Interspecific mating bias may drive Aedes albopictus displacement of Aedes aegypti during its range expansion.

is the most invasive mosquito in the world and often displaces in regions where their populations overlap. Interspecific mating has been proposed as a possible cause for this displacement, but whether this applies across the range of their sympatry remains unclear. and collected from allopatric and sympatric areas in China were allowed to interact in cage experiments with different crosses and sex-choices. The results confirm that asymmetric interspecific mating occurs in these populations with matings between allopatric males and females being significantly higher (55.2%) than those between males and females (27.0%), and sympatric mosquitoes showed a similar but lower frequency bias, 25.7% versus 6.2%, respectively. The cross-mated females can mate second time (remate) with the respective conspecific males and the 66.7% remating success of female was significantly higher than the 9.3% of females. Furthermore, 17.8% of the matings of males exposed to mixed pools of females and 9.3% of the matings of males with mixed and females were interspecific. The difference in the length of clasper between male (0.524 mm) and (0.409 mm) may be correlated with corresponding mates. We conclude that stronger male interspecific mating and more avid female intraspecific remating result in a satyr effect and contribute to competitive displacement of as allopatric invade during range expansion.