Connectivity in the cold: the comparative population genetics of vent-endemic fauna in the Scotia Sea, Southern Ocean

Roterman, C.N.; Copley, J.T.; Linse, K.T. ORCID: https://orcid.org/0000-0003-3477-3047; Tyler, P.A.; Rogers, A.D.. 2016 Connectivity in the cold: the comparative population genetics of vent-endemic fauna in the Scotia Sea, Southern Ocean. Molecular Ecology, 25 (5). 1073-1088. https://doi.org/10.1111/mec.13541

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Text This article has been accepted for publication and will appear in a revised form in Molecular Ecology, published by Wiley. Copyright John Wiley & Sons Ltd. Roterman et al 2016 Mol Ecol accepted.docx - Accepted Version Download (7MB)

Abstract/Summary

We report the first comparative population genetics study for vent fauna in the Southern Ocean using cytochrome C oxidase I and microsatellite markers. Three species are examined: the kiwaid squat lobster, Kiwa tyleri, the peltospirid gastropod, Gigantopelta chessoia, and a lepetodrilid limpet, Lepetodrilus sp., collected from vent fields 440 km apart on the East Scotia Ridge (ESR) and from the Kemp Caldera on the South Sandwich Island Arc, ~95 km eastwards. We report no differentiation for all species across the ESR, consistent with panmixia or recent range expansions. A lack of differentiation is notable for Kiwa tyleri, which exhibits extremely abbreviated lecithotrophic larval development, suggestive of a very limited dispersal range. Larval lifespans may, however, be extended by low temperature-induced metabolic rate reduction in the Southern Ocean, muting the impact of dispersal strategy on patterns of population structure. COI diversity patterns suggest all species experienced demographic bottlenecks or selective sweeps in the past million years and possibly at different times. ESR and Kemp limpets are divergent, although with evidence of very recent ESR-Kemp immigration. Their divergence, possibility indicative of incipient speciation, along with the absence of the other two species at Kemp, may be the consequence of differing dispersal capabilities across a ~1000 m depth range and/or different selective regimes between the two areas. Estimates of historic and recent limpet gene flow between the ESR and Kemp are consistent with predominantly easterly currents and potentially therefore, cross-axis currents on the ESR, with biogeographic implications for the region.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1111/mec.13541
Programmes:	BAS Programmes > BAS Programmes 2015 > Biodiversity, Evolution and Adaptation
ISSN:	0962-1083
Additional Keywords:	connectivity, Gigantopelta, hydrothermal vents, Kiwa, Lepetodrilus, Southern Ocean
Date made live:	09 Mar 2016 09:14 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/509743

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