Asymmetric introgression between sympatric molestus and pipiens forms of Culex pipiens (Diptera: Culicidae) in the Comporta region, Portugal |
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Authors: | Bruno Gomes Carla A Sousa Maria T Novo Ferdinando B Freitas Ricardo Alves Ana R Côrte-Real Patrícia Salgueiro Martin J Donnelly António PG Almeida João Pinto |
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Institution: | 1. Centro de Malária e outras Doen?as Tropicais, Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, Rua da Junqueira 96, 1349-008, Lisboa, Portugal 2. Unidade de Entomologia Médica/Unidade de Parasitologia e Microbiologia Médicas, Instituto de Higiene e Medicina Tropical, Universidade Nova de Lisboa, Rua da Junqueira 96, 1349-008, Lisboa, Portugal 3. Vector Group, Liverpool School of Tropical Medicine, Pembroke Place, L3 5QA, Liverpool, UK
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Abstract: | Background
Culex pipiens L. is the most widespread mosquito vector in temperate regions. This species consists of two forms, denoted molestus and
pipiens, that exhibit important behavioural and physiological differences. The evolutionary relationships and taxonomic status
of these forms remain unclear. In northern European latitudes molestus and pipiens populations occupy different habitats (underground
vs. aboveground), a separation that most likely promotes genetic isolation between forms. However, the same does not hold in
southern Europe where both forms occur aboveground in sympatry. In these southern habitats, the extent of hybridisation and
its impact on the extent of genetic divergence between forms under sympatric conditions has not been clarified. For this purpose,
we have used phenotypic and genetic data to characterise Cx. pipiens collected aboveground in Portugal. Our aims were to determine levels of genetic differentiation and the degree of hybridisation
between forms occurring in sympatry, and to relate these with both evolutionary and epidemiological tenets of this biological
group. |
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