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satyrization and satyrization-resistance in competitive displacements of invasive mosquito species

Insect Science 2016年第2期23卷 162-174页

作者： Irka Ewa Bargielowski Leon Philip Lounibos Florida Medical Entomology Laboratory University of Florida Vero Beach Florida USA

Competitive displacements or reductions of resident populations of insects, often effected by a related species, may be caused by a variety of mechanisms. satyrization is a form of mating interference in which males of one species mate with females of another species, significantly decreasing their fitness and not generating hybrids. Satyriza- tion has been established to be the probable cause of competitive displacements of resident mosquitoes by invasive species, especially of Aedes aegypti by Aedes albopictus, two important vectors of dengue and chikungunya viruses. Mathematical models predict that even low levels of asymmetric mating interference are capable of producing competitive displacements or reductions. Couplings of virgin Ae. aegypti females with Ae. albopictus males effectively sterilize these females through the monogamizing actions of male ac- cessory gland products, but the converse interspecific mating does not impact the future reproduction ofAe. albopictus females. Populations ofAe. aegypti exposed to satyrization quickly evolve resistance to interspecific mating, which is believed to ameliorate repro- ductive interference from, and promote co-existence with, Ae. albopictus. The evolution of satyrization resistance among Ae. aegypti in laboratory cages is accompanied by fitness costs, such as reduced fecundity and slower receptivity to conspecific males. Cage exper- iments and field observations indicate that Ae. albopictus males are capable of satyrizing females of other species of the Stegomvia subgenus, potentially leading to competitive displacements, and possible extinctions, especially of endemic species on islands. Exam- ination of other examples of reproductive interference in insects reveals few parallels to the mechanism and outcomes of satyrization by Ae. albopictus. We conclude by posing the hypothesis that satyrization may favor the ecological success of Ae. albopictus, and suggest many lines for future research on this phenomenon.

关键词： Aedes aegypti Aedes albopictus mating interference reproductive interfer-ence satyrization

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