Increased lifetime reproductive success for Siberian jay (Perisoreus infaustus) males with delayed dispersal

Jan Ekman , Anders Bylin , HÔkan TegelstrÎm

Abstract

In a crowded environment the natal territory could serve as a haven for young and inexperienced offspring until a breeding vacancy emerges. Delayed dispersal and association with kin could then offer adaptive benefits through an individual fitness gain. Here we report that delayed dispersal is associated with a higher lifetime individual fitness in Siberian jay (Perisoreus infaustus) males. Sons bred more successfully and had more reproductive events in life when they delayed dispersal. The higher lifetime reproductive success when sons disperse later in life is sufficient to promote postponement of natal dispersal, suggesting that dispersal is delayed due to ecological constraints on access to high–quality habitats. We argue that the maintenance of this variation in the timing of dispersal and reproductive success can be reconciled with non–genetic mechanisms driving dispersal. Social dominance within broods reflecting environmental conditions during growth is such a mechanism.

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