Local adaptation across a complex bioclimatic landscape in two montane bumble bee species
Local adaptation across a complex bioclimatic landscape in two montane bumble bee species
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DOI：
10.1111/mec.15376
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发表时间：
2020-02-25
影响因子：
4.9
通讯作者：
Lozier, Jeffrey D.
中科院分区：
文献类型：
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作者：
Jackson, Jason M.;Pimsler, Meaghan L.;Lozier, Jeffrey D.
考虑到持续的气候变化，了解不同物种对温度和降水变化的进化反应具有重要意义。温度和降水对大黄蜂（Bombus）生物学多个方面的重要性，加上大地理范围使种群暴露于不同的环境压力，使这些昆虫非常适合研究当地适应性。在此，我们分析了两种广泛分布的大黄蜂，Bombus vosnesenskii和Bombus vancouver的全基因组序列数据，使用多种环境关联分析方法来研究不同纬度和海拔的气候适应。在b.s vanverensis中观察到最强的选择特征，尽管大多数位点在物种之间有独特的反应，但我们发现了一些共同的反应。与神经和神经肌肉功能以及离子运输相关的基因在温度变量方面尤为明显，而与角质层形成、气管和呼吸系统发育以及体内平衡相关的基因则与降水变量相关。因此，我们的数据表明，耐受非生物变异的适应性反应可能是复杂的，但即使对于这些复杂的特征和景观，物种之间也可能出现一些相似之处。研究结果为未来研究大黄蜂耐热和耐干燥机制提供了框架，并为未来的保护工作提供了一组基因组目标。
Understanding evolutionary responses to variation in temperature and precipitation across species ranges is of fundamental interest given ongoing climate change. The importance of temperature and precipitation for multiple aspects of bumble bee (Bombus) biology, combined with large geographic ranges that expose populations to diverse environmental pressures, make these insects well-suited for studying local adaptation. Here, we analyzed genome-wide sequence data from two widespread bumble bees, Bombus vosnesenskii and Bombus vancouverensis, using multiple environmental association analysis methods to investigate climate adaptation across latitude and altitude. The strongest signatures of selection were observed in B. vancouverensis, but despite unique responses between species for most loci, we detected several shared responses. Genes relating to neural and neuromuscular function and ion transport were especially evident with respect to temperature variables, while genes relating to cuticle formation, tracheal and respiratory system development, and homeostasis were associated with precipitation variables. Our data thus suggest that adaptive responses for tolerating abiotic variation are likely to be complex, but that several parallels among species can emerge even for these complex traits and landscapes. Results provide the framework for future work into mechanisms of thermal and desiccation tolerance in bumble bees and a set of genomic targets that might be monitored for future conservation efforts.