Open‐ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus(Nemertea: Lineidae)
Abstract 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 marke...
Published in: | Molecular Ecology |
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crwiley:10.1111/j.1365-294x.2008.03970.x 2024-09-15T17:45:57+00:00 Open‐ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus(Nemertea: Lineidae) THORNHILL, DANIEL J. MAHON, ANDREW R. NORENBURG, JON L. HALANYCH, KENNETH M. 2008 http://dx.doi.org/10.1111/j.1365-294x.2008.03970.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-294X.2008.03970.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-294X.2008.03970.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Molecular Ecology volume 17, issue 23, page 5104-5117 ISSN 0962-1083 1365-294X journal-article 2008 crwiley https://doi.org/10.1111/j.1365-294x.2008.03970.x 2024-08-13T04:17:18Z Abstract 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Wiley Online Library Molecular Ecology 17 23 5104 5117 |
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Wiley Online Library |
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English |
description |
Abstract 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. |
format |
Article in Journal/Newspaper |
author |
THORNHILL, DANIEL J. MAHON, ANDREW R. NORENBURG, JON L. HALANYCH, KENNETH M. |
spellingShingle |
THORNHILL, DANIEL J. MAHON, ANDREW R. NORENBURG, JON L. HALANYCH, KENNETH M. Open‐ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus(Nemertea: Lineidae) |
author_facet |
THORNHILL, DANIEL J. MAHON, ANDREW R. NORENBURG, JON L. HALANYCH, KENNETH M. |
author_sort |
THORNHILL, DANIEL J. |
title |
Open‐ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus(Nemertea: Lineidae) |
title_short |
Open‐ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus(Nemertea: Lineidae) |
title_full |
Open‐ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus(Nemertea: Lineidae) |
title_fullStr |
Open‐ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus(Nemertea: Lineidae) |
title_full_unstemmed |
Open‐ocean barriers to dispersal: a test case with the Antarctic Polar Front and the ribbon worm Parborlasia corrugatus(Nemertea: Lineidae) |
title_sort |
open‐ocean barriers to dispersal: a test case with the antarctic polar front and the ribbon worm parborlasia corrugatus(nemertea: lineidae) |
publisher |
Wiley |
publishDate |
2008 |
url |
http://dx.doi.org/10.1111/j.1365-294x.2008.03970.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-294X.2008.03970.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-294X.2008.03970.x |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Molecular Ecology volume 17, issue 23, page 5104-5117 ISSN 0962-1083 1365-294X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-294x.2008.03970.x |
container_title |
Molecular Ecology |
container_volume |
17 |
container_issue |
23 |
container_start_page |
5104 |
op_container_end_page |
5117 |
_version_ |
1810493883748974592 |