Social fishes and single mothers: brain evolution in African cichlids
Social fishes and single mothers: brain evolution in African cichlids
复制标题
DOI：
10.1098/rspb.2008.0979
复制
发表时间：
2009-01-07
影响因子：
4.7
通讯作者：
Kolm, Niclas
中科院分区：
文献类型：
--
作者：
Gonzalez-Voyer, Alejandro;Winberg, Svante;Kolm, Niclas
与任何器官一样，在对异速生长进行充分控制后，大脑大小的差异被认为是对选择的反应。Tanganyikan慈鲷拥有超过200个物种和惊人的生态位偏好和社会组织多样性，为研究大脑进化提供了绝佳的机会。我们使用系统发育比较分析的性别成年人从39 Tanganyikan慈鲷物种在多元回归框架调查生态，性选择和父母的照顾模式对全脑大小的影响，以及分析性别特异性的影响。首先，使用物种特异性的措施，我们分析了饮食，栖息地，形式的照顾（mouthbrooding或基板守卫），照顾类型（双亲或女性）和强度的性选择对大脑大小的影响，同时控制身体大小。然后，我们分别对男性和女性的大脑大小进行了重复分析。饮食类型和护理类型与全脑大小显著相关。性别特异性分析表明，女性大脑的大小与护理类型显着相关，而男性大脑的大小与护理类型不相关。我们的研究结果表明，更复杂的社会互动与饮食选择更大的大脑，进一步说，单亲照顾的负担施加高认知要求的女性。
As with any organ, differences in brain size-after adequate control of allometry-are assumed to be a response to selection. With over 200 species and an astonishing diversity in niche preferences and social organization, Tanganyikan cichlids present an excellent opportunity to study brain evolution. We used phylogenetic comparative analyses of sexed adults from 39 Tanganyikan cichlid species in a multiple regression framework to investigate the influence of ecology, sexual selection and parental care patterns on whole brain size, as well as to analyse sex-specific effects. First, using species-specific measures, we analysed the influence of diet, habitat, form of care (mouthbrooding or substrate guarding), care type (biparental or female only) and intensity of sexual selection on brain size, while controlling for body size. Then, we repeated the analyses for male and female brain size separately. Type of diet and care type were significantly correlated with whole brain size. Sex-specific analyses showed that female brain size correlated significantly with care type while male brain size was uncorrelated with care type. Our results suggest that more complex social interactions associated with diet select for larger brains and further that the burden of uniparental care exerts high cognitive demands on females.