Data from: The influence of landscape, climate, and history on spatial genetic patterns in keystone plants (Azorella) on sub-Antarctic islands ...

• Main Authors: Chau, John, Born, Céline, McGeoch, Melodie, Bergstrom, Dana, Shaw, Justine, Terauds, Aleks, Mairal, Mario, Le Roux, Johannes, Van Vuuren, Bettine
• Format: Dataset
• Language: English
• Published: Dryad 2019
• Subjects: Azorella macquariensis; Azorella selago; Holocene; Antarc*; Antarctic; Macquarie Island; Marion Island; polar desert
• Online Access: https://dx.doi.org/10.5061/dryad.cr12t51; https://datadryad.org/stash/dataset/doi:10.5061/dryad.cr12t51

The distribution of genetic variation in species is governed by factors that act differently across spatial scales. To tease apart the contribution of different processes, especially at intermediate spatial scales, it is useful to study simpler ecosystems such as those on sub-Antarctic oceanic islands. In this study, we characterize spatial genetic patterns of two keystone plant species, Azorella selago on sub-Antarctic Marion Island and Azorella macquariensis on sub-Antarctic Macquarie Island. Although both islands experience a similar climate and vegetation structure, they differ significantly in topography and geological history. We genotyped six microsatellites for 1149 individuals from 123 sites across Marion Island and 372 individuals from 42 sites across Macquarie Island. We tested for spatial patterns in genetic diversity, including correlation with elevation and vegetation type, and clines in different directional bearings. We also examined genetic differentiation within islands, ... : Chauetal_Azorella_SupplTableS1_sitesSupplemental Information - Table S1. Environmental and genotypic characteristics for each site of Azorella selago on Marion Island using 6 microsatellite loci and for each site of A. macquariensis on Macquarie Island using 5 microsatellite loci, including latitude, longitude, elevation, vegetation type (C: coastal, F: fellfield, M: mire-slope, P: polar desert; for Marion Island only), number of individuals sampled (N), and mean values across loci for number of alleles (A), number of alleles adjusted by rarefaction to 10 samples per site (AR), observed heterozygosity (HO), expected heterozygosity (HE), fixation index/inbreeding coefficient (FIS), and proportion of pairwise FST that were significant (p < 0.05), with overall means and standard deviations for each island in last row.Chauetal_Azorella_SupplTableS2_samplesSupplemental Information - Table S2. Microsatellite genotypes, coded as integer size in base pairs, in GENALEX input format, for each sample of Azorella ...