Phylogeography and phenotypic wing shape variation in a damselfly across populations in Europe

IF 3.4 Q1 Agricultural and Biological Sciences
Y. Yildirim, D. Kristensson, D. Outomuro, D. Mikolajewski, P. Rödin Mörch, S. Sniegula, F. Johansson
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引用次数: 0

Abstract

Describing geographical variation in morphology of organisms in combination with data on genetic differentiation and biogeography can provide important information on how natural selection shapes such variation. Here we study genetic structure using ddRAD seq and wing shape variation using geometric morphometrics in 14 populations of the damselfly Lestes sponsa along its latitudinal range in Europe. The genetic analysis showed a significant, yet relatively weak population structure with high genetic heterozygosity and low inbreeding coefficients, indicating that neutral processes contributed very little to the observed wing shape differences. The genetic analysis also showed that some regions of the genome (about 10%) are putatively shaped by selection. The phylogenetic analysis showed that the Spanish and French populations were the ancestral ones with northern Swedish and Finnish populations being the most derived ones. We found that wing shape differed significantly among populations and showed a significant quadratic (but weak) relationship with latitude. This latitudinal relationship was largely attributed to allometric effects of wing size, but non-allometric variation also explained a portion of this relationship. However, wing shape showed no phylogenetic signal suggesting that lineage-specific variation did not contribute to the variation along the latitudinal gradient. In contrast, wing size, which is correlated with body size in L. sponsa, had a strong negative correlation with latitude. Our results suggest a relatively weak population structure among the sampled populations across Europe, but a clear differentiation between south and north populations. The observed geographic phenotypic variation in wing shape may have been affected by different local selection pressures or environmental effects.
一种豆娘在欧洲不同种群间的系统地理学和表型翅形变异
将生物形态的地理变异与遗传分化和生物地理学数据结合起来进行描述,可以提供有关自然选择如何形成这种变异的重要信息。在此,我们利用 ddRAD seq 研究了豆娘的遗传结构,并利用几何形态计量学研究了豆娘在欧洲 14 个种群中的翅形变异。遗传分析表明,种群结构显著但相对较弱,遗传杂合度高,近交系数低,这表明中性过程对观察到的翅膀形状差异的影响很小。遗传分析还表明,基因组的某些区域(约 10%)可能是由选择形成的。系统发育分析表明,西班牙和法国种群是最古老的种群,而瑞典北部和芬兰种群是最衍生的种群。我们发现,不同种群之间的翅形差异很大,并且与纬度呈显著的二次方(但较弱)关系。这种纬度关系主要归因于翅膀大小的异速效应,但非异速变化也解释了这种关系的一部分。然而,翅膀形状没有显示出系统发育的信号,这表明纬度梯度的变化并不是由特定世系的变异造成的。与此相反,翅的大小与 L. sponsa 的体型相关,但与纬度呈强烈的负相关。我们的研究结果表明,欧洲采样种群之间的种群结构相对较弱,但南北种群之间有明显的分化。观察到的翅膀形状的地理表型差异可能受到了当地不同的选择压力或环境影响。
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来源期刊
BMC Evolutionary Biology
BMC Evolutionary Biology 生物-进化生物学
CiteScore
5.80
自引率
0.00%
发文量
0
审稿时长
6 months
期刊介绍: BMC Evolutionary Biology is an open access, peer-reviewed journal that considers articles on all aspects of molecular and non-molecular evolution of all organisms, as well as phylogenetics and palaeontology.
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