Selective Predation on Wing Morphology in Sympatric Damselflies
Selective Predation on Wing Morphology in Sympatric Damselflies
复制标题
同域豆娘翅膀形态的选择性捕食
DOI：
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发表时间：
2007
影响因子：
2.9
通讯作者：
Magne Friberg
中科院分区：
文献类型：
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作者：
E. Svensson;Magne Friberg
尽管捕食被认为会影响物种分化，但捕食者介导的自然选择对物种分化和非适应性辐射的影响却很少被研究。 Calopteryx 豆娘的翅膀黑化在性选择、种间相互作用以及物种识别中具有重要功能。 Calopteryx 属和其他豆娘属也被提出作为性选择驱动辐射的例子。我们表明，鸟类捕食强烈影响该属的两个同属和同域物种（Calopteryx splendens 和 Calopteryx virgo）的翅膀形态和雄性翅膀黑色化的自然选择。处女座锦鲤的翅膀黑化程度较夸张，其被捕食风险几乎是同域同源锦鲤的三倍。对过度繁殖的处女座物种的选择性捕食有利于翅膀黑色素斑块的减少和重新分布。有证据表明，芨芨草存在涉及翼斑大小、翼斑暗度以及翼长和宽度的非线性选择，但处女座翼斑对相同性状组合的非线性选择较弱。选择性捕食可能会通过性选择干扰物种分化，从而间接影响该属的雄性种间相互作用、生殖隔离和物种共存。
Although predation is thought to affect species divergence, the effects of predator‐mediated natural selection on species divergence and in nonadaptive radiations have seldom been studied. Wing melanization in Calopteryx damselflies has important functions in sexual selection and interspecific interactions and in species recognition. The genus Calopteryx and other damselfly genera have also been put forward as examples of radiations driven by sexual selection. We show that avian predation strongly affects natural selection on wing morphology and male wing melanization in two congeneric and sympatric species of this genus (Calopteryx splendens and Calopteryx virgo). Predation risk was almost three times higher for C. virgo, which has an exaggerated degree of wing melanization, than it was for the less exaggerated, sympatric congener C. splendens. Selective predation on the exaggerated species C. virgo favored a reduction and redistribution of the wing melanin patch. There was evidence for nonlinear selection involving wing patch size, wing patch darkness, and wing length and width in C. splendens but weaker nonlinear selection on the same trait combinations in C. virgo. Selective predation could interfere with species divergence by sexual selection and may thus indirectly affect male interspecific interactions, reproductive isolation, and species coexistence in this genus.