Chromosomal and environmental determinants of morphometric variation in natural populations of the malaria vector Anopheles funestus in Cameroon
Chromosomal and environmental determinants of morphometric variation in natural populations of the malaria vector Anopheles funestus in Cameroon
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DOI：
10.1016/j.meegid.2011.03.003
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发表时间：
2011-07-01
影响因子：
3.2
通讯作者：
Fontenille, Didier
中科院分区：
文献类型：
--
作者：
Ayala, Diego;Caro-Riano, Harling;Fontenille, Didier
funestus按蚊是世界上最熟练的疟疾媒介之一，主要是因为它具有在非洲各地广泛生态环境中繁殖的非凡能力。其强大的环境可塑性主要与大量的遗传多态性和倒置多态性有关。然而，人们对这种生态适应所带来的形态变化知之甚少。在这里，我们报告了在喀麦隆（中非）广泛的生态地理条件下收集的该物种核型标本的翅膀形态变化。我们的研究结果表明，蚊子翅膀性状具有很强的选择性。机翼尺寸的变化与温度和海拔高度有关（p < 0.001），而机翼形状不表现出特定的环境模式。另一方面，我们观察到翅膀形状变异与核型有显著相关性（p < 0.001），而翅膀大小变异与核型没有显著相关性（p < 0.05）。这种模式在不同的环境条件下都保持不变。综上所述，我们的研究结果有力地证明了形态特征的变化是自然选择的结果，并有助于沙蚤种群的局部适应。此外，染色体多态性与翅膀形状之间的强大关系为染色体倒位对疟疾病媒表型变异的影响提供了新的进化假设。(C) 2011 Elsevier B.V.版权所有
Anopheles funestus is one of the most proficient malaria vectors in the world, mainly because of its remarkable ability to populate a wide range of ecological settings across Africa. Its formidable environmental plasticity has been primarily associated to high amounts of genetic and inversion polymorphisms. However, very little is known about the morphological changes that this ecological adaptation entails. Here, we report on wing morphometric variations in karyotyped specimens of this species collected throughout a wide range of eco-geographical conditions in Cameroon (Central Africa). Our results revealed strong selection on mosquito wing traits. Variation of wing size was dependent on temperature and elevation (p < 0.001), while wing shape did not exhibit a specific environmental pattern. On the other hand, we observed a significant correlation of wing shape variation (p < 0.001), but not size (p > 0.05), with regard to karyotype. This pattern was maintained across different environmental conditions. In conclusion, our findings cast strong evidence that change in morphometric traits are under natural selection and contribute to local adaptation in A. funestus populations. Furthermore, the robust relation between chromosome polymorphisms and wing shape suggests new evolutionary hypotheses about the effect of chromosomal inversions on phenotypic variation in this malaria vector. (C) 2011 Elsevier B.V. All rights reserved.