PARENTAL INVESTMENT IN MALE AND FEMALE OFFSPRING IN POLYGYNOUS MAMMALS
PARENTAL INVESTMENT IN MALE AND FEMALE OFFSPRING IN POLYGYNOUS MAMMALS
复制标题
DOI：
10.1038/289487a0
复制
发表时间：
1981-01-01
期刊：
影响因子：
64.8
通讯作者：
GUINNESS, FE
中科院分区：
文献类型：
--
作者：
CLUTTONBROCK, TH;ALBON, SD;GUINNESS, FE
两种进化理论预测了哺乳动物的父母将如何分配资源给他们的雄性和雌性后代。如果雄性的繁殖成功率差异比雌性大，而成人的繁殖成功率差异又受到亲代投资的影响，那么父母将把更多的资源分配给儿子而不是女儿，从而最大限度地提高其繁殖成功率。因为生育一种性别的后代的收益与分配给他们的总投资成反比，父母应该平均地将总投资平均分配给他们的雄性和雌性后代，无论哪一种性别的个体生产成本更高，都要少养育。对马鹿（Cervus elaphus）和其他一夫多妻哺乳动物的亲代投资在多大程度上符合这些预测进行了检验。在一些哺乳动物中，母亲对儿子的投入比对女儿的投入更多，但与预测相反，没有迹象表明这些物种中养育的雄性后代更少。
Two evolutionary theories predict how mammalian parents would be expected to allocate the resources at their disposal to their male and female progeny. Where reproductive success varies more widely among males than females and variation in success among adults is influenced by parental investment, parents would maximize their reproductive success by allocating a greater proportion of their resources to individual sons than to individual daughters. Because the benefits of producing offspring of one sex are inversely related to the total investment allocated to them, parents should, on average, divide their total investment equally between their male and female progeny, rearing fewer of whichever sex is individually more expensive to produce. The extent to which parental investment in red deer (Cervus elaphus) and other polygynous mammals matches these predictions is examined. In several mammals, mothers invest more heavily in individual sons than daughters, but contrary to prediction, there is no indication that fewer male offspring are reared in these species.