Size-assortative pairing in Gammarus pulex (Crustacea: Amphipoda): a test of the prudent choice hypothesis
Size-assortative pairing in Gammarus pulex (Crustacea: Amphipoda): a test of the prudent choice hypothesis
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DOI：
10.1016/j.anbehav.2010.01.002
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发表时间：
2010-04
期刊：
影响因子：
2.5
通讯作者：
N. Franceschi;J. Lemaitre;F. Cézilly;L. Bollache
中科院分区：
文献类型：
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作者：
N. Franceschi;J. Lemaitre;F. Cézilly;L. Bollache
积极主动的交配是动物界普遍存在的现象。已经提出了几种假设来解释自然种群中的这种生殖模式，但越来越多的证据表明，选择性交配往往是由性交配偏好造成的。最近，条件依赖的配偶选择在面对昂贵的竞争配偶已被提出来解释自然种群中的竞争性交配。竞争能力的变化可能会导致择偶偏好的强度和方向的变化，如果低质量的竞争者不那么挑剔，或者如果高质量的雄性和雌性首先配对，留下低质量的个体在他们之间形成配对，那么就导致个体质量的竞争性交配。我们调查的基础上，在不同的竞争能力和大小依赖的成本在端足类Gammarus pulex交配守卫行为的个人的偏好。我们的研究结果表明，一个未配对的男性接近一对可以诱导压力，可以导致对分离。然而，没有观察到直接接管。在我们的一系列雄性择偶实验中，在低、高或模拟竞争水平下，小雄性都会做出类似的选择。我们的研究结果表明，收购的频率，更普遍的干扰竞争，可以被认为是不足以诱导减少在这个人口中的大女性的偏好，因此不太可能解释大小不稳定的交配。
Positive assortative mating is a widespread phenomenon in the animal kingdom. Several hypotheses have been proposed to explain this reproductive pattern in natural populations, but growing evidence suggests that assortative mating most often results from sexual mating preferences. Recently, condition-dependent mate choice in the face of costly competition for mates has been proposed to explain assortative mating in natural populations. Variation in competitive ability may generate variation in both the strength and the direction of mate preference, resulting in assortative mating with respect to individual quality if low-quality competitors are less choosy, or if high-quality males and females pair up first, leaving low-quality individuals to form pairs between themselves. We investigated individuals' preferences for mates on the basis of differential competitive abilities and size-dependent costs in mate-guarding behaviour in the amphipod Gammarus pulex. Our results show that the presence of an unpaired male close to a pair can induce stress that can lead to pair separation. However, no direct take-over was observed. In our series of male mate choice experiments, under low, high or simulated levels of competition, small males made similar choices. Our results suggest that the frequency of take-overs, and more generally interference competition, can be considered insufficient to induce a reduced preference for large females in this population, and is thus unlikely to explain size-assortative mating.