Global patterns of population genetic differentiation in seed plants

被引:58
作者
Gamba, Diana [1 ]
Muchhala, Nathan [1 ]
机构
[1] Univ Missouri, Dept Biol, 8001 Nat Bridge Rd, St Louis, MO 63121 USA
关键词
F-ST; latitudinal region; life history traits; pollination mode; population differentiation; population genetic structure; PHYLOGENETIC SIGNAL; POLLEN DISPERSAL; LIFE-HISTORY; ENVIRONMENTAL HETEROGENEITY; LATITUDINAL VARIATION; GLOSSOPHAGA-SORICINA; MOUNTAIN PASSES; EUGLOSSINE BEES; MATING SYSTEMS; F-STATISTICS;
D O I
10.1111/mec.15575
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Evaluating the factors that drive patterns of population differentiation in plants is critical for understanding several biological processes such as local adaptation and incipient speciation. Previous studies have given conflicting results regarding the significance of pollination mode, seed dispersal mode, mating system, growth form and latitudinal region in shaping patterns of genetic structure, as estimated byF(ST)values, and no study to date has tested their relative importance together across a broad scale. Here, we assembled a 337-species data set for seed plants from publications with data onF(ST)from nuclear markers and species traits, including variables pertaining to the sampling scheme of each study. We used species traits, while accounting for sampling variables, to perform phylogenetic multiple regressions. Results demonstrated thatF(ST)values were higher for tropical, mixed-mating, non-woody species pollinated by small insects, indicating greater population differentiation, and lower for temperate, outcrossing trees pollinated by wind. Among the factors we tested, latitudinal region explained the largest portion of variance, followed by pollination mode, mating system and growth form, while seed dispersal mode did not significantly relate toF(ST). Our analyses provide the most robust and comprehensive evaluation to date of the main ecological factors predicted to drive population differentiation in seed plants, with important implications for understanding the basis of their genetic divergence. Our study supports previous findings showing greater population differentiation in tropical regions and is the first that we are aware of to robustly demonstrate greater population differentiation in species pollinated by small insects.
引用
收藏
页码:3413 / 3428
页数:16
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