Competitive Reduction by Satyrization? Evidence for Interspecific Mating in Nature and Asymmetric Reproductive Competition between Invasive Mosquito Vectors

Frederic Tripet Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Keele, United Kingdom; Florida Medical Entomology Laboratory, University of Florida, Vero Beach, Florida

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L. Philip Lounibos Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Keele, United Kingdom; Florida Medical Entomology Laboratory, University of Florida, Vero Beach, Florida

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Dannielle Robbins Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Keele, United Kingdom; Florida Medical Entomology Laboratory, University of Florida, Vero Beach, Florida

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Jenny Moran Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Keele, United Kingdom; Florida Medical Entomology Laboratory, University of Florida, Vero Beach, Florida

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Naoya Nishimura Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Keele, United Kingdom; Florida Medical Entomology Laboratory, University of Florida, Vero Beach, Florida

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Erik M. Blosser Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Keele, United Kingdom; Florida Medical Entomology Laboratory, University of Florida, Vero Beach, Florida

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Upon mating, male mosquitoes transfer accessory gland proteins (Acps) that induce refractoriness to further mating in females. This can also occur because of cross-insemination by males of related species, a process known as mating interference (satyrization). This mechanism could explain the competitive displacement of resident Aedes aegypti by the invasive Aedes albopictus where they co-occur. We tested this hypothesis in mosquito populations in Florida. A new polymerase chain reaction species diagnostic applied to sperm dissected from 304 field-collected females revealed bidirectional cross-mating in five (1.6%) individuals. Cross-injections of females with Acps showed that Ae. albopictus males induced monogamy in heterospecific females but not Ae. aegypti males. Despite its low frequency in the areas under study, the first evidence of cross-mating in nature and the asymmetric effect of Acps on mating suggest that satyrization may have initially contributed to the observed competitive reduction of Ae. aegypti by invasive Ae. albopictus in many areas.

Author Notes

*Address correspondence to Frederic Tripet, Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Staffordshire, ST5 5BG, UK. E-mail: f.tripet@biol.keele.ac.uk

Financial support: This research was supported by QR funding to FT from Keele University and a NIH grant 2R01 AI044973 to LPL.

Authors' addresses: Frederic Tripet, Dannielle Robbins, and Jenny Moran, Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Keele, Staffordshire, UK, E-mails: f.tripet@biol.keele.ac.uk, dannii_robbins@hotmail.com, and moranjenny@aol.com. L. Philip Lounibos, Naoya Nishimura, and Erik M. Blosser, Florida Medical Entomology Laboratory, University of Florida, Vero Beach, FL, E-mails: lounibos@ufl.edu, nishimur@ufl.edu, and eblosser@ufl.edu.

Reprint requests: Frederic Tripet, Center for Applied Entomology and Parasitology, School of Life Sciences, Keele University, Staffordshire, ST5 5BG, UK, E-mail: f.tripet@biol.keele.ac.uk.

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