从属的华丽细尾鹩莺（蓝细尾鹩莺）会寄生在有吸引力的优势雄性的繁殖成功之上。
Subordinate superb fairy-wrens (Malurus cyaneus) parasitize the reproductive success of attractive dominant males.
作者信息
Double Michael C, Cockburn Andrew
机构信息
Evolutionary Ecology Group, School of Botany and Zoology, Australian National University, Canberra, ACT 0200, Australia.
出版信息
Proc Biol Sci. 2003 Feb 22;270(1513):379-84. doi: 10.1098/rspb.2002.2261.
Explanations of cooperative breeding have largely focused on the indirect benefits philopatric offspring gain from investing in kin. However, recent molecular studies have revealed that in many species subordinates provision unrelated offspring. This has led to the re-evaluation of the direct and indirect benefits of helping behaviour. In this study, we used microsatellite genotyping to assess the extra-group reproductive success of subordinate superb fairy-wrens (Malurus cyaneus), a species with extremely high rates of extra-group paternity. Extra-group subordinate males sired 10.2% (193 out of 1895) of all offspring sampled between 1993 and 2000 and 21.4% (193 out of 901) of all illegitimate offspring sired by known males. The extra-group success of subordinates was greatly influenced by the attractiveness of their dominant male. Subordinates of attractive dominants sired more extra-group young than did average dominants. Evidence suggests that mate choice in superb fairy-wrens is error-prone and subordinates can gain direct reproductive benefits through parasitizing the reproductive success of attractive dominants.
合作繁殖的解释主要集中在留巢后代通过投资亲属所获得的间接利益上。然而，最近的分子研究表明，在许多物种中，从属个体也会哺育非亲属后代。这导致了对帮助行为的直接和间接利益的重新评估。在本研究中，我们使用微卫星基因分型来评估从属超级细尾鹩莺（Malurus cyaneus）在群体外的繁殖成功率，该物种的群体外父权率极高。在1993年至2000年间采样的所有后代中，群体外从属雄性生育了10.2%（1895个中的193个），在已知雄性生育的所有非婚生后代中占21.4%（901个中的193个）。从属个体在群体外的成功很大程度上受到其占主导地位雄性的吸引力的影响。有吸引力的占主导地位雄性的从属个体比普通占主导地位雄性生育的群体外幼鸟更多。有证据表明，超级细尾鹩莺的配偶选择容易出错，从属个体可以通过寄生有吸引力的占主导地位雄性的繁殖成功来获得直接的繁殖利益。
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