Good genes sexual selection in nature
Good genes sexual selection in nature
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DOI：
10.1073/pnas.0608184103
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发表时间：
2006-10-31
影响因子：
11.1
通讯作者：
Waits, Lisette
中科院分区：
文献类型：
--
作者：
Byers, John A.;Waits, Lisette
自然界中雌性对配偶的抽样和选择是否会影响后代的表现，这在理论上是一个有争议的问题，在实证上也是一个开放的问题。美洲叉角羚（Antilocapra americana）雌性叉角羚参与了一个明显且能量昂贵的配偶取样过程，以识别精力充沛的雄性。尽管雌性个体是独立取样的，但它们的选择都集中在一小部分能生育最多后代的雄性身上。有吸引力的雄性的后代更有可能存活到断奶和5岁，这导致了随机交配的选择差异（根据断奶后代一生中预期的差异计算）为0.32。提高断奶存活率似乎是通过更快的生长速度来实现的。雌性通过提高产奶率来补偿与不那么有吸引力的配偶交配。由于叉角羚雄性没有昂贵的装饰物，我们得出结论，雌性在没有装饰物的情况下也可以选择良好的基因。此外，女性的选择可能是一种重要的、未被认识到的力量，可以降低种群的遗传负荷。
Whether the mate sampling and choice performed by females in nature influences offspring performance is a controversial issue in theory and an open empirical question. Pronghorn (Antilocapra americana) females engage in an obvious and energetically expensive mate sampling process to identify vigorous males. Although individual females sample independently, their choices converge on a small proportion of males that sire most young. offspring of attractive males were more likely to survive to weaning and to age classes as late as 5 years, resulting in a selection differential, calculated by expected differences in lifetime number of offspring weaned, of 0.32 against random mating. Enhanced survival to weaning appeared to be accomplished by faster growth rates. Females compensated for matings with a less attractive mate by elevating rates of milk delivery to their young. Because pronghorn males do not have costly ornaments, we conclude that female choice for good genes can exist in the absence of ornaments. Furthermore, female choice may be important and unrecognized as a force that can lower population genetic load.