Ewen JG, Armstrong DP
Ecology Group, Institute of Natural Resources, Massey University
Anim Behav. 2000 Oct;60(4):429-433. doi: 10.1006/anbe.2000.1485.
In species with biparental care of offspring and high levels of extrapair parentage, paired males may suffer reduced fitness by investing in offspring that are not their own. In such instances, males are predicted to evolve some form of discrimination between kin and nonkin and vary investment accordingly. One simple form of discrimination is to follow behavioural cues to paternity. We investigated paternal contribution to chick rearing in a socially monogamous population of stitchbirds, Notiomystis cincta, with high levels of extrapair copulation (EPC) and extrapair paternity. The relative contribution of the male to chick provisioning was negatively correlated with attempted EPC frequency. Because the majority of EPC attempts are forced and conspicuous in stitchbirds they are an obvious cue for males to use. Copyright 2000 The Association for the Study of Animal Behaviour.
在具有双亲照料后代且存在高水平婚外亲子关系的物种中，配对的雄性可能会因投资于非自己的后代而降低自身的适合度。在这种情况下，预计雄性会进化出某种区分亲属和非亲属的形式，并相应地改变投资。一种简单的区分形式是根据行为线索来确定亲子关系。我们调查了在一个社会一夫一妻制的缝叶吸蜜鸟种群中，雄性对雏鸟养育的贡献，该种群存在高水平的婚外交配（EPC）和婚外亲子关系。雄性对雏鸟供应的相对贡献与尝试的EPC频率呈负相关。由于在缝叶吸蜜鸟中，大多数EPC尝试是被迫的且很明显，所以它们是雄性可以利用的明显线索。版权所有2000年动物行为研究协会。
