白斑三角瘤单倍群划分的几何形态计量学和生态位模型(半翅目:白斑三角瘤科

IF 1.7 Q3 PARASITOLOGY
Daryl D. Cruz , Sandra Milena Ospina-Garcés , Elizabeth Arellano , Carlos N. Ibarra-Cerdeña , Elizabeth Nava-García , Raúl Alcalá
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引用次数: 0

摘要

最近,基于分子标记对墨西哥重要的恰加斯病媒介苍白锥虫进行的系统发育分析显示,有五个单系单倍群是有效的隐种。在这里,我们使用头部和前足目特征、栖息地的环境特征和生态位建模来比较苍白锥虫单倍群。为了分析形状的变化,使用基于界标和半界标的方法获得并分析了标本的头部和前足的图像。生态位模型是从发生数据以及一组生物气候变量中获得的,这些变量表征了每个分析单倍群的环境生态位。头部变形网格显示有轻微的位移,朝向眼前标志的后部区域。头部形态变化最大的是向触角结节前部强烈移位。Procrustes方差分析和成对比较显示,几乎所有单倍群的平均头部形状都存在差异。然而,平均叉尾形状的成对比较只显示出三个单倍群之间的差异。使用判别分析无法对所有单倍群进行正确分类。在所分析的单倍群的环境生态位之间发现了重要的差异。每个单倍群的生态位模型没有预测其他单倍群在气候上的适宜区域,揭示了环境条件的差异。在至少两个单倍群之间发现了显著差异,表明它们之间有不同的环境偏好。我们的研究结果表明,形态计量学变化的分析和定义气候生态位的环境条件的表征可以用来改进构成隐蔽物种的苍白锥虫单倍群的划界。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geometric morphometrics and ecological niche modelling for delimitation of Triatoma pallidipennis (Hemiptera: Reduviidae: Triatominae) haplogroups

A recent phylogenetic analysis of Triatoma pallidipennis, an important Chagas disease vector in Mexico, based on molecular markers, revealed five monophyletic haplogroups with validity as cryptic species. Here, we compare T. pallidipennis haplogroups using head and pronotum features, environmental characteristics of their habitats, and ecological niche modeling. To analyze variation in shape, images of the head and pronotum of the specimens were obtained and analyzed using methods based on landmarks and semi-landmarks. Ecological niche models were obtained from occurrence data, as well as a set of bioclimatic variables that characterized the environmental niche of each analyzed haplogroup. Deformation grids for head showed a slight displacement towards posterior region of pre-ocular landmarks. Greatest change in head shape was observed with strong displacement towards anterior region of antenniferous tubercle. Procrustes ANOVA and pairwise comparisons showed differences in mean head shape in almost all haplogroups. However, pairwise comparisons of mean pronotum shape only showed differences among three haplogroups. Correct classification of all haplogroups was not possible using discriminant analysis. Important differences were found among the environmental niches of the analyzed haplogroups. Ecological niche models of each haplogroup did not predict the climatic suitability areas of the other haplogroups, revealing differences in environmental conditions. Significant differences were found between at least two haplogroups, demonstrating distinct environmental preferences among them. Our results show how the analysis of morphometric variation and the characterization of the environmental conditions that define the climatic niche can be used to improve the delimitation of T. pallidipennis haplogroups that constitute cryptic species.

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