ArticleMolecular ecology2026
Differential Demographic Trajectories and Polygenic Adaptation to Monsoon Seasonality in Sky Island Hercules Beetle Populations of the American Southwest.
Article in Molecular ecology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Sky island mountain ranges of the American Southwest represent isolated habitat fragments surrounded by arid lowland barriers, making them powerful natural experiments for studying population divergence, demographic history and local adaptation. Here, we use whole-genome resequencing of the Western Hercules beetle (Dynastes grantii Horn, 1870) across four primary lineages to characterize the genomic consequences of habitat fragmentation and climate-driven isolation. Population structure analyses revealed strong hierarchical genetic differentiation consistent with isolation-by-distance, while ABBA-BABA tests detected little to no evidence of post-divergence gene flow among lineages. Coalescent modelling revealed synchronous demographic expansions during the Last Glacial Period followed by severe Holocene contractions across all lineages, with the Utah population experiencing the most pronounced bottleneck and maintaining persistently low effective population size (N
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