To verify this, the researchers bred incest beetles and observed how the average lifespan of normal animals changed. The surprising result: The lifespan of the males was not only shortened by inbreeding less than that of the females, it even extended. That can not be justified by the different chromosomes, explain the researchers.
As an alternative explanatory approach, the researchers call the so-called gender-specific selection: For males completely different breeding strategies may be advantageous than for females. For example, it could be useful for males to invest a lot of energy in mating at an early age and to accept a relatively early death. Females, on the other hand, need time to lay eggs and have to live longer to mate several times. Inbreeding leads to disorders of these strategies. Thus, the prolonged life of the seed beetle male may be an evolutionary disadvantage. In fact, the males, as well as the females, produced fewer offspring? her reproductive fitness decreased as a result of inbreeding.Trine Bilde (University of Uppsala) et al .: BMC Evolutionary Biology (Vol. 9, p.33). ddp / science.de? Martin Rötzschke advertisement