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首页> 外文期刊>Ethology >Within and Between Species Variation in Male Mating Behaviors in the Mexican Sailfin Mollies Poecilicr velifera and P. petenensis
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Within and Between Species Variation in Male Mating Behaviors in the Mexican Sailfin Mollies Poecilicr velifera and P. petenensis

机译：墨西哥Sailfin Mollies Poecilicr velifera和P. petenensis男性交配行为的物种内和物种间变化

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摘要

Polymorphism in male morphology is often correlated with the expression of alternate behavioral tactics. This relationship between behavioral and morphological polymorphisms, however, is less well understood. We characterized male mating behaviors andmorphological variation within and between Poecilia velifera and P. petenensis to understand mating signal evolution in the sailfin molly lineage. In addition, we examined whether differences between these species in the size range of mature males and the strength of allometry between dorsal fin size and body length could explain the variation observed in their expression of different mating behaviors. We determined each male's mating behavior profile by observing the behavior of a single male in the presence of a receptive female. We found that P. velifera showed evidence of an alternate male mating strategy, with small males generally performing only gonopodial thrusts (forced insemination attempts) towards receptive females, while large males performed courtship displays as well as gonopodial thrusts. Males of P. petenensis performed similar rates of courtship displays and gonopodial thrusts regardless of body length. Little variation existed among populations of P. velifera in mating behaviors, while males from different populations of P. petenensis showed population-specific average rates of each mating behavior. Population differences in P. petenensis may be driven, in part, by its occurrence in more variable habitats than those occupied by P.velifera. Variation among individuals in the mating repertoire of P. velifera, but not P. petenensis, suggests that the greater range of variation in male size at maturity, as well as considerably stronger allometry between dorsal fin size and body length, may explain why males of P. velifera show the greatest degree of expression of alternate male mating behaviors when compared to other sailfin species. These results also suggest an important role of morphological polymorphisms in predicting the expression of alternate male mating behaviors.
机译：男性形态的多态性通常与其他行为策略的表达相关。然而，行为和形态多态性之间的这种关系还不太清楚。我们表征了Poecilia velifera和P. petenensis之间和之间的雄性交配行为和形态变异，以了解sailfin molly谱系中的交配信号进化。此外，我们检查了这些物种在成熟雄性大小范围内的差异以及背鳍大小与体长之间的异速结实强度之间的差异是否可以解释观察到的它们在不同交配行为中的表达差异。我们通过观察女性单身男性的行为来确定每个男性的交配行为特征。我们发现P. velifera显示出另一种雄性交配策略的证据，小雄性通常只对雌性雌性进行性生殖推力（强迫授精尝试），而大雄性进行性爱表现以及性交推力。无论体长多大，P。petenensis的雄性都表现出相似的求爱显示和性生殖力。在交配行为中，P。velifera种群之间几乎没有变化，而来自不同的P. petenensis种群的雄性表现出每种交配行为的特定种群平均速率。 petenensis的种群差异可能部分是由于其在比velifera所占据的栖息地更易变的栖息地中的发生所致。在P. velifera而不是P. petenensis的交配库中，个体之间的差异表明成熟时雄性个体的变异范围更大，而背鳍大小和体长之间的异构性也更强，这可以解释为什么雄性个体与其他风帆种类相比，维氏疟原虫显示出最大的交替雄性交配行为表达。这些结果还表明形态多态性在预测交替的雄性交配行为的表达中的重要作用。

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