Extinction and recolonization of maritime Antarctica in the limpet Nacella concinna (Strebel, 1908) during the last glacial cycle: toward a model of Quaternary biogeography in shallow Antarctic invertebrates.

摘要: Quaternary glaciations in Antarctica drastically modified geographical ranges and population sizes of marine benthic invertebrates thus affected the amount distribution intraspecific genetic variation. Here, we present new information Antarctic limpet Nacella concinna, a dominant species along shallow ice-free rocky ecosystems. We examined patterns diversity structure this broadcast spawner maritime from peri-Antarctic island South Georgia. Genetic analyses showed that N. concinna represents single panmictic unit Antarctic. Low levels characterized population; its median-joining haplotype network revealed typical star-like topology with short genealogy broadly distributed. As previously reported nuclear markers, detected significant differentiation between Georgia Island populations. Higher diversity, more expanded presence private haplotypes support hypothesis glacial persistence island. Bayesian Skyline plot mismatch recognized an older demographic history Approximate computations did not during last period, but indicated resilience refugia (South Island). proposed model Biogeography for narrow bathymetric including (i) extinction populations periods; (ii) refugia; (iii) recolonization following deglaciation process.