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

Connectivity in the cold: the comparative population genetics of vent-endemic fauna in the Scotia Sea, Southern Ocean
Connectivity in the cold: the comparative population genetics of vent-endemic fauna in the Scotia Sea, Southern Ocean
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.
connectivity, Gigantopelta, hydrothermal vents, Kiwa, Lepetodrilus, Southern Ocean
0962-1083
1073-1088
Roterman, C.N.
7169c257-5fd7-4c20-87b5-ee38c72ea140
Copley, J.T.
5f30e2a6-76c1-4150-9a42-dcfb8f5788ef
Linse, K.T.
ac88a576-8c13-4c13-9d04-c06a65722462
Tyler, P.A.
b23b4558-2e46-4977-b2e4-9f4a4c2658ab
Rogers, A.D.
906fd860-72c9-4e72-ba43-36e78a1f4037
Roterman, C.N.
7169c257-5fd7-4c20-87b5-ee38c72ea140
Copley, J.T.
5f30e2a6-76c1-4150-9a42-dcfb8f5788ef
Linse, K.T.
ac88a576-8c13-4c13-9d04-c06a65722462
Tyler, P.A.
b23b4558-2e46-4977-b2e4-9f4a4c2658ab
Rogers, A.D.
906fd860-72c9-4e72-ba43-36e78a1f4037

Roterman, C.N., Copley, J.T., Linse, K.T., Tyler, P.A. and 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), pp. 1073-1088. (doi:10.1111/mec.13541).

Record type: Article

Abstract

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.

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More information

Accepted/In Press date: 24 December 2015
Published date: March 2016
Keywords: connectivity, Gigantopelta, hydrothermal vents, Kiwa, Lepetodrilus, Southern Ocean
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 391998
URI: http://eprints.soton.ac.uk/id/eprint/391998
ISSN: 0962-1083
PURE UUID: 9d913ee7-3ed1-47f4-9edf-6ee01248e4f3

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Date deposited: 12 Apr 2016 14:30
Last modified: 17 Jul 2017 19:21

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Contributors

Author: C.N. Roterman
Author: J.T. Copley
Author: K.T. Linse
Author: P.A. Tyler
Author: A.D. Rogers

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