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Genetic population structure in the Antarctic benthos: insights from the widespread amphipod, Orchomenella franklini

Citation

Baird, HP and Miller, KJ and Stark, JS, Genetic population structure in the Antarctic benthos: insights from the widespread amphipod, Orchomenella franklini, PloS One, 7, (3) Article e34363. ISSN 1932-6203 (2012) [Refereed Article]


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Licenced under Creative Commons Attribution 2.5 Generic (CC BY 2.5) http://creativecommons.org/licenses/by/2.5/

DOI: doi:10.1371/journal.pone.0034363

Abstract

Currently there is very limited understanding of genetic population structure in the Antarctic benthos. We conducted one of the first studies of microsatellite variation in an Antarctic benthic invertebrate, using the ubiquitous amphipod Orchomenella franklini (Walker, 1903). Seven microsatellite loci were used to assess genetic structure on three spatial scales: sites (100 s of metres), locations (1–10 kilometres) and regions (1000 s of kilometres) sampled in East Antarctica at Casey and Davis stations. Considerable genetic diversity was revealed, which varied between the two regions and also between polluted and unpolluted sites. Genetic differentiation among all populations was highly significant (FST = 0.086, RST = 0.139, p<0.001) consistent with the brooding mode of development in O. franklini. Hierarchical AMOVA revealed that the majority of the genetic subdivision occurred across the largest geographical scale, with Nem≈1 suggesting insufficient gene flow to prevent independent evolution of the two regions, i.e., Casey and Davis are effectively isolated. Isolation by distance was detected at smaller scales and indicates that gene flow in O. franklini occurs primarily through stepping-stone dispersal. Three of the microsatellite loci showed signs of selection, providing evidence that localised adaptation may occur within the Antarctic benthos. These results provide insights into processes of speciation in Antarctic brooders, and will help inform the design of spatial management initiatives recently endorsed for the Antarctic benthos.

Item Details

Item Type:Refereed Article
Keywords:ecological genetics, connectivity, Antarctica, invertebrate
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Baird, HP (Dr Helen Baird)
Author:Miller, KJ (Dr Karen Miller)
ID Code:80180
Year Published:2012
Web of Science® Times Cited:16
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2012-10-24
Last Modified:2013-05-07
Downloads:301 View Download Statistics

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