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4 results for “Scurria”
Single nucleotide polymorphism (SNPs) data for Scurria scurra, Scurria variabilis, Scurria ceciliana and Scurria araucana
<p>The distribution of genetic diversity is often heterogeneous in space, and it usually correlates with environmental transitions or historical processes that affect demography. The coast of Chile encompasses two biogeographic provinces and spans a broad environmental gradient together with oceanographic processes linked to coastal topography that can affect species' genetic diversity. Here, we evaluated the genetic connectivity and historical demography of four <em>Scurria</em> limpets, <em>S. scurra, S. variabilis, S. ceciliana</em> and <em>S. araucana</em>, between ca. 19° S and 53° S in the Chilean coast using genome-wide SNPs markers. Genetic structure varied among species which was evidenced by species-specific breaks together with two shared breaks. One of the shared breaks was located at 22–25° S and was observed in <em>S. araucana</em> and <em>S. variabilis</em>, while the second break around 31–34° S was shared by three <em>Scurria</em> species. Interestingly, the identified genetic breaks are also shared with other low-disperser invertebrates. Demographic histories show bottlenecks in <em>S. scurra</em> and <em>S. araucana</em> populations and recent population expansion in all species. The shared genetic breaks can be linked to oceanographic features acting as soft barriers to dispersal and also to historical climate, evidencing the utility of comparing multiple and sympatric species to understand the influence of a particular seascape on genetic diversity.</p>
Single nucleotide polymorphism (SNPs) data for Scurria scurra, Scurria variabilis, Scurria ceciliana and Scurria araucana
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Population genomic analyses reveal hybridization and marked differences in genetic structure and demographic history of Scurria limpet sister species with parapatric distributions across the southeastern pacific
<p>The study of sister species that occur in parapatry around biogeographic transition zones can help understand the evolutionary processes that underlie the changes in species composition across biogeographic transition zones. The South Eastern Pacific (SEP) coast is a highly productive coastal system that exhibits a broad biogeographic transition zone around 30–35ºS. Here, we present a comparative genome-wide analysis of the sister species <em>Scurria viridula</em> and <em>Scurria zebrina</em>, that occur in parapatry and whose poleward and equatorward range edges intersect in the 30–35ºS SEP biogeographic transition zone. We sampled 118 specimens sourced from nine sites from Tocopilla (22ºS) to Chiloé (41ºS) including one site where both species overlap and analyzed over 8,000 biallelic single nucleotide polymorphisms. We found evidence of hybridization between these species in the contact zone and found significant but contrasting population structures for both species. Our results indicate that the genetic structure in <em>S. viridula</em>, which is currently expanding its range poleward, follows a simple isolation-by-distance model with no traces of natural selection (no evidence of outlier loci). In contrast, <em>S. zebrina</em>, which finds its equatorward range edge at the transition zone, displayed a pronounced genetic break approximately at 32-34ºS, along a region of marked environmental heterogeneity in association with a semi-permanent coastal upwelling regime. For <em>S. zebrina</em>, we also found 43 outlier loci associated with this genetic break, with a significant proportion of them clustering in a single linkage group. This marked difference in the presence of outlier loci between species suggests that they could be responding differently to local environmental challenges found at their overlapping geographic range edges, thus providing important new insights about genomic changes around biogeographic transition zones in sister species and the forces that shape genetic diversity in intertidal marine species. </p>
Population genomic analyses reveal hybridization and marked differences in genetic structure and demographic history of Scurria limpet sister species with parapatric distributions across the southeastern pacific
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