Alpine ecosystems are facing rapid human-induced environmental changes, and so more knowledge about tree adaptive potential is needed. This study investigated the relative role of isolation by distance (IBD) versus isolation by adaptation (IBA) in explaining population genetic structure in Abies alba and Larix decidua, based on 231 and 233 single nucleotide polymorphisms (SNPs) sampled across 36 and 22 natural populations, respectively, in the Alps and Apennines. Genetic structure was investigated for both geographical and environmental groups, using analysis of molecular variance (AMOVA). For each species, nine environmental groups were defined using climate variables selected from a multiple factor analysis. Complementary methods were applied to identify outliers based on these groups, and to test for IBD versus IBA. AMOVA showed weak but significant genetic structure for both species, with higher values in L. decidua. Among the potential outliers detected, up to two loci were found for geographical groups and up to seven for environmental groups. A stronger effect of IBD than IBA was found in both species; nevertheless, once spatial effects had been removed, temperature and soil in A. alba, and precipitation in both species, were relevant factors explaining genetic structure. Based on our findings, in the Alpine region, genetic structure seems to be affected by both geographical isolation and environmental gradients, creating opportunities for local adaptation.

Mosca, E.; Gonzalez Martinez, S.C.; Neale, D.B. (2014). Environmental versus geographical determinants of genetic structure in two subalpine conifers. NEW PHYTOLOGIST, 201 (1): 180-192. doi: 10.1111/nph.12476 handle: http://hdl.handle.net/10449/22590

Environmental versus geographical determinants of genetic structure in two subalpine conifers

Mosca, Elena;Neale, David Bryan
2014-01-01

Abstract

Alpine ecosystems are facing rapid human-induced environmental changes, and so more knowledge about tree adaptive potential is needed. This study investigated the relative role of isolation by distance (IBD) versus isolation by adaptation (IBA) in explaining population genetic structure in Abies alba and Larix decidua, based on 231 and 233 single nucleotide polymorphisms (SNPs) sampled across 36 and 22 natural populations, respectively, in the Alps and Apennines. Genetic structure was investigated for both geographical and environmental groups, using analysis of molecular variance (AMOVA). For each species, nine environmental groups were defined using climate variables selected from a multiple factor analysis. Complementary methods were applied to identify outliers based on these groups, and to test for IBD versus IBA. AMOVA showed weak but significant genetic structure for both species, with higher values in L. decidua. Among the potential outliers detected, up to two loci were found for geographical groups and up to seven for environmental groups. A stronger effect of IBD than IBA was found in both species; nevertheless, once spatial effects had been removed, temperature and soil in A. alba, and precipitation in both species, were relevant factors explaining genetic structure. Based on our findings, in the Alpine region, genetic structure seems to be affected by both geographical isolation and environmental gradients, creating opportunities for local adaptation.
Environmental gradient
Isolation by adaptation
Isolation by distance
Landscape genetics
Outlier locus detection
Genetica forestale
Settore BIO/18 - GENETICA
Mosca, E.; Gonzalez Martinez, S.C.; Neale, D.B. (2014). Environmental versus geographical determinants of genetic structure in two subalpine conifers. NEW PHYTOLOGIST, 201 (1): 180-192. doi: 10.1111/nph.12476 handle: http://hdl.handle.net/10449/22590
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10449/22590
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