Divergence in Body Mass, Wing Loading, and Population Structure Reveals Species-Specific and Potentially Adaptive Trait Variation Across Elevations in Montane Bumble Bees
Divergence in Body Mass, Wing Loading, and Population Structure Reveals Species-Specific and Potentially Adaptive Trait Variation Across Elevations in Montane Bumble Bees
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DOI：
10.1093/isd/ixab012
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发表时间：
2021-09
影响因子：
3.4
通讯作者：
Jeffrey D. Lozier;Zachary M Parsons;Lois Rachoki;J. Jackson;Meaghan L Pimsler;K. Oyen;J. Strange;M. Dillon
中科院分区：
文献类型：
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作者：
Jeffrey D. Lozier;Zachary M Parsons;Lois Rachoki;J. Jackson;Meaghan L Pimsler;K. Oyen;J. Strange;M. Dillon
沿环境梯度形态学中的生物地理座椅可以照亮影响物种内部和物种之间特征进化的力。长期以来一直将纬度作为形态座的驱动力研究，重点是体型和温度。但是，抵消环境压力可能对体型施加限制。在山地景观中，空气密度下降的升高会对挥发性物种的飞行性能产生负面影响，这可能有助于选择减少体重，尽管温度下降。我们检查了两种大黄蜂（膜翅目：阿皮德（Apidae）：Bombus latreille）的形态，即温哥华·克雷森（Bombus Vancouverensis Cresson）和孟买·沃斯尼斯基（Bombus vosnesskii Radoszkowski），遍布加利福尼亚州，俄勒冈州山区，俄勒冈州和华盛顿州的山区。我们结合了种群基因组数据，以研究基因组血统与形态差异之间的关系。我们发现，温哥华B.倾向于更专业地用于高海拔，它表现出更强的空间环境变化，在其范围的南部和更高的海拔部位较小，并且在高翼载荷（相对于机翼质量）的高度较小（质量相对于机翼面积）。海拔。 Bombus Vosnesskii更像是一种高度的通才，具有很大的特征变化，但是空间环境相关性较弱。在较小的温哥华河畔，种群结构更强，在考虑遗传结构后，我们发现高程和机翼负荷之间存在显着关联，这表明这种飞行性能性状的局部适应可能性。我们的发现表明，体型趋势的一些相互矛盾的结果可能源于影响Bumble Bee生态学不同方面的不同环境压力，并且不同的物种在同一地区显示出不同的形态学岩石。
Biogeographic clines in morphology along environmental gradients can illuminate forces influencing trait evolution within and between species. Latitude has long been studied as a driver of morphological clines, with a focus on body size and temperature. However, counteracting environmental pressures may impose constraints on body size. In montane landscapes, declines in air density with elevation can negatively impact flight performance in volant species, which may contribute to selection for reduced body mass despite declining temperatures. We examine morphology in two bumble bee (Hymenoptera: Apidae: Bombus Latreille) species, Bombus vancouverensis Cresson and Bombus vosnesenskii Radoszkowski, across mountainous regions of California, Oregon, and Washington, United States. We incorporate population genomic data to investigate the relationship between genomic ancestry and morphological divergence. We find that B. vancouverensis, which tends to be more specialized for high elevations, exhibits stronger spatial-environmental variation, being smaller in the southern and higher elevation parts of its range and having reduced wing loading (mass relative to wing area) at high elevations. Bombus vosnesenskii, which is more of an elevational generalist, has substantial trait variation, but spatial-environmental correlations are weak. Population structure is stronger in the smaller B. vancouverensis, and we find a significant association between elevation and wing loading after accounting for genetic structure, suggesting the possibility of local adaptation for this flight performance trait. Our findings suggest that some conflicting results for body size trends may stem from distinct environmental pressures that impact different aspects of bumble bee ecology, and that different species show different morphological clines in the same region.