Indirect fitness consequences of mate choice in sticklebacks: offspring of brighter males grow slowly but resist parasitic infections
Indirect fitness consequences of mate choice in sticklebacks: offspring of brighter males grow slowly but resist parasitic infections
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DOI：
10.1098/rspb.2000.1331
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发表时间：
2001-01-07
影响因子：
4.7
通讯作者：
Huntingford, FA
中科院分区：
文献类型：
--
作者：
Barber, I;Arnott, SA;Huntingford, FA
性选择的“好基因”模型表明，精心制作的男性性装饰已经进化为男性质量的可靠信号，因为只有高遗传活力的男性才能够发展和保持它们。如果品质是可遗传的，那么雌性会从选择这样的个体中获益。一个关键的预测是，具有精心交配展示的雄性的后代将比那些不太精心的雄性表现得更好，但事实证明，很难证明这种效果独立于父母投资差异的影响。我们测试了与三棘鱼Gasterosteus aculeatus的雄性发育相关的“好基因”，使用体外受精产生了母亲的半同胞，这些同胞在没有父母照顾的情况下长大。由色彩鲜艳的男性所生的母亲同父异母兄弟姐妹的生长速度低于由沉闷的男性所生的同父异母兄弟姐妹，但对受控疾病的挑战更具抵抗力。在被感染的后代中，父亲更聪明的后代有更高的白色血细胞计数。这表明，高度活跃的雄性会将抗病能力传给后代。与生长减少的关联表明，抗病性和雄性性别颜色的遗传变异的维持机制。
'Good genes' models of sexual selection suggest that elaborate male sexual ornaments have evolved as reliable signals of male quality because only males of high genetic viability are able to develop and maintain them. Females benefit from choosing such individuals if quality is heritable. A key prediction is that the offspring of males with elaborate mating displays will perform better than those of less elaborate males, but it has proved difficult to demonstrate such an effect independently of the effects of differences in parental investment. We tested for 'good genes' linked to male ornamentation in the three-spined stickleback Gasterosteus aculeatus using in vitro fertilization to generate maternal half-siblings, which were raised without parental care.. Maternal half-siblings sired by brightly coloured males grew less quickly than half-siblings sired by dull males but were more resistant to a controlled disease challenge. Among the offspring that became infected, those with brighter fathers had higher white blood cell counts. This suggests that highly ornamented males confer disease resistance on their offspring. The association with reduced growth suggests a mechanism for the maintenance of heritable variation in both disease resistance and male sexual coloration.