COEVOLUTION OF MALE MATING SIGNAL AND FEMALE PREFERENCE DURING EARLY LINEAGE DIVERGENCE OF THE HAWAIIAN CRICKET, LAUPALA CERASINA
COEVOLUTION OF MALE MATING SIGNAL AND FEMALE PREFERENCE DURING EARLY LINEAGE DIVERGENCE OF THE HAWAIIAN CRICKET, LAUPALA CERASINA
复制标题
DOI：
10.1111/j.1558-5646.2011.01278.x
复制
发表时间：
2011-08-01
期刊：
影响因子：
3.3
通讯作者：
Shaw, Kerry L.
中科院分区：
文献类型：
--
作者：
Grace, Jaime L.;Shaw, Kerry L.
性选择是一种强大的进化力量，塑造配偶选择表型，启动表型转变，导致（或加强）人口分化和物种形成时，这种转变减少交配的可能性不同的人口。在夏威夷蟋蟀属Laupala中，雄性鸣叫的脉冲频率，一个明显的交配信号，在物种之间存在差异，可能表现为一种物种形成表型。分布广泛的物种Laupala cerasina的种群显示出脉搏率的变化。我们记录了种群分化的程度，在三个功能的呼叫歌曲：脉冲率，脉冲持续时间和载波频率。所有显示出显着的人口分化，与脉搏率表现出最大的异质性。Mantel检验发现地理距离和脉率差异之间没有关系，这表明随着距离的增加而产生更大差异的简单模型不能解释观察到的分化模式。我们证明，女性的偏好函数的脉搏率是单峰的，偏好的手段表现出显着的分化种群之间。此外，脉率偏好的估计值与人群中的平均脉率显著相关，表明歌曲和偏好以逐步的方式共同进化。这种信号和偏好之间的相关分歧表明，性选择有利于建立性隔离，减少基因流，种群分化，物种形成的先决条件。
Sexual selection is a powerful evolutionary force shaping mate choice phenotypes, initiating phenotypic shifts resulting in (or reinforcing) population divergence and speciation when such shifts reduce mating probabilities among divergent populations. In the Hawaiian cricket genus Laupala, pulse rate of male calling song, a conspicuous mating signal, differs among species, potentially behaving as a speciation phenotype. Populations of the widespread species Laupala cerasina show variation in pulse rate. We document the degree of population differentiation in three features of calling song: pulse rate, pulse duration, and carrier frequency. All show significant population differentiation, with pulse rate showing the greatest heterogeneity. A Mantel test found no relationship between geographic distance and pulse rate divergence, indicating that a simple model of greater divergence with increasing distance cannot explain the observed pattern of differentiation. We demonstrate that female preference functions for pulse rate are unimodal, and that preference means show significant differentiation among populations. Furthermore, estimates of pulse rate preference correlate significantly with mean pulse rates across populations, indicating song and preference coevolve in a stepwise manner. This correlated divergence between signal and preference suggests that sexual selection facilitates the establishment of sexual isolation, reduced gene flow, and population differentiation, prerequisites for speciation.