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.
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.xlsx
Drepanotrema 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.txt
Drepanotrema 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.txt
Aplexa 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.xls
Aplexa 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.txt
Aplexa 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.txt
Habitat 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.txt
Habitat 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