Glacial refugia and modern genetic diversity of 22 western North American tree species

Proceedings. Biological Sciences
David R Roberts, Andreas Hamann

Abstract

North American tree species, subspecies and genetic varieties have primarily evolved in a landscape of extensive continental ice and restricted temperate climate environments. Here, we reconstruct the refugial history of western North American trees since the last glacial maximum using species distribution models, validated against 3571 palaeoecological records. We investigate how modern subspecies structure and genetic diversity corresponds to modelled glacial refugia, based on a meta-analysis of allelic richness and expected heterozygosity for 473 populations of 22 tree species. We find that species with strong genetic differentiation into subspecies had widespread and large glacial refugia, whereas species with restricted refugia show no differentiation among populations and little genetic diversity, despite being common over a wide range of environments today. In addition, a strong relationship between allelic richness and the size of modelled glacial refugia (r(2) = 0.55) suggest that population bottlenecks during glacial periods had a pronounced effect on the presence of rare alleles.

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Citations

Oct 27, 2016·BMC Evolutionary Biology·Mathieu LatutrieFrancine Tremblay
Nov 19, 2017·Nature Communications·Ryan R BracewellJeffrey M Good
Sep 25, 2017·Ecology Letters·Candice Y LumibaoJason McLachlan
Oct 23, 2018·Molecular Ecology·Alexis MarchesiniGentile Francesco Ficetola
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Aug 5, 2020·Genetica·Nicholas P TipperyRachel L Bautzmann
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Jul 28, 2018·Proceedings. Biological Sciences·R R BracewellD L Six
May 26, 2018·American Journal of Botany·Markus S DillenbergerAaron Liston
Feb 5, 2019·ZooKeys·David W Langor
Feb 23, 2020·Ecology and Evolution·Joseph D NapierFeng Sheng Hu
Apr 23, 2021·Evolution; International Journal of Organic Evolution·Megan BontragerAmy L Angert
Sep 6, 2021·Molecular Ecology·Rebecca S TaylorPaul J Wilson

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