Apr 24, 2020

Evolutions of reproductive traits have no life-history associated cost in Drosophila melanogaster selected for cold resistance

BioRxiv : the Preprint Server for Biology
Karan Singh, N. G. Prasad


In insect species like Drosophila melanogaster, ability to evolve greater resistance or evolution of certain traits under specific environmental condition leads to energy trade-offs with other important life-history traits. A number of studies from multiple fields have documented the life-history associated cost. However, very few laboratory selection studies on increased resistance to cold stress have assessed the life-history associated cost. For this study, we used replicate populations of D. melanogaster that have been selected for increased resistance to non lethal cold-shock and their control populations. We have previously reported that the selected populations have evolved faster reproductive recovery and higher egg-viability post cold shock. In this study we investigated the potential life-history costs of these evolved traits. To assess life-history cost, we measured longevity and life time fecundity with and without cold-shock. Development time and dry body weight were measured from the progeny of parents that were given cold-shock or no-shock treatments. We found that there were no significant differences in longevity, life time fecundity, and male body weight between the selected and control populations. However, f...Continue Reading

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