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首页> 外文期刊>Journal of Molluscan Studies >Fecundity in the hermaphroditic land snail Succinea putris (Pulmonata: Succineidae): does body size matter?
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Fecundity in the hermaphroditic land snail Succinea putris (Pulmonata: Succineidae): does body size matter?

机译：雌雄同体蜗牛的生殖力腐烂的琥珀（Pulmonata：Succineidae）：体型重要吗？

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The relative importance of body size as a factor in life-history variation is poorly understood in hermaphrodites, especially in reciprocally mating species. Succinea putris is a reciprocally mating land snail with different courtship roles, i.e. an ‘active’ individual mounts the shell of a ‘passive’ partner after which penes are intromitted simultaneously. This species was used to examine (1) the relation between individual body size and fecundity; (2) whether an individual's body size affects fecundity of the partner; (3) the relation between courtship role and fecundity; and (4) the relation between clutch size and egg weight under laboratory conditions. Simultaneously, we studied growth rate, hatching success and time budgets, as these may co-vary with fecundity. First, highly significant correlations between an individual's body size and its fecundity and between an individual's body size and the onset of egg laying were found. These effects were influenced by the relative size of the two partners in a mating pair and the effects on fecundity were observed only in passive (not active) individuals. Second, larger individuals laid heavier eggs. Third, active and passive individuals did not differ in fecundity, egg weight, the number of eggs in the first clutch, total egg weight, hatching success or onset of egg laying. Within pairs active individuals were significantly smaller than their passive partners. Finally, we found a trade-off between clutch size and egg weight. We conclude that our results are in agreement with the gender-ratio hypothesis which states that mating behaviour in hermaphrodites should be flexible and determined by the potential male and female fitness gain in each single mating interaction. Whether the observed interindividual variation in fecundity originates from body-size-dependent sex allocation needs to be studied further. A shift towards the female function as a result of sexual isolation after copulation could explain why active and passive individuals showed similar lifetime fecundities and why effects of body size on fecundity were not observed in active individuals.
机译：在雌雄同体中，尤其是在相互交配的物种中，人们很难理解身高作为生活史变异因素的相对重要性。琥珀虫是相互交配的田螺，具有不同的求爱角色，即，“主动”个体在“被动”伴侣的外壳上坐下，然后同时引入笔。该物种被用来检验（1）个体体重与生殖力之间的关系； （2）个人的身材是否影响伴侣的生育能力； （3）求爱角色与生育力之间的关系； （4）在实验室条件下离合器尺寸和蛋重之间的关系。同时，我们研究了增长率，孵化成功率和时间预算，因为这些可能与繁殖力有关。首先，发现个体的体型与其繁殖力之间以及个体的体型与产卵开始之间高度相关。这些影响受配对中两个伴侣的相对大小的影响，并且仅在被动（非主动）个体中观察到对生殖力的影响。其次，较大的个体产卵较重。第三，主动和被动的个体在繁殖力，卵重，初生离合器中的卵数，总卵重，孵化成功或产卵开始方面没有差异。在成对配对中，主动个体比被动伴侣明显要小。最后，我们在离合器尺寸和鸡蛋重量之间找到了一个折衷方案。我们得出的结论是，我们的结果与性别比例假说相符，该假说指出，雌雄同体的交配行为应灵活，并由每次单次交配互动中潜在的男性和女性适应度增加决定。观察到的个体间生殖力差异是否源自与体型有关的性别分配，还需要进一步研究。交配后性隔离导致的女性功能转变可以解释为什么主动和被动个体表现出相似的终生生殖力，以及为何在活跃个体中未观察到体重对生殖力的影响。

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  • 来源
    《Journal of Molluscan Studies》 |2010年第4期|p.376-383|共8页
  • 作者

    Lobke Dillen; Kurt Jordaens; Luc De Bruyn;

  • 作者单位

    Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;

    Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium|Royal Museum for Central Africa, Leuvensesteenweg 13, 3080 Tervuren, Belgium;

    Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium|Research Institute for Nature and Forest (INBO), Kliniekstraat 25, 1070 Brussels, Belgium;

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