DOI: 10.5061/dryad.m874p
title: Data from: Environment not dispersal limitation drives clonal composition of arctic Daphnia in a recently deglaciated area

description: One of the most prominent manifestations of the ongoing climate warming is
 the retreat of glaciers and ice sheets around the world. Retreating
 glaciers result in the formation of new ponds and lakes, which are
 available for colonization. The gradual appearance of these new habitat
 patches allows us to determine to what extent the composition of asexual
 Daphnia (water flea) populations is affected by environmental drivers
 versus dispersal limitation. Here we used a landscape genetics approach to
 assess the processes structuring the clonal composition of species in the
 D. pulex species complex that have colonized periglacial habitats created
 by ice-sheet retreat in western Greenland. We analyzed 61 populations from
 a young (&lt;50 y) and an old cluster (&gt;150 y) of lakes and
 ponds. We identified 42 asexual clones that varied widely in spatial
 distribution. Beta diversity was higher among older than among younger
 systems. Lineage sorting by the environment explained 14% of the variation
 in clonal composition whereas the pure effect of geographic distance was
 very small and statistically insignificant (Radj2 = 0.010, p= 0.085).
 Dispersal limitation did not seem important, even among young habitat
 patches. The observation of several tens of clones colonizing the area
 combined with environmentally-driven clonal composition of populations
 illustrates that population assembly of asexual species in the arctic is
 structured by environmental gradients reflecting differences in the
 ecology of clones.
description: Sampling locations and
 environmental data from Jakobshavn Isbræ region of western
 GreenlandGeographic coordinates
 (UTM readings), pH, water temperature, altitude, depth, area and distance
 to ice sheet collected in the field and nutrients (Total nitrogen, Total
 phosphorus and chlorophyll-a) determined in the laboratory from water
 samples collected during field sampling.Geographic location and
 Environmental data.txtClones and their
 abuandance in the habitat detectedKX024528-KX024565DNA Sequence data used for species identification were submitted to GenBank® and deposited for Haileselasie et al. (2016) Colonization history and clonal richness of asexual Daphnia in periglacial habitats of contrasting age in West Greenland in Journal of Animal Ecology (doi:10.1111/1365-2656.12513). They are available from the NCBI PopSet database under accession number 1015802155, or in GenBank® under individual accession numbers KX024528-KX024565.Dryad® Digital RepositoryThis files includes the R packages we used in our analysis. The input data and names of variables are the same as those used in the main text. ENV= environmental variables, SPACE +spatial distance, HAB=Habitat (pond vs lake) and AGE = represented by distance and dummy variables for old and youngDryad® Digital Repository-polysat-input-dataColumn A rows 1-12780 indicate name of individuals and population they belong to followed by number referring to population and individual organism's number, respectively. The letter "L" refers to lake habitat and "p" for pond habitat. Column B contains list of 9 microsatellite markers from Colbourne et al. (2004) Molecular Ecology Notes 4, 485-490) and column C through F lists number of alleles for each individual organisms at the respective microsatellite markers. Column G refers to DNA-code used and column H is multi-locus genotype and column I is code of clones used in the main text and supplementary material.