Sexual selection determines parental care patterns in cichlid fishes
Sexual selection determines parental care patterns in cichlid fishes
复制标题
DOI：
10.1111/j.1558-5646.2008.00426.x
复制
发表时间：
2008-08-01
期刊：
影响因子：
3.3
通讯作者：
Kolm, Niclas
中科院分区：
文献类型：
--
作者：
Gonzalez-Voyer, Alejandro;Fitzpatrick, John L.;Kolm, Niclas
尽管进行了大量的研究工作，但我们对为什么大多数脊椎动物中雄性竞争配偶和雌性照顾后代的理解仍然不完整。有两种假说被提出来解释父母的照顾和性选择之间的因果关系的方向。传统上，性选择被解释为相对父母投资的结果，其中性别投资较少将竞争性别投资更多。然而，最近的一个模型表明，父母的照顾模式的结果从性选择作用于一个性别有利于交配竞争和较低的父母投资。使用物种水平上的比较分析Tanganyikan慈鲷鱼，我们测试了这些替代假设采用代理的基础上交配系统，性二色性和二型性数据的性选择。首先，在控制女性生殖投资的同时，我们发现，具有强烈性选择的物种与女性只照顾，而具有适度性选择的物种与双亲照顾。其次，使用权变分析，我们发现，与传统观点相反，父母照顾类型的进化变化取决于性选择的强度。因此，我们的研究结果支持这一假设，性选择决定父母照顾模式在Tanganyikan慈鲷鱼。
Despite a massive research effort, our understanding of why, in most vertebrates, males compete for mates and females care for offspring remains incomplete. Two alternative hypotheses have been proposed to explain the direction of causality between parental care and sexual selection. Traditionally, sexual selection has been explained as a consequence of relative parental investment, where the sex investing less will compete for the sex investing more. However, a more recent model suggests that parental care patterns result from sexual selection acting on one sex favoring mating competition and lower parental investment. Using species-level comparative analyses on Tanganyikan cichlid fishes we tested these alternative hypotheses employing a proxy of sexual selection based on mating system, sexual dichromatism, and dimorphism data. First, while controlling for female reproductive investment, we found that species with intense sexual selection were associated with female-only care whereas species with moderate sexual selection were associated with biparental care. Second, using contingency analyses, we found that, contrary to the traditional view, evolutionary changes in parental care type are dependent on the intensity of sexual selection. Hence, our results support the hypothesis that sexual selection determines parental care patterns in Tanganyikan cichlid fishes.