Interlocus Sexual Conflict and the evolution of Life-histories
N. G. Prasad, Indian Institute of Science Education & Research (IISER), Mohali
Interlocus conflict predicts (a) Evolution of traits, beneficial to males but detrimental to females and (b) evolution of aging and life-span under the influence of the cost of bearing these traits. We test these predictions using experimental evolution on replicate populations of Drosophila melanogaster. Within 50 generations of adaptation to altered operational sex ratios, males from the male biased (high conflict) regime evolved higher activity and courtship frequency along with greater mate-harming ability in terms of increased mortality of females mated to them. Males from the female biased regime did not evolve altered reproductive behaviour, however, they were found to be less harming to their mates. We also found that consistent with the theoretical predictions, males from male biased regime lived shorter compared to males from the female biased regime. Thus we provide evidence for the evolution of life-history under altered levels of sexual conflict.
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