Nattero Julieta, Dujardin Jean-Pierre, Del Pilar Fernández María, Gürtler Ricardo E
Laboratory of Eco-Epidemiology, Department of Ecology, Genetics and Evolution, Universidad de Buenos Aires-IEGEBA (CONICET-UBA), Intendente Güiraldes 2160, Ciudad Universitaria, Pabellón 2 C1428EGA, Ciudad Autónoma de Buenos Aires, Argentina.
MIVEGEC, UMR CNRS-IRD-UM1 5290, 911 Avenue Agropolis, BP 64501, FR-34394 Montpellier Cedex 5, France.
Infect Genet Evol. 2015 Dec;36:539-546. doi: 10.1016/j.meegid.2015.08.032. Epub 2015 Aug 28.
Fluctuating asymmetry (FA), a slight and random departure from bilateral symmetry that is normally distributed around a 0 mean, has been widely used to infer developmental instability. We investigated whether habitats (ecotopes) and host-feeding sources influenced wing FA of the hematophagous bug Triatoma infestans. Because bug populations occupying distinct habitats differed substantially and consistently in various aspects such as feeding rates, engorgement status and the proportion of gravid females, we predicted that bugs from more open peridomestic habitats (i.e., goat corrals) were more likely to exhibit higher FA than bugs from domiciles. We examined patterns of asymmetry and the amount of wing size and shape FA in 196 adult T. infestans collected across a gradient of habitat suitability and stability that decreased from domiciles, storerooms, kitchens, chicken coops, pig corrals, to goat corrals in a well-defined area of Figueroa, northwestern Argentina. The bugs had unmixed blood meals on human, chicken, pig and goat depending on the bug collection ecotope. We documented the occurrence of FA in wing shape for bugs fed on all host-feeding sources and in all ecotopes except for females from domiciles or fed on humans. FA indices for wing shape differed significantly among host-feeding sources, ecotopes and sexes. The patterns of wing asymmetry in females from domiciles and from goat corrals were significantly different; differences in male FA were congruent with evidence showing that they had higher mobility than females across habitats. The host-feeding sources and habitats of T. infestans affected wing developmental stability depending on sex.
波动不对称性（FA）是指与双侧对称性的轻微随机偏离，通常围绕0均值呈正态分布，已被广泛用于推断发育不稳定性。我们研究了栖息地（生态位）和宿主取食来源是否会影响吸血臭虫骚扰锥蝽的翅FA。由于占据不同栖息地的臭虫种群在取食率、饱血状态和妊娠雌虫比例等各个方面存在显著且一致的差异，我们预测来自更开阔的家周围栖息地（即山羊圈）的臭虫比来自住所的臭虫更有可能表现出更高的FA。我们检查了在阿根廷西北部菲格罗亚一个明确区域内，沿着从住所、储藏室、厨房、鸡舍、猪圈到山羊圈的栖息地适宜性和稳定性梯度收集的196只成年骚扰锥蝽的不对称模式以及翅大小和形状的FA量。这些臭虫根据采集生态位的不同，分别以人、鸡、猪和山羊的血液为食且未混合。我们记录了以所有宿主取食来源为食的臭虫以及除住所雌虫或以人为食的雌虫外，在所有生态位中翅形状FA的发生情况。翅形状的FA指数在宿主取食来源、生态位和性别之间存在显著差异。来自住所和山羊圈的雌虫的翅不对称模式显著不同；雄性FA的差异与表明它们在不同栖息地中比雌性具有更高移动性的证据一致。骚扰锥蝽的宿主取食来源和栖息地根据性别影响翅的发育稳定性。
