Studies on remating behaviour in the Drosophila bipectinata species complex: evidence for sperm displacement.

In Drosophila bipectinata female remating with respect to productivity and sperm displacement was studied by employing two mutant strains and a wild-type strain. The comparison of productivity between once-mated (control) and remated females revealed that the productivity of remated females is significantly higher than that of once-mated females in all the crosses showing increased productivity after remating. The P2' values (proportion of second male progeny produced after remating) were calculated to test sperm displacement in each cross of remated females, which range from 0.60 to 0.67 extending the evidence for sperm displacement in D. bipectinata. [ABSTRACT FROM AUTHOR]