Closely related octopus species show different spatial genetic structures in response to the Antarctic seascape

Strugnell, Jan M., Allcock, A. Louise, and Watts, Phillip C. (2017) Closely related octopus species show different spatial genetic structures in response to the Antarctic seascape. Ecology and Evolution, 7 (19). pp. 8087-8099.

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Determining whether comparable processes drive genetic divergence among marine species is relevant to molecular ecologists and managers alike. Sympatric species with similar life histories might be expected to show comparable patterns of genetic differentiation and a consistent influence of environmental factors in shaping divergence. We used microsatellite loci to quantify genetic differentiation across the Scotia Arc in three species of closely related benthic octopods, Pareledone turqueti, P. charcoti, and Adelieledone polymorpha. The relative importance of environmental factors (latitude, longitude, depth, and temperature) in shaping genetic structure was investigated when significant spatial genetic structure was uncovered. Isolated populations of P. turqueti and A. polymorpha at these species' range margins were genetically different to samples close to mainland Antarctica; however, these species showed different genetic structures at a regional scale. Samples of P. turqueti from the Antarctic Peninsula, Elephant Island, and Signy Island were genetically different, and this divergence was associated primarily with sample collection depth. By contrast, weak or nonsignificant spatial genetic structure was evident across the Antarctic Peninsula, Elephant Island, and Signy Island region for A. polymorpha, and slight associations between population divergence and temperature or depth (and/or longitude) were detected. Pareledone charcoti has a limited geographic range, but exhibited no genetic differentiation between samples from a small region of the Scotia Arc (Elephant Island and the Antarctic Peninsula). Thus, closely related species with similar life history strategies can display contrasting patterns of genetic differentiation depending on spatial scale; moreover, depth may drive genetic divergence in Southern Ocean benthos.

Item ID: 51330
Item Type: Article (Research - C1)
ISSN: 2045-7758
Keywords: Antarctica, octopus, microsatellite, isolation by depth, Southern Ocean
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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Funders: Natural Environment Research Council (NERC), UK, Lloyd's Tercentenary Research Foundation (FTRF), CoSyst, Antarctic Science Bursary (ASB), Systematics Association, Edith Mary Pratt Musgrave Fund (EMPMF), Australia and Pacific Science Foundation, Thomas Davies Research Fund, Finish Academy (FA)
Projects and Grants: NERC AFI NE⁄C506321/1, LTRF Fellowship, FA grant 305532
Date Deposited: 25 Oct 2017 07:43
FoR Codes: 31 BIOLOGICAL SCIENCES > 3105 Genetics > 310599 Genetics not elsewhere classified @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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