Divergent warning patterns contribute to assortative mating between incipient Heliconius species
Divergent warning patterns contribute to assortative mating between incipient Heliconius species
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不同的警告模式有助于早期Heliconius物种之间的选型交配
DOI：
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发表时间：
2014
影响因子：
2.6
通讯作者：
Nicola J. Nadeau
中科院分区：
文献类型：
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作者：
R. Merrill;A. Chia;Nicola J. Nadeau
理论模型表明，不同生态选择下的性状也有助于选型交配，将促进基因流动的物种形成。这些所谓的“神奇特征”的证据现在存在于一系列分类群中。然而，它们在物种形成过程中的重要性将取决于它们对生殖隔离的贡献程度。解决这个问题需要实验来确定所涉及的确切线索，以及对野生环境中的替代性交配的估计。Heliconius蝴蝶以其明亮的警告颜色图案的多样性而闻名，它们对实验操作的顺从性为测试它们在生殖隔离中的作用提供了一个极好的机会。在这里，我们揭示了不同的颜色模式有助于早期物种Heliconius himera和H。erato，一个分类对，其中通过颜色模式的间接交配已被证明在野生个体：首先，我们表明，男性更有可能试图交配同种女性;第二，我们表明，男性更有可能接近固定的女性，分享自己的警告模式。这些数据是有价值的，因为这些类群可能代表物种形成的早期阶段，但不寻常的是，也允许在野外测量的不同生态相关表型之间的杂交繁殖率进行比较。
Theoretical models suggest that traits under divergent ecological selection, which also contribute to assortative mating, will facilitate speciation with gene flow. Evidence for these so-called “magic traits” now exists across a range of taxa. However, their importance during speciation will depend on the extent to which they contribute to reproductive isolation. Addressing this requires experiments to determine the exact cues involved as well as estimates of assortative mating in the wild. Heliconius butterflies are well known for their diversity of bright warning color patterns, and their amenability to experimental manipulation has provided an excellent opportunity to test their role in reproductive isolation. Here, we reveal that divergent color patterns contribute to mate recognition between the incipient species Heliconius himera and H. erato, a taxon pair for which assortative mating by color pattern has been demonstrated among wild individuals: First, we demonstrate that males are more likely to attempt to mate conspecific females; second, we show that males are more likely to approach pinned females that share their own warning pattern. These data are valuable as these taxa likely represent the early stages of speciation, but unusually also allow comparisons with rates of interbreeding between divergent ecologically relevant phenotypes measured in the wild.