A sex-specific trade-off between mating preferences for genetic compatibility and body size in a cichlid fish with mutual mate choice
A sex-specific trade-off between mating preferences for genetic compatibility and body size in a cichlid fish with mutual mate choice
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DOI：
10.1098/rspb.2012.0333
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发表时间：
2012-08
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影响因子：
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通讯作者：
T. Thünken;D. Meuthen;T. Bakker;S. A. Baldauf
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文献类型：
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作者：
T. Thünken;D. Meuthen;T. Bakker;S. A. Baldauf
遗传相容的交配偏好严格取决于潜在伴侣的基因类型的相互作用，在这一点上，它与观赏第二性性状的定向偏好有根本的不同。因此，最相容的伴侣通常不是拥有最明显装饰的伴侣，反之亦然。因此，交配偏好可能经常会发生冲突。在这里，我们提出了一个解决这个问题的办法，同时调查了交配偏好对亲缘关系(一种兼容性标准)和较大的身体尺寸(一种观赏或质量特征)的相互作用。在之前的实验中，当对这些标准进行单独测试时，具有共同择偶选择的慈鱼Pelvicachromis taeniatus的两性都表现出对亲戚和大块头伴侣的偏好。在目前的研究中，测试鱼被给予两个在亲缘关系和体型上不同的潜在交配伙伴之间的冲突选择，以至于无法同时满足这两个标准的偏好。我们发现，在对体型和亲缘关系的交配偏好之间，会出现一种特定性别的权衡。对于女性来说，关联性比体型更重要，而男性的情况正好相反。我们讨论了近亲交配偏好和体型之间的相互作用对近亲交配偏好进化的潜在作用。
Mating preferences for genetic compatibility strictly depend on the interplay of the genotypes of potential partners and are therein fundamentally different from directional preferences for ornamental secondary sexual traits. Thus, the most compatible partner is on average not the one with most pronounced ornaments and vice versa. Hence, mating preferences may often conflict. Here, we present a solution to this problem while investigating the interplay of mating preferences for relatedness (a compatibility criterion) and large body size (an ornamental or quality trait). In previous experiments, both sexes of Pelvicachromis taeniatus, a cichlid fish with mutual mate choice, showed preferences for kin and large partners when these criteria were tested separately. In the present study, test fish were given a conflicting choice between two potential mating partners differing in relatedness as well as in body size in such a way that preferences for both criteria could not simultaneously be satisfied. We show that a sex-specific trade-off occurs between mating preferences for body size and relatedness. For females, relatedness gained greater importance than body size, whereas the opposite was true for males. We discuss the potential role of the interplay between mating preferences for relatedness and body size for the evolution of inbreeding preference.