The Effect of Inbreeding on Mating Behaviour of West Indian Sweet Potato Weevil Euscepes postfasciatus
2011
Kuriwada, Takashi | Kumano, Norikuni | Shiromoto, Keiko | Haraguchi, Dai
When there is an inbreeding depression, mating with a kin individual is generally considered maladaptive behaviour. However, in some conditions, the inclusive fitness benefits from inbreeding may outweigh the costs of inbreeding depression, and thus, inbreeding tolerance is often adaptive. Inbreeding depression and the effect of relatedness on mating behaviour in the West Indian sweet potato weevil Euscepes postfasciatus were examined. No significant inbreeding depression was detected as indicated by body weight and number of progeny emerging from sweet potato roots. Male mating performance (i.e. number of mating occurrences per night) was adversely affected by inbreeding depression, but the effect was low (fitness loss was 6.3%). Although there were no significant differences in latency to mounting, preâcopulatory guarding, copulation and postâcopulatory guarding duration between fullâsib and nonâkin pairs, the copulation rate of fullâsib pairs was significantly higher than that of nonâkin pairs. These results support the theoretical prediction that when inbreeding depression is weak, copulation with close relative individuals is favoured.
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