Clinal variation in post-winter male fertility retention; an adaptive overwintering strategy in Drosophila melanogaster
L Rako, NA Poulsen, J Shirriffs, AA Hoffmann
Journal of Evolutionary Biology | WILEY | Published : 2009
In insects including Drosophila melanogaster, females can overwinter at the adult stage by adopting a shallow reproductive diapause, but almost nothing is known about male reproductive diapause. In this study, we test for the maintenance of fertility in overwintering males from the eastern Australian D. melanogaster cline. Males from southern temperate populations maintained in field cages in temperate Melbourne had a higher fertility in spring compared with males from tropical locations. Temperate males successfully inseminated more females, and there were also more offspring produced per inseminated female. The resulting linear post-winter fertility clines were unrelated to male body size...View full abstract
This work was supported by the Australian Research Council via a Discovery grant. The authors thank two anonymous reviewers for comments.