DOI: 10.5061/dryad.52c2h
title: Data from: Variation in habitat connectivity generates positive correlations between species and genetic diversity in a metacommunity

description: An increasing number of studies are simultaneously investigating species
 diversity (SD) and genetic diversity (GD) in the same systems, looking for
 ‘species– genetic diversity correlations’ (SGDCs). From negative to
 positive SGDCs have been reported, but studies have generally not
 quantified the processes underlying these correlations. They were also
 mostly conducted at large biogeographical scales or in recently degraded
 habitats. Such correlations have not been looked for in natural networks
 of connected habitat fragments (metacommunities), and the underlying
 processes remain elusive in most systems. We investigated these issues by
 studying freshwater snails in a pond network in Guadeloupe (Lesser
 Antilles). We recorded SD and habitat characteristics in 232 ponds and
 assessed GD in 75 populations of two species. Strongly significant and
 positive SGDCs were detected in both species. Based on a decomposition of
 SGDC as a function of variance–covariance of habitat characteristics, we
 showed that connectivity (opportunity of water flow between a site and the
 nearest watershed during the rainy season) has the strongest contribution
 on SGDCs. More connective sites received both more alleles and more
 species through immigration resulting in both higher GD and higher SD.
 Other habitat characteristics did not contribute, or contributed
 negatively, to SGDCs. This is true of the desiccation frequency of ponds
 during the dry season, presumably because species markedly differ in their
 ability to tolerate desiccation. Our study shows that variation in
 environmental characteristics of habitat patches can promote SGDCs at
 metacommunity scale when the studied species respond homogeneously to
 these environmental characteristics.
description: Drepanotrema
 depressissimum microsatellite genotypes (GenAlEx)Drepanotrema
 depressissimum microsatellite genotypes as GenAlEx format. For more
 information on sampling locations see the corresponding habitat
 characteristics data file.D_depressissimum_GenAlEx.xlsxDrepanotrema depressissimum microsatellite genotypes (Genepop)Drepanotrema depressissimum microsatellite genotypes as genepop format. For more information on sampling locations see the corresponding habitat characteristics data file.D_depressissimum_Genepop.txtDrepanotrema depressissimum microsatellite genotypes (Rmes)Drepanotrema depressissimum microsatellite genotypes as Rmes format. Rmes estimates unbiased selfing rates from population genetic data, for more information or to download the Rmes sofware see :http://www.cefe.cnrs.fr/en/genetique-et-ecologie-evolutive/patrice-david.D_depressissimum_Rmes.txtAplexa marmorata microsatellite genotypes (GenAlEx)Aplexa marmorata microsatellite genotypes asGenAlEx format. For more information on sampling locations see the corresponding habitat characteristics data file.A_marmorata_GenAlEx.xlsAplexa marmorata microsatellite genotypes (Genepop)Aplexa marmorata microsatellite genotypes as genepop format. For more information on sampling locations see the corresponding habitat characteristics data file.A_marmorata_Genepop.txtAplexa marmorata microsatellite genotypes (Rmes)Aplexa marmorata microsatellite genotypes as Rmes format. Rmes estimates unbiased selfing rates from population genetic data, for more information or to download the Rmes sofware see :http://www.cefe.cnrs.fr/en/genetique-et-ecologie-evolutive/patrice-david.A_marmorata_Rmes.txtHabitat characteristics (Drepanotrema depressissimum sites)Habitat characteristics of the 32 sites where Drepanotrema depressissimum has been sampled for genetic analysis. "Lat" and "Long" are site latitude and longitude respectively (WGS84). "Year" is the sampling year. "Si", "V", "C", "St" and "G" are the five habitat characteristics used in the study (see the Materials and methods for more details). "SR", "SR_Pulmonates" and "SR_Caenogastropods" are long-term estimations of total species richness, Pulmonate species richness, and Caenogastropod species richness respectively.D_depressissimum_Habitat_characteristics.txtHabitat characteristics (Aplexa marmorata sites)Habitat characteristics of the 43 sites where Aplexa marmorata has been sampled for genetic analysis. "Lat" and "Long" are site latitude and longitude respectively (WGS84). "Year" is the sampling year. "Si", "V", "C", "St" and "G" are the five habitat characteristics used in the study (see the materials and methods for more details). "SR", "SR_Pulmonates" and "SR_Caenogastropods" are long-term estimations of total species richness, Pulmonate species richness, and Caenogastropod species richness respectively.A_marmorata_Habitat_characteristics.txt