同体特征。这些发现表明，雌雄同体可能是一种祖先性状，其在某些Gobiosoma组物种中已被第二次丧失。这项研究还表明，戈壁生殖系统内的个体发生和形态发生过程可能为生活史特征的演变提供新的见解，并极大地增进了我们对该群体非凡进化成功的理解。

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  • 来源
    《Marine biology》 |2008年第6期|p.943-951|共9页
  • 作者

    Kathleen S. Cole;

  • 作者单位

    Department of Zoology, University of Hawaii at Manoa, 2835 McCarthy Mall, Honolulu, HI 96822, USA;

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  • 正文语种 eng
  • 中图分类 环境生物学;
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