Agonistic character displacement of genetically based male colour patterns across darters
Agonistic character displacement of genetically based male colour patterns across darters
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基于遗传的雄性颜色模式在蛇镖鱼之间的竞争性特征位移
DOI：
10.1098/rspb.2018.1248
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Fuller, Rebecca C.
中科院分区：
文献类型：
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作者：
Moran, Rachel L.;Fuller, Rebecca C.
当避免适应不良的种间攻击的选择导致竞争性信号和/或相关同源行为偏差的演变时，就会发生竞争性特征位移（ACD）。在这里，我们测试了蛇鲈（鲈科：Etheostoma）雄性颜色模式中与 ACD 一致的模式。在一些蛇鲈物种中，雄性颜色模式已被证明在雄性之间的竞争中发挥作用，而不是在雌性交配偏好中发挥作用。此外，在同源性中，雄性的攻击性偏向于同种雄性，而非异种雄性，但在异域性中则不然，这与雄性行为偏差中不同的 ACD 一致。我们使用常见的花园方法来证明四种密切相关的鲈鱼物种之间的雄性颜色模式差异是基于遗传的。此外，我们证明，与两个蛇鲈物种的异域种群相比，雄性颜色模式的某些方面在同域种群中表现出更大的差异，这与 ACD 一致。然而，与异源性相比，同源性物种之间的其他雄性颜色特征更加相似，这表明并非所有信号成分都处于同源性的强烈发散选择之下。这项研究提供的证据表明，仅种间雄性之间的攻击性相互作用就可以促进物种之间和物种内复杂的雄性信号进化。我们讨论这对男性驱动的 ACD 和级联 ACD 的影响。
Agonistic character displacement (ACD) occurs when selection to avoid maladaptive interspecific aggression leads to the evolution of agonistic signals and/or associated behavioural biases in sympatry. Here, we test for a pattern consistent with ACD in male colour pattern in darters (Percidae:Etheostoma). Male colour pattern has been shown to function in male–male competition rather than female mating preferences in several darter species. Additionally, males bias their aggression towards conspecific over heterospecific males in sympatry but not in allopatry, consistent with divergent ACD in male behavioural biases. We use a common garden approach to show that differences in male colour pattern among four closely related darter species are genetically based. Additionally, we demonstrate that some aspects of male colour pattern exhibit enhanced differences in sympatric compared to allopatric populations of two darter species, consistent with ACD. However, other male colour traits are more similar between species in sympatry compared with allopatry, indicating that not all signal components are under strong divergent selection in sympatry. This study provides evidence that interspecific male–male aggressive interactions alone can promote elaborate male signal evolution both between and within species. We discuss the implications this has for male-driven ACD and cascade ACD.