Metric variation among geographic populations of the chagas vector Triatoma dimidiata (Hemiptera: Reduviidae: Triatominae) and related species
Metric variation among geographic populations of the chagas vector Triatoma dimidiata (Hemiptera: Reduviidae: Triatominae) and related species
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DOI：
10.1603/0022-2585-41.3.296
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发表时间：
2004-05-01
影响因子：
2.1
通讯作者：
Dujardin, JP
中科院分区：
文献类型：
--
作者：
Bustamante, DM;Monroy, C;Dujardin, JP
采用传统的头部性状形态测定法，对不同地理区域的8个三角杉居群及其近缘种进行了比较。种内比较采用去除异速变化的方法，种间比较采用等距尺度变化的方法。种内比较显示，不同种群间头形差异显著，与地理位置相关，显示出北部、中部和南部种群的分离（在雌性中更为明显），并支持该物种包括几个进化上不同的种群的观点。来自危地马拉的一个森林种群的定位与地理无关，因为它与哥伦比亚的一个独特种群关系更密切。这个森林种群是在洞穴中发现的，而哥伦比亚的标本虽然是在房子里收集的，但可能是从附近的洞穴迁徙而来的。进化和/或生态影响可能导致这两个群体的头部形状相似：两个群体的共同祖先起源或由相似的环境压力引起的形态趋同。种间比较包括同一属的其他4个区域种，其中3个属于叶虫复合体（T pallidipennis， T mexicana和T ryckmani，后者暂时），第4个属于长尾复合体（T nitida）。即使在调整大小后，这两个复合体的头部尺寸也很容易分开，我们的数据支持将T dimidiata包含在层状瘤复合体中。
Eight Triatoma dimidiata populations from different geographic regions were compared along with related species using traditional morphometry of head characters. A method for removing allometric change was used for the intraspecific comparisons, and scaling for the isometric change of size was used for the interspecific comparisons. The intraspecific comparison showed significant head shape differences between T. dimidiata populations correlating with geography, showing a separation between the northern, intermediate, and southern collections (more evident in females), and supporting the idea that this species includes several evolutionarily divergent populations. The positioning of one sylvatic group from Guatemala did not correlate with geography, because it was more closely related to a distinct population of Colombia. This sylvatic group was found in caves, while the Colombian specimens, although collected in houses, may have migrated from nearby caves. Evolutionary and/or ecological influences could be responsible for the head shape similarities between these two groups: a common ancestral origin of both populations or a morphological convergence caused by similar environmental pressures. The interspecific comparisons included four other regional species of the same genus, three of them belonging to the phyllosoma complex (T pallidipennis, T mexicana, and T ryckmani, the latter provisionally) and the fourth one classified in the protracta complex (T nitida). Both complexes were readily separated by their head dimensions, even after size adjustment, and our data support inclusion of T dimidiata within the phyllosoma complex.