Distance, elevation and environment as drivers of diversity and divergence in bumble bees across latitude and altitude
Distance, elevation and environment as drivers of diversity and divergence in bumble bees across latitude and altitude
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DOI：
10.1111/mec.14735
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发表时间：
2018-07-01
影响因子：
4.9
通讯作者：
Lozier, Jeffrey D.
中科院分区：
文献类型：
--
作者：
Jackson, Jason M.;Pimsler, Meaghan L.;Lozier, Jeffrey D.
确定扩散限制和遗传分化的驱动因素是生物地理学研究的关键目标。本研究利用限制性位点相关DNA测序（RADseq）技术，对美国加利福尼亚州、俄勒冈州和华盛顿州两种大黄蜂（Bombus vosnesenskii）和双头大黄蜂（Bombus bifarius）进行了种群连通性和遗传多样性分析。它在大多数纬度上占据相对狭窄的高海拔生态位，表现出更强的种群分化，尽管这两个物种的基因流动最好的解释是与环境生态位抗性隔离。海拔高度栖息地宽度与遗传多样性之间的关系也很明显，在其分布范围内，b.s vosnesenskii表现出相对一致的遗传多样性水平，而b.s bifarius在低纬度地区的遗传多样性则有所降低，因为它局限于高海拔栖息地。本研究的结果强调了海拔范围和栖息地适宜性之间的交叉在影响种群连通性方面的重要性，并表明未来的气候变暖甚至会对目前联系良好的种群产生碎片化影响，因为它们在山地系统中向上追踪其热生态位。
Identifying drivers of dispersal limitation and genetic differentiation is a key goal in biogeography. We examine patterns of population connectivity and genetic diversity using restriction site-associated DNA sequencing (RADseq) in two bumble bee species, Bombus vosnesenskii and Bombus bifarius, across latitude and altitude in mountain ranges from California, Oregon and Washington, U.S.A. Bombus vosnesenskii, which occurs across a broader elevational range at most latitudes, exhibits little population structure while B.bifarius, which occupies a relatively narrow higher elevation niche across most latitudes, exhibits much stronger population differentiation, although gene flow in both species is best explained by isolation with environmental niche resistance. A relationship between elevational habitat breadth and genetic diversity is also apparent, with B.vosnesenskii exhibiting relatively consistent levels of genetic diversity across its range, while B.bifarius has reduced genetic diversity at low latitudes, where it is restricted to high-elevation habitat. The results of this study highlight the importance of the intersect between elevational range and habitat suitability in influencing population connectivity and suggest that future climate warming will have a fragmenting effect even on populations that are presently well connected, as they track their thermal niches upward in montane systems.