Intra-specific variation of sperm length in the malaria vector Anopheles gambiae: males with shorter sperm have higher reproductive successReportar como inadecuado




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Malaria Journal

, 7:214

First Online: 21 October 2008Received: 15 July 2008Accepted: 21 October 2008

Abstract

BackgroundIntra-specific variation in sperm length influences male reproductive success in several species of insects. In males of the malaria vector Anopheles gambiae, sperm length is highly variable but the significance of this variation is unknown. Understanding what determines the reproductive success of male mosquitoes is critical for controlling malaria, and in particular for replacing natural populations with transgenic, malaria-resistant mosquitoes.

MethodsA laboratory population of A. gambiae males was tested for intra-specific variation in sperm length. A full-sib quantitative genetic design was used to test for a genetic component of sperm length in A. gambiae males and estimate its heritability. This study also tested for a relationship between sperm length and male reproductive success in A. gambiae. Male reproductive success was measured as the proportions of inseminated and ovipositing females.

ResultsThere was intra-specific variation of sperm length in A. gambiae. There was no significant genetic variation in sperm length and its heritability was low h = 0.18 compared to other insects. Sperm length was correlated with male body size measured as wing length. Males with short sperm had significantly higher reproductive success than males with long sperm and this was independent of body size.

ConclusionThis is the first study to demonstrate intra-specific variation in sperm length in A. gambiae and that males with short sperm have higher reproductive success. That sperm length influences female oviposition is important for any strategy considering the release of transgenic males.

Electronic supplementary materialThe online version of this article doi:10.1186-1475-2875-7-214 contains supplementary material, which is available to authorized users.

Jacob C Koella and Hilary Hurd contributed equally to this work.

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Autor: Maarten J Voordouw - Jacob C Koella - Hilary Hurd

Fuente: https://link.springer.com/



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