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Trans generational effects of male age on son’s mating success, Acps and sperm traits in D. melanogaster

Studies on human and nonhuman organisms have shown that the quality of gametes decreases withincreasing of male age. Paradoxically, in many taxa, female prefer to mate with older males; however the adaptive significance of such preference is not clear until today due to lack of studies involving accessory gland proteins(Acps) and sperm traits. We used both cross sectional and longitudinal approaches to study male age effects on son’smating success, accessory gland proteins and sperm traits in D. melanogaster. It was noticed that in D.melanogaster, females of all age classes discriminated between sons of different male age classes and preferred to 
mate with sons of young males more frequently than with the sons of middle aged and old males. In pairwise 
mating, sons of young males showed a significantly greater courtship act compared to sons of middle aged and old 
males. In turn, females showed least rejection responses to the sons of young males than towards the sons of middle 
aged and old males. Further, sons of young males with smaller accessory glands, with a few larger main cells in theiraccessory glands, had produced greater quantities of Acps and were able to transfer significantly greater quantitiesof Acps and sperms to the mated females. As a result, females mated with them had greater fecundity and fertilitythan those mated with sons of middle aged or old males. Further, the sons of young males lived longer but femalesmated with sons of young males shorter life. Thus, our study suggests that with increasing of male age, the quality ofgametes increases, resulting in reduction of Acps, and sperm traits of sons. Thus females of D. melanogaster obtainindirect genetic benefits by mating with young males.[Abolhasan Rezaei, M. S. Krishna. Trans generational effects of male age on son’s mating success, Acps andsperm traits in D. melanogaster. N Y Sci J 2015;8(1):73-84]. (ISSN: 1554-0200).