Schachter-Broide Judith, Gürtler Ricardo E, Kitron Uriel, Dujardin Jean-Pierre
Laboratorio de Eco-Epidemiologìa, Dpto. de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina.
J Med Entomol. 2009 Sep;46(5):994-1000. doi: 10.1603/033.046.0504.
Wing geometric morphometry of Triatoma infestans (Klug) (Hemiptera: Reduviidae) populations in northwestern Argentina showed that individual collection sites represent the discrete unit where metric differentiation took place. Here we studied temporal variations in wing size and shape of T. infestans populations from defined capture sites on three occasions between 2000 and 2003. Bugs collected from domiciles and/or storerooms had significantly larger right-wing centroid size than bugs collected at goat and/or pig corrals by the end of summer 2000 for both sexes. Conversely, male bugs collected from domiciles and/or storerooms had significantly smaller centroid size than bugs collected from pig corrals in spring 2002. The inversion in wing centroid size between seasons was consistent between sexes. Wing shape analysis from the south-central extreme of the study village showed divergence between collection dates for both sexes. Wing shape divergence was highly significant between male bugs collected by the end of summer 2000 and those collected in spring 2002 and by the end of summer 2003. For females, wing shape divergence was marginally significant between the end of summer 2000 and spring 2002, and significant between spring 2002 and the end of summer 2003. Unlike season-related variations in wing centroid size, shape differentiation was related to the time period elapsed between sample collections and suggested genetic influences acting on shape. Simultaneous consideration of wing size and shape provided complementary information on the direction and timing of bug dispersal. Morphological studies may allow determining the degree of relatedness of different bug populations and to associate morphological heterogeneity with temporal patterns of reinfestation.
阿根廷西北部克氏锥蝽（半翅目：猎蝽科）种群的翅几何形态测量表明，各个采集地点代表了发生度量分化的离散单元。在此，我们研究了2000年至2003年间三次从特定捕获地点采集的克氏锥蝽种群翅大小和形状的时间变化。到2000年夏末，从住所和/或储藏室采集的虫子，无论雌雄，其右翼质心大小均显著大于从山羊和/或猪圈采集的虫子。相反，2002年春季，从住所和/或储藏室采集的雄虫质心大小显著小于从猪圈采集的虫子。不同季节间翅质心大小的这种反转在两性中是一致的。对研究村庄中南部极端区域的翅形分析表明，两性的采集日期之间存在差异。2000年夏末采集的雄虫与2002年春季及2003年夏末采集的雄虫之间翅形差异非常显著。对于雌虫，2000年夏末与2002年春季之间翅形差异不显著，而2002年春季与2003年夏末之间翅形差异显著。与翅质心大小的季节相关变化不同，形状分化与样本采集之间经过的时间段有关，表明存在影响形状的遗传因素。同时考虑翅大小和形状，为虫子扩散的方向和时间提供了补充信息。形态学研究可能有助于确定不同虫子种群的相关程度，并将形态异质性与再次侵扰的时间模式联系起来。
