Unexpected absence of island endemics: Long-distance dispersal in higher latitude sub-Antarctic Siphonaria (Gastropoda: Euthyneura) species

• Published in: Journal of Biogeography
• Main Authors: González Wevar, Claudio, Segovia, Nicolás I., Rosenfeld, Sebastián, Ojeda, Jaime, Hüne, Mathias, Naretto, Javier, Saucède, Thomas, Brickle, Paul, Morley, Simon, Féral, Jean Pierre, Spencer, Hamish G., Poulin, Elie
• Format: Article in Journal/Newspaper
• Language: English
• Published: Blackwell Publishing Ltd 2018
• Subjects: Antarctic circumpolar current; direct developers; long-distance dispersal; oceanic biogeography; pulmonate; rafting; Siphonaria; sub-Antarctic; Antarctic; Southern Ocean; Kerguelen; Antarc*
• Online Access: https://doi.org/10.1111/jbi.13174; https://repositorio.uchile.cl/handle/2250/155355

© 2018 John Wiley & Sons Ltd Aim: We assess biogeographical patterns, population structure and the range of species in the pulmonate genus Siphonaria across the sub-Antarctic. We hypothesized that locally endemic cryptic species will be found across the distribution of these direct-developing limpets in the sub-Antarctic. Location: The sub-Antarctic coasts of the Southern Ocean including South America, the Falkland/Malvinas, South Georgia, Kerguelen and Macquarie Islands. Methods: Multi-locus phylogenetic reconstructions, mtDNA time-calibrated divergence time estimations and population-based analyses of Siphonaria populations were used at the scale of the Southern Ocean. Results: We resolve two widely distributed lineages of Siphonaria (S. lateralis and S. fuegiensis) across the sub-Antarctic. MtDNA divergence time estimates suggest that they were separated around 4.0 Ma (3.0 to 8.0 Ma). Subsequently both species followed different evolutionary pathways across their distributions. Low