Data from: Discordance between nuclear and mitochondrial genomes in sexual and asexual lineages of the freshwater snail Potamopyrgus antipodarum

The presence and extent of mitonuclear discordance in coexisting sexual
and asexual lineages provides insight into 1) how and when asexual
lineages emerged, and 2) the spatial and temporal scales at which the
ecological and evolutionary processes influencing the evolution of sexual
and asexual reproduction occur. Here, we used nuclear single-nucleotide
polymorphism (SNP) markers and a mitochondrial gene to characterize
phylogeographic structure and the extent of mitonuclear discordance in
Potamopyrgus antipodarum. This New Zealand freshwater snail is often used
to study the evolution and maintenance of sex because obligately sexual
and obligately asexual individuals often coexist. While our data indicate
that sexual and asexual P. antipodarum sampled from the same lake
population are often genetically similar, suggesting recent origin of
these asexuals from sympatric sexual P. antipodarum, we also found
significantly more population structure in sexuals vs. asexuals. This
latter result suggests that some asexual lineages originated in other
lakes and/or in the relatively distant past. When comparing mitochondrial
and nuclear population genetic structure, we discovered that one
mitochondrial haplotype (‘1A’) was rare in sexuals, but common and
widespread in asexuals. Haplotype 1A frequency and nuclear genetic
diversity were not associated, suggesting that the commonness of this
haplotype cannot be attributed entirely to genetic drift and pointing
instead to a role for selection.