Microgeographic Patterns of Genetic Divergence and Adaptation across Environmental Gradients in Boechera stricta (Brassicaceae)

被引:60
作者
Anderson, Jill T. [1 ,2 ,3 ]
Perera, Nadeesha [4 ]
Chowdhury, Bashira [3 ]
Mitchell-Olds, Thomas [4 ]
机构
[1] Univ Georgia, Dept Genet, Athens, GA 30602 USA
[2] Univ Georgia, Odum Sch Ecol, Athens, GA 30602 USA
[3] Rocky Mt Biol Labs, Crested Butte, CO 81224 USA
[4] Duke Univ, Dept Biol, Durham, NC 27708 USA
关键词
environmental gradient; fecundity; fitness; germination success; microsatellite; common garden experiment; subalpine meadow; LOCAL ADAPTATION; CLIMATE-CHANGE; CLARKIA-XANTIANA; PLANT; FLOW; RESPONSES; SELECTION; DIFFERENTIATION; CONSTRAINTS; POPULATIONS;
D O I
10.1086/682404
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Abiotic and biotic conditions often vary continuously across the landscape, imposing divergent selection on local populations. We used a provenance trial approach to examine microgeographic variation in local adaptation in Boechera stricta (Brassicaceae), a perennial forb native to the Rocky Mountains. In montane ecosystems, environmental conditions change considerably over short spatial scales, such that neighboring populations can be subject to different selective pressures. Using accessions from southern (Colorado) and northern (Idaho) populations, we characterized spatial variation in genetic similarity via microsatellite markers. We then transplanted genotypes from multiple local populations into common gardens in both regions. Continuous variation in local adaptation emerged for several components of fitness. In Idaho, genotypes from warmer environments (low-elevation or south-facing sites) were poorly adapted to the north-facing garden. In high- and low-elevation Colorado gardens, susceptibility to insect herbivory increased with source elevation. In the high-elevation Colorado garden, germination success peaked for genotypes that evolved at elevations similar to that of the garden and decreased for genotypes from higher and lower elevations. We also found evidence for local maladaptation in survival and fecundity components of fitness in the low-elevation Colorado garden. This approach is a first step in predicting how global change could affect evolutionary dynamics.
引用
收藏
页码:S60 / S73
页数:14
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