Effects of landscapes and range expansion on population structure and local adaptation

• DOI: 10.1111/nph.16619
• Publication Date: 2020-04-23T06:55:48Z
• Authors: Wei Zhao; Yan‐Qiang Sun; Jin Pan; Alexis R. Sullivan; Michael L. Arnold; Jian‐Feng Mao; Xiao‐Ru Wang
• Keywords: Local adaptation; Nucleotide diversity

Summary Understanding the origin and distribution of genetic diversity across landscapes is critical for predicting future organisms in changing climates. This study investigated how adaptive demographic forces have shaped population structure Pinus densata , a keystone species on Qinghai‐Tibetan Plateau (QTP). We examined genomic range P. using exome capture sequencing. applied spatially explicit tests to dissect impacts allele surfing, geographic isolation environmental gradients differentiation forecasted this legacy may limit persistence found that surfing from expansion could explain 39% c . 48 000 genotyped single nucleotide polymorphisms (SNPs). Uncorrected, these frequency clines severely confounded inferences selection. After controlling processes, isolation‐by‐environment explained 9.2–19.5% structure, with 4.0% loci being affected by Allele genotype–environment associations resulted mismatch under projected climate scenarios. illustrate significant local adaptation, when coupled reduced as result history, constrains potential evolutionary response change. The strong signal vulnerability be representative other QTP endemics.