The Institut de Zoologie et d'Ecologie Animale, Université de Lausanne, Bâtiment de Biologie, 1015 Lausanne, Switzerland; Zoologisches Institut, Bern Universität, Ethologische Station Hasli, Wohlenstrasse 50a, 3032 Hinterkappelen, Switzerland.
Trends Ecol Evol. 1997 Mar;12(3):99-103. doi: 10.1016/s0169-5347(96)10065-3.
Many animals can identify their relatives and bias altruistic behaviour in their favour. However, recent studies have also uncovered cases where nepotism might be expected but is weak or absent within social groups. For instance, in some bird and mammal species, males apparently feed offsping that have been sired by other males at the same rate as their own offspring. Similarly, social insect workers fail to favour more closely related individuals within their colony. Why is this so?
许多动物能够识别自己的亲属，并偏向于对自己亲属表现出利他行为。然而，最近的研究也发现了一些群体中原本应该存在亲属关系偏向但却很弱或不存在的情况。例如，在一些鸟类和哺乳动物中，雄性显然以相同的速度喂养由其他雄性生育的后代，而不是自己的后代。同样，群居昆虫的工蜂也不会偏爱与其亲缘关系更近的个体。这是为什么呢？
