Garzón Maximiliano J, Schweigmann Nicolás
Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ecología, Genética y Evolución, Grupo de estudio de Mosquitos, Buenos Aires, Argentina.
Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina.
J Med Entomol. 2018 Oct 25;55(6):1602-1606. doi: 10.1093/jme/tjy096.
Shape variability among individuals is important to understand some ecological relationships, since it provides the nexus between the genotype and the environment. Geometric morphometrics based on generalized procrustes analysis was applied on 17 landmarks of the wings of Aedes albifasciatus (Macquart 1838) (Diptera: Culicidae) females collected from three ecoregions of Argentina (Delta and islands of the Paraná River, Pampa, and Patagonian steppe). This methodology was used to discriminate the shapes of individuals belonging to different regions. The population of the Patagonian steppe, which was the most geographically distant, showed the most dissimilar shape. Different local variations in wing shape could have been selected according to the environmental characteristics and maintained by geographic isolation. The individuals of the two ecoregions closest to each other (Delta and islands of the Paraná River and Pampa) showed differences in shape that can be explained by a lower gene flow due to the effect of geographic isolation (by the Paraná River) and the limited dispersive capacity of Ae. albifasciatus. The results allow concluding that both environmental diversity and geographic barriers could contribute to local variations in wing shape.
个体间的形状变异性对于理解一些生态关系很重要，因为它提供了基因型与环境之间的联系。基于广义普氏分析的几何形态测量学应用于从阿根廷三个生态区域（巴拉那河三角洲和岛屿、潘帕斯草原和巴塔哥尼亚草原）采集的白纹伊蚊（Macquart 1838）（双翅目：蚊科）雌性翅膀的17个地标点。该方法用于区分不同区域个体的形状。地理位置最偏远的巴塔哥尼亚草原种群显示出最不同的形状。根据环境特征可能选择了翅膀形状的不同局部变异，并通过地理隔离得以维持。彼此最接近的两个生态区域（巴拉那河三角洲和岛屿以及潘帕斯草原）的个体在形状上存在差异，这可以通过地理隔离（巴拉那河）的影响以及白纹伊蚊有限的扩散能力导致的较低基因流来解释。结果表明，环境多样性和地理障碍都可能导致翅膀形状的局部变异。
