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Antarctic Nemertea
Citation
Thornhill et al . 2008. Mol. Ecol. 17 (23), 5104-5117

Access data
Availability: Creative Commons License This dataset is licensed under a Creative Commons Attribution 4.0 International License.

Description
Data on Antactic Nemertea more

Open-ocean environments provide few obvious barriers to the dispersal of marine organisms. Major currents and/or environmental gradients potentially impede gene flow. One system hypothesized to form an open-ocean dispersal barrier is the Antarctic Polar Front, an area characterized by marked temperature change, deep water, and the high-flow Antarctic Circumpolar current. Despite these potential isolating factors, several invertebrate species occur in both regions, including the broadcast-spawning nemertean worm Parborlasia corrugatus. To empirically test for the presence of an open-ocean dispersal barrier, we sampled P. corrugatus and other nemerteans from southern South America, Antarctica, and the sub-Antarctic islands. Diversity was assessed by analyzing mitochondrial 16S rRNA and cytochrome c oxidase subunit I sequence data with Bayesian inference and TCS haplotype network analysis. Appropriate neutrality tests were also employed. Although our results indicate a single well-mixed lineage in Antarctica and the sub-Antarctic, no evidence for recent gene flow was detected between this population and South American P. corrugatus. Thus, even though P. corrugatus can disperse over large geographical distances, physical oceanographic barriers (i.e. Antarctic Polar Front and Antarctic Circumpolar Current) between continents have likely restricted dispersal over evolutionary time. Genetic distances and haplotype network analysis between South American and Antarctic/ sub-Antarctic P. corrugatus suggest that these two populations are possibly two cryptic species.

Scope
Keywords:
Marine, PS, Antarctica, Nemertea

Geographical coverage
PS, Antarctica [Marine Regions]

Temporal coverage
1 January 2008
Unknown

Taxonomic coverage
Nemertea [WoRMS]

Related datasets
Published in:
AntOBIS: Antarctic Ocean Biogeographic Information System, more

Publication
Based on this dataset:
Thornhill, D.J. et al. (2008). Open-ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus (Nemertea: Lineidae). Mol. Ecol. 17(23): 5104–5117. hdl.handle.net/10.1111/j.1365-294X.2008.03970.x, more

Dataset status: Completed
Data type: Data
Data origin: Literature research
Metadatarecord created: 2010-08-02
Information last updated: 2010-08-02
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