Can behaviour impede evolution? Persistence of singing effort after morphological song loss in crickets
Can behaviour impede evolution? Persistence of singing effort after morphological song loss in crickets
复制标题
行为会阻碍进化吗？
作者：
Jack G. Rayner;W. Schneider;N. Bailey
性信号的进化丧失是普遍的。检查与这些信号相关的行为的后果可以深入了解促进或抑制性状丧失的因素。我们测试了夏威夷蟋蟀（Teleogryllus oceanicus）沉默种群中性特征的行为组成部分（雄性叫声）是否在进化中减少。蟋蟀的歌声需要耗费大量精力的翅膀运动，但“平翅”雄鸟的翅膀雌性化了，可以阻止歌声，防止致命的窃听寄生虫。Flatwing男性表达翅膀运动模式与唱歌，但与正常的翅膀男性相比，持续的翅膀运动不能赋予性选择的好处，应该受到强烈的负面选择。我们开发了一种自动化技术来量化雄性花多长时间表达与歌曲相关的翅膀运动。我们比较了夏威夷蟋蟀种群中不同比例的沉默男性和男性变体之间的呼叫努力。与预期相反，沉默的人群在呼叫努力方面的投入与非沉默人群一样多。此外，来自同一种群的平翅和正常翅雄性在呼叫努力方面没有差异。沉默的夏威夷蟋蟀在形态变化后缺乏进化的行为调整，说明了行为有时可能会阻碍，而不是促进进化。
Evolutionary loss of sexual signals is widespread. Examining the consequences for behaviours associated with such signals can provide insight into factors promoting or inhibiting trait loss. We tested whether a behavioural component of a sexual trait, male calling effort, has been evolutionary reduced in silent populations of Hawaiian field crickets (Teleogryllus oceanicus). Cricket song requires energetically costly wing movements, but ‘flatwing’ males have feminized wings that preclude song and protect against a lethal, eavesdropping parasitoid. Flatwing males express wing movement patterns associated with singing but, in contrast with normal-wing males, sustained periods of wing movement cannot confer sexual selection benefits and should be subject to strong negative selection. We developed an automated technique to quantify how long males spend expressing wing movements associated with song. We compared calling effort among populations of Hawaiian crickets with differing proportions of silent males and between male morphs. Contrary to expectation, silent populations invested as much in calling effort as non-silent populations. Additionally, flatwing and normal-wing males from the same population did not differ in calling effort. The lack of evolved behavioural adjustment following morphological change in silent Hawaiian crickets illustrates how behaviour might sometimes impede, rather than facilitate, evolution.
尽管强烈的性选择有利于唱歌的雄性，但田间蟋蟀的性信号丢失仍然存在
影响因子：
3.3
作者：
Tanner, Jessie C.;Swanger, Elizabeth;Zuk, Marlene
通讯作者：
Zuk, Marlene
影响因子：
2.6
作者：
Foucault, Quentin;Wieser, Andreas;Pfenninger, Markus
通讯作者：
Pfenninger, Markus