Self-maintaining or continuously refreshed? The genetic structure of Euphausia lucens populations in the Benguela upwelling ecosystem

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dc.contributor.authorHarkins, Gordon William
dc.contributor.authorD'Amato, Maria Eugenia
dc.contributor.authorGibbons, Mark J.
dc.date.accessioned2017-10-19T08:57:02Z
dc.date.available2017-10-19T08:57:02Z
dc.date.issued2013
dc.description.abstractPopulations of Euphausia lucens over the shelf of the southern Benguela upwelling region could be self-maintaining. Alternatively, they could be continually refreshed by expatriates from the SW Atlantic that enter the system via South Atlantic Central Water in the south, before developing and then being lost through advection off Namibia. These two hypotheses are investigated here by examining geographic heterogeneity and molecular variation (cox1 and ND1) of the species across its distributional range in the Southern Hemisphere. Comparisons are made with E. vallentini, which is assumed to show panmixia associated with its circumglobal distribution between 50 and 60°S. Phylogenetic analysis with mitochondrial 16S ribosomal RNA and cytochrome oxidase 1 (cox1) confirmed that E. lucens and E. vallentinirepresent sister taxa. Strong geographic structuring of cox1 and ND1 mtDNA genetic variation by ocean basin was recorded in E. lucens, indicating that neritic populations off South Africa are likely self-maintaining. This contrasts with the results for E. vallentini, which appears to occur as a single panmictic population across its distributional range. These differences are likely related to the habitats (neritic, E. lucens; oceanic, E. vallentini) occupied by each species. The results of the neutrality tests are consistent with demographic processes and suggest growth in E. lucens and equilibrium or shrinkage in E. vallentini. Although purifying selection cannot be ruled out in the former, the very few haplotypes recovered from E. vallentini could indicate that any population expansion following a crash is not yet reflected in the relatively slowly evolving mtDNA markers used here. Further work using other methods is recommended.en_US
dc.description.accreditationWeb of Science
dc.identifier.citationHarkins, G.W. et al. (2013). Self-maintaining or continuously refreshed? The genetic structure of Euphasia lucens populations in the Benguela upwelling ecosystem. Journal of Plankton Research, 35(5): 982 – 992en_US
dc.identifier.issn0142-7873
dc.identifier.urihttp://dx.doi.org/10.1093/plankt/fbt046
dc.identifier.urihttp://hdl.handle.net/10566/3241
dc.language.isoenen_US
dc.privacy.showsubmitterFALSE
dc.publisherOxford University Pressen_US
dc.rightsThis is the author-version of the article published online at: http://dx.doi.org/10.1093/plankt/fbt046
dc.status.ispeerreviewedTRUE
dc.subjectKrillen_US
dc.subjectConnectivityen_US
dc.subjectPhylogeographyen_US
dc.subjectSouthern hemisphereen_US
dc.subjectOceanicen_US
dc.subjectNeriticen_US
dc.subjectSpecies designationen_US
dc.titleSelf-maintaining or continuously refreshed? The genetic structure of Euphausia lucens populations in the Benguela upwelling ecosystemen_US
dc.typeArticleen_US

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Research Articles (Biodiversity and Conservation Biology)
Prof. Mark Gibbons