Brain size evolution in pipefishes and seahorses: the role of feeding ecology, life history and sexual selection
Brain size evolution in pipefishes and seahorses: the role of feeding ecology, life history and sexual selection
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DOI：
10.1111/jeb.12995
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发表时间：
2017-01
影响因子：
2.1
通讯作者：
Masahito Tsuboi;A. C. O. Lim;B. Ooi;Mei Yee Yip;Ving Ching Chong;I. Ahnesjö;N. Kolm
中科院分区：
文献类型：
--
作者：
Masahito Tsuboi;A. C. O. Lim;B. Ooi;Mei Yee Yip;Ving Ching Chong;I. Ahnesjö;N. Kolm
脑的大小在所有的分类水平上都有很大的差异。饲养生态学、生活史和性选择被认为是产生当代脊椎动物脑大小多样性的关键因素。然而，对大脑大小进化的分析仅限于雄性主要为交配而雌性选择配偶的谱系。在这里，我们提出了第一个原始的数据集，在管鱼和海马的大脑大小（Syngnathidae）一个群体中，激烈的雌性交配竞争发生在许多物种。在控制了共同祖先和整体体型的影响后，脑大小与相对吻长呈正相关。此外，我们发现雌性的大脑比雄性平均重4.3%，多雄物种表现出更明显的（11.7%）雌性偏倚的大脑大小二态性。研究结果表明，雌性对流动猎物的适应性和性选择是影响管鱼和海马脑大小进化的重要因素。最重要的是，我们的研究支持了这样一种观点，即性选择在大脑大小的进化中起着重要作用，无论哪种性别的性选择作用更大。
Brain size varies greatly at all taxonomic levels. Feeding ecology, life history and sexual selection have been proposed as key components in generating contemporary diversity in brain size across vertebrates. Analyses of brain size evolution have, however, been limited to lineages where males predominantly compete for mating and females choose mates. Here, we present the first original data set of brain sizes in pipefishes and seahorses (Syngnathidae) a group in which intense female mating competition occurs in many species. After controlling for the effect of shared ancestry and overall body size, brain size was positively correlated with relative snout length. Moreover, we found that females, on average, had 4.3% heavier brains than males and that polyandrous species demonstrated more pronounced (11.7%) female‐biased brain size dimorphism. Our results suggest that adaptations for feeding on mobile prey items and sexual selection in females are important factors in brain size evolution of pipefishes and seahorses. Most importantly, our study supports the idea that sexual selection plays a major role in brain size evolution, regardless of on which sex sexual selection acts stronger.