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Jonathan P. Balcombe 《Evolutionary ecology》1989,3(1):77-79
Summary The data of Woolfenden and Fitzpatrick (1984) show a statistically significant asymmetry in the sex ratio of non-breeders when one of the breeders is not the non-breeder's parent. I propose that the asymmetry is attributable to a combination of two factors acting on non-breeders: the value of inheriting a territory, and incest avoidance. Although natal territories are only occasionally inherited by non-breeders, and then apparently only by males, therate of inheritance is significantly higher for parent/step-parent breeders (n=6) than when both breeders are the non-breeder's parents (n=1). An alternative hypothesis, that stepparents determine the non-breeder asymmetry by ousting potential rivals, might also explain the data, but evidence is currently lacking. 相似文献
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