DOI: 10.5061/dryad.bg79cnpd3
title: Data from: Genetic patterns of Magnolia in the Lesser Antilles: Stepwise colonisation leading to highly inbred island ‘populations’

description: Aim: Test for genetic signatures of island biogeographic patterns, using a
 slowly evolving, recent colonist with a low dispersal capability in an
 island chain without linear chronosequence; evaluate the multiple-endemic
 status of the species; and quantify genetic diversity of extant island
 populations. Location: The Lesser Antilles (Caribbean). Taxon: Magnolia
 dodecapetala (Magnoliaceae). Methods: Genetic diversity was characterised
 using Sanger sequencing of 21 individuals amplified for 11 DNA markers,
 plus microsatellite data of 195 individuals genotyped with 19 simple
 sequence repeat (SSR) markers. Sanger sequencing data were used to
 construct a Bayesian phylogenetic hypothesis, while SSR markers were used
 to run approximate Bayesian computation (ABC) demographic analyses and
 calculate population statistics. Results: Both types of molecular data
 support stepwise colonization, decoupled from known island ages. The ABC
 analyses support a north to south migration while the Sanger sequencing
 data indicates a mixture of island progression rule and stepping stone
 dispersal. The SSR data show strong genetic structuring per island and
 significant inbreeding in all populations except in Saint Lucia. The
 lowest genetic diversity is found in the population from Saint Vincent. A
 high amount of genetic linkage occurs in a subpopulation from Dominica.
 Main conclusions: Biogeographic patterns for the complex geological
 setting of the Lesser Antilles are uncovered using a slowly evolving study
 species. All genetic data support treating each island as distinct
 Management Units for conservation and call for a re-evaluation of the
 species limits. Inbreeding threatens the survival of island populations
 and the populations of Saint Vincent and Dominica represent conservation
 priorities.
description: This data set was created from Table S2 of Veltjen et al. (2022),
 where all genotypes were recorded as a fragment size. We converted
 original fragment size data into repeat number one for ABC analysis. This
 data set contains 15 microsatellite genotypes of 195 Magnolia dodecapetala
 individuals from 5 island populations (SV, SL, M, D and G). 
   Emily Veltjen, Ichiro Tamaki, Pieter
 Asselman, Paul Goetghebeur, Marie-Stéphanie Samain, Isabel Larridon (2022)
 Genetic patterns of Magnolia in the Lesser Antilles: stepwise colonisation
 leading to highly inbred island ‘populations’. Journal of Biogeography,
 accepted    ID, individual
 ID Pop, island population SubPop,
 sub population MA39_023a and MA39_023b, first and
 second alleles of locus MA39_023 in repeat number
 MA39_259a and MA39_259b, first and second alleles of locus
 MA39_259 in repeat number MA39_159a and MA39_159b,
 first and second alleles of locus MA39_159 in repeat number
 MA39_182a and MA39_182b, first and second alleles of locus
 MA39_182 in repeat number MA39_185a and MA39_185b,
 first and second alleles of locus MA39_185 in repeat number
 MA39_191a and MA39_191b, first and second alleles of locus
 MA39_191 in repeat number MA39_199a and MA39_199b,
 first and second alleles of locus MA39_199 in repeat number
 MA39_442a and MA39_442b, first and second alleles of locus
 MA39_442 in repeat number MA40_136a and MA40_136b,
 first and second alleles of locus MA40_136 in repeat number
 MA42_072a and MA42_072b, first and second alleles of locus
 MA42_072 in repeat number MA42_255a and MA42_255b,
 first and second alleles of locus MA42_255 in repeat number
 MA42_274a and MA42_274b, first and second alleles of locus
 MA42_274 in repeat number MA42_333a and MA42_333b,
 first and second alleles of locus MA42_333 in repeat number
 MA42_421a and MA42_421b, first and second alleles of locus
 MA42_421 in repeat number MA42_495a and MA42_495b,
 first and second alleles of locus MA42_495 in repeat number