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首页> 外文期刊>Marine biology >Evolutionary ecology of settlement size in planktotrophic neritimorph gastropods
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Evolutionary ecology of settlement size in planktotrophic neritimorph gastropods

机译：浮游性神经怪兽腹足类动物的沉降量的进化生态学

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摘要

Body size during larval development is one of the most important attributes of aquatic animals. The optimal size for changing form or habitat may vary according to ecological traits of species, while phylogenetic constraints also play a significant role. The major goal of this study is to reveal the patterns in the settlement size of planktotrophic larvae in an archaic gastropod superorder Neritimorpha. We take advantage of the fact that size at various ontogenetic stages of neritimorphs can be rigorously estimated by measuring features of the adult opercula. This unique feature of neritimorphs has allowed us to generate the largest data set so far on larval settlement sizes within a group of marine invertebrates that recruit into very different post-metamorphic habitats. Eighty-eight species that represent most extant genera from rocky shores, seagrass beds, mangroves, estuaries, streams, submarine caves, deep-sea vents or seeps showed negligible intraspecific variation and considerable interspecific differences in settlement size, particularly between genera or families. Settlement size is determined primarily by phylogenetic constraints, while parallel evolution toward smaller sizes was shown to occur exclusively in four independent clades (two living and two extinct) of amphidromous snails with a marine larval period followed by a limnic adult phase. The smaller settlement size may possibly reduce the risk of being wafted away from the estuaries of their natal streams through less time achieving metamorphic competence, while ability to make occasional long-distance trips is retained by the presence of a sufficiently long delay period. This delay period also seems to obscure the possible correlation between settlement size and geographic distribution range of neritimorph species, both fully marine and amphidromous.
机译：幼体发育过程中的体型是水生动物最重要的属性之一。根据物种的生态特征，改变形式或栖息地的最佳大小可能会有所不同，而系统发育限制也起着重要作用。这项研究的主要目的是揭示古腹足类超序神经纲中浮游性幼虫沉降大小的模式。我们利用这样一个事实，即可以通过测量成年的特征来严格估计神经形态的各个个体发育阶段的大小。神经形态的独特特征使我们能够生成迄今为止最大的关于一组无脊椎动物的海洋无脊椎动物的数据集，这些海洋无脊椎动物吸收到了非常不同的后变态生境中。在岩石海岸，海草床，红树林，河口，溪流，海底洞穴，深海喷口或渗漏中代表最现存属的88个物种显示出微不足道的种内差异和相当大的种间差异，特别是在属或科之间。沉降的大小主要由系统发育限制决定，而向较小尺寸的平行演化仅发生在四个独立的两亲蜗牛（两个活着和两个已灭绝）中，它们具有海洋幼虫期，随后是纤毛成虫期。较小的定居点规模可能会减少获得变质能力的时间，从而减少从其出生河流的河口飘走的风险，同时由于足够长的延迟时间而保留了偶尔进行长途旅行的能力。这种延迟期似乎也掩盖了全海和两栖类神经形态物种的定居规模与地理分布范围之间的可能相关性。

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  • 来源
    《Marine biology》 |2014年第1期|213-227|共15页
  • 作者

    Hiroaki Fukumori; Yasunori Kano;

  • 作者单位

    Graduate School of Frontier Sciences, Chiba 277-8561, Japan,Department of Marine Ecosystems Dynamics, Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan;

    Department of Marine Ecosystems Dynamics, Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan;

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