Obligately silent males sire more offspring than singers in a rapidly evolving cricket population
Obligately silent males sire more offspring than singers in a rapidly evolving cricket population
复制标题
在快速进化的蟋蟀种群中，绝对沉默的雄性比歌手生育更多的后代
作者：
Justa L. Heinen‐Kay;Ellen M. Urquhart;M. Zuk
性特征如何在野外获得和丧失仍然是进化生物学中的一个重要问题。夏威夷的太平洋田蟋蟀（Teleogryllus oceanicus）为实时研究促进性信号进化丧失的因素提供了前所未有的机会。来自声学定向寄生蝇的自然选择推动了一种新颖的、沉默的雄性变体的快速进化。虽然沉默的（平翅）雄性可以免受苍蝇的侵害，但它们在吸引配偶方面却面临困难。我们测试了后代产量的变化与受平翅传播影响的三个雄性属性的关系：翅膀形态（平翅或正常翅）、年龄（平翅应该比歌手存活得更久）以及在饲养过程中接触鸣叫声（有许多平翅翅的野生种群缺乏环境鸣叫声）。在每次交配活动中，平翅鸟比歌手生出更多的后代，而且当出现标准的求爱歌曲时，年长的雄性平翅鸟会更快地被雌性飞上马。尽管先前的研究表明雄性年龄和听觉体验会影响与受精相关的精子特征，但年龄和歌曲暴露对每次交配的雄性后代产量没有影响。这是第一个证据，证明沉默的雄性变体拥有生殖优势，可能有助于弥补交配前吸引交配的障碍。
How sexual traits are gained and lost in the wild remains an important question in evolutionary biology. Pacific field crickets (Teleogryllus oceanicus) in Hawaii provide an unprecedented opportunity to investigate the factors facilitating evolutionary loss of a sexual signal in real time. Natural selection from an acoustically orienting parasitoid fly drove rapid evolution of a novel, silent male morph. While silent (flatwing) males enjoy protection from the fly, they face difficulty attracting mates. We tested how offspring production varies in association with three male attributes affected by the spread of flatwing: wing morph (flatwing or normal-wing), age (flatwings should survive longer than singers) and exposure to calling song during rearing (wild populations with many flatwings lack ambient calling song). Per mating event, flatwings sired more offspring than singers and older males were mounted more quickly by females when presented with standard courtship song. Despite prior work showing that male age and acoustic experience influence sperm characteristics associated with fertilization, age and song exposure had no influence on male offspring production per mating. This represents the first evidence that the silent male morph possesses a reproductive advantage that may help compensate for precopulatory barriers to mate attraction.
影响因子：
23.8
作者：
Avila FW;Sirot LK;LaFlamme BA;Rubinstein CD;Wolfner MF
通讯作者：
Wolfner MF
影响因子：
8.8
作者：
Pascoal, Sonia;Liu, Xuan;Bailey, Nathan W.
通讯作者：
Bailey, Nathan W.