biostudies-literatureSu TNatural Science Foundation of Jiangxi ProvinceNational Natural Science Foundation of Chinae8863https://www.ebi.ac.uk/biostudies/studies/S-EPMC9035574biostudies-literatureUnknown12(4)Diet specialization may affect the population genetic structure of pollinators by reducing gene flow and driving genetic differentiation, especially in pollen-specialist bees. <i>Colletes gigas</i> is a pollen-specialist pollinator of <i>Camellia oleifera</i>, one of the most important staple oil crops in China. <i>Ca</i>. <i>oleifera</i> blooms in cold climates and contains special compounds that make it an unusable pollen source to other pollinators. Thus, <i>C</i>. <i>gigas</i> undoubtedly plays a key role as the main pollinator of <i>Ca</i>. <i>oleifera</i>, with biological and economic significance. Here, we use a population genomic approach to analyze the roles of geography and climate on the genetic structure, genetic diversity, and demographic history of <i>C</i>. <i>gigas</i>. A tEcology and evolutionPopulation genomics and phylogeography of <i>Colletes gigas</i>, a wild bee specialized on winter flowering plants.PMC903557420212ACB2050063186010532100336Su TJiang KHuang ZLin GZhao FHe BfalsePopulation genomics and phylogeography of <i>Colletes gigas</i>, a wild bee specialized on winter flowering plants.Diet specialization may affect the population genetic structure of pollinators by reducing gene flow and driving genetic differentiation, especially in pollen-specialist bees. <i>Colletes gigas</i> is a pollen-specialist pollinator of <i>Camellia oleifera</i>, one of the most important staple oil crops in China. <i>Ca</i>. <i>oleifera</i> blooms in cold climates and contains special compounds that make it an unusable pollen source to other pollinators. Thus, <i>C</i>. <i>gigas</i> undoubtedly plays a key role as the main pollinator of <i>Ca</i>. <i>oleifera</i>, with biological and economic significance. Here, we use a population genomic approach to analyze the roles of geography and climate on the genetic structure, genetic diversity, and demographic history of <i>C</i>. <i>gigas</i>. A t2022-01-01T00:00:00Z2022 Apr2026-05-10T01:34:54.677Z2025-04-20T03:09:33.811ZS-EPMC90355743549450310.1002/ece3.8863