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首页> 外文期刊>Marine biology >Variation in size at sex-change among natural populations of the protandrous hermaphrodite, Crepidula fornicata (Gastropoda, Calyptraeidae)
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Variation in size at sex-change among natural populations of the protandrous hermaphrodite, Crepidula fornicata (Gastropoda, Calyptraeidae)

机译:原生质雌雄同体,Crepidula fornicata(天麻,G科)自然种群中性别变化的大小变化

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摘要

Protandrous hermaphrodites are predicted to change sex from male to female when relative reproductive fitness of females surpasses that of males. How size at sex transition varies with population, mating group and indi vidual parameters was investigated for five populations of the protandrous hermaphrodite slipper snail, Crepidula fornicata. The populations varied for density, size distri bution, average mating group size and sex ratio. Size at sex-change was correlated with the population sex ratio. Comparisons of multiple hypotheses revealed that vari ables predicting the sex of a snail vary among positions in the mating group. The variables included body size, the relative size of the snail sitting atop the focal snail and population density. Our data support the conclusions that size at sex-change (and by inference, the size at which one sex has relatively greater fitness) is not fixed for these hermaphrodites and that individual size, social conditions and population differences all influence variation in rela tive fitness.
机译:当雌性的相对生殖能力超过雄性时,原先的雌雄同体将改变性别。研究了五个种群的原形两性拖鞋蜗牛Crepidula fornicata在性别过渡时的大小如何随人口,交配群体和个人参数而变化。种群的密度,大小分布,平均交配组大小和性别比各不相同。性别变化的大小与人口性别比相关。多种假设的比较表明,预测蜗牛性别的变量在交配组中的位置各不相同。这些变量包括身体大小,位于焦点蜗牛上方的蜗牛的相对大小和种群密度。我们的数据支持以下结论:对于这些雌雄同体,性别变化的大小(并据此推论,一种性别具有相对较大的适应能力的大小)是不固定的,并且个体大小,社会条件和人口差异都会影响相对适应性的变化。

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  • 来源
    《Marine biology》 |2012年第4期|p.897-905|共9页
  • 作者单位

    Southeast Environmental Research Center,Florida International University, Miami, FL 33199, USA;

    Department of Ecology and Evolution, Stony Brook University, Stony Brook, NY 11794-5245, USA;

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  • 正文语种 eng
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