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Reproductive plasticity in mole crabs, Emerita brasiliensis, in sandy beaches with contrasting morphodynamics

机译：沙质蟹（Emerita brasiliensis）在沙滩中的生殖可塑性，具有不同的形态动力学

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摘要

Ovarian macroscopical analysis, histological validation and field sampling procedures were used to evaluate the variability in reproductive traits of the mole crab Emerita brasiliensis Schmitt, 1935 (Decapoda: Hippidae) in two exposed sandy beaches of Uruguay with contrasting morphodynamics. All developmental stages involved in the complex life cycle exhibited lower abundance, individual size and temporal occurrence in a harsh reflective beach, compared with a more benign dissipative environment. In addition, this population showed more compressed events of the reproductive cycle (e.g oogene-sis, encounter of potential mate and female parental care) and recruitment period. However, the beginning of the vitellogenesis, ovary maturity, male sexual differentiation and ending of spermatogenesis occurred at smaller sizes under dissipative conditions. These results disagree with the recent findings of delayed sexual maturity in dissipative beaches. We postulate that, in dissipative conditions, high food availability might allow an overlapping of reproductive and moulting processes, and thus females may reach optimum size and sexual maturity with fewer moults than in reflective beaches. Hence, reproductive responses must be considered not only in relation to environmental harshness, but also in the context of life history traits and their phylogenetic and allometric constraints.
机译：卵巢宏观分析，组织学验证和田间采样程序用于评价乌拉圭两个裸露沙滩中the蟹Emerita brasiliensis Schmitt，1935（Decapoda：Hippidae）生殖特征的变异性，并具有不同的形态动力学。与较温和的耗散环境相比，复杂生命周期中的所有发育阶段在苛刻的反射海滩上均显示出较低的丰度，个体大小和时间发生。此外，该人群在生殖周期（例如卵子发生，可能的伴侣和女性父母的照料）中表现出更多的受压事件。然而，在耗散条件下，卵黄发生的开始，卵巢的成熟，男性的性别分化和精子发生的结束发生在较小的大小。这些结果与耗散性海滩延迟性成熟的最新发现不一致。我们假设，在耗散条件下，高食物供应量可能会使生殖和蜕皮过程重叠，因此，与反射海滩相比，雌性可能达到最佳大小和性成熟，而蜕皮更少。因此，生殖反应不仅要考虑到环境的恶劣性，还要考虑到生活史特征及其系统发育和异向性约束。

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