Indirect fitness benefits are not related to male dominance in a killifish
Indirect fitness benefits are not related to male dominance in a killifish
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DOI：
10.1007/s00265-009-0798-2
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发表时间：
2009-08-01
影响因子：
2.3
通讯作者：
Reichard, Martin
中科院分区：
文献类型：
--
作者：
Polacik, Matej;Reichard, Martin
最近的理论和实证研究表明，雄性优势往往与雌性择偶偏好不一致，配偶选择的间接（遗传）利益可能与雄性优势无关。我们测试了雌性偏好是否与雄性优势相对应，以及与优势雄性交配是否有利于后代的健康，这是一种小型淡水鱼，非洲一年生鳉鱼，一种没有亲代照顾的物种。实验设计控制了男性年龄的影响、精子和卵子消耗的可能性，并考虑了女性在排卵期间通过操纵卵子数量来表达其偏好的可能性。通过与已知优势雄虫的顺序交配，我们发现雌性北蛾在卵数和体型上都不存在择偶偏好，也不存在对特定雄虫的一致择偶偏好。然而，雄性后代的孵化成功率始终较高，而且这种效应在雌性个体之间是可重复的。因此，一些雄性为雌性提供了与遗传质量（“好基因”）相关的间接利益，并通过增加孵化率来表达，但这种利益与雄性的优势地位或体型无关。
Recent theoretical and empirical studies have shown that male dominance is often at odds with female mate preference and that indirect (genetic) benefits of mate choice may not be related to male dominance. We tested whether female preference corresponded to male dominance and whether mating with dominant males conveyed benefits to offspring fitness in a small freshwater fish, the African annual killifish Nothobranchius korthausae (Cyprinodontiformes), a species without parental care. The experimental design used controlled for the effect of male age, possibility of sperm and egg depletion, and accounted for a potential that females express their preference through maternal effects by manipulation of egg mass during ovulation. By sequentially mating females with males of known dominance, we found that female N. korthausae showed no mate preference in terms of egg numbers deposited with respect to male dominance or body size and no congruent mate preference to specific males was detected. However, males sired offspring with consistently higher hatching success and the effect was repeatable across individual females. Thus, some males provided females with indirect benefits related to additive genetic quality ("good genes") and expressed via increased hatching rate, but this benefit was not related to male dominance status or body size.