Open-ocean barriers to dispersal: a test case with the Blackwell Publishing Ltd Antarctic Polar Front and the ribbon worm Parborlasia
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 tempera...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.421.2094 2023-05-15T13:49:23+02:00 Open-ocean barriers to dispersal: a test case with the Blackwell Publishing Ltd Antarctic Polar Front and the ribbon worm Parborlasia Daniel J. Thornhill Andrew R. Mahon Jon L. Norenburg Kenneth M. Halanych The Pennsylvania State University CiteSeerX Archives 2008 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.421.2094 http://gump.auburn.edu/halanych/lab/Pub.pdfs/ThornhillME2008c.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.421.2094 http://gump.auburn.edu/halanych/lab/Pub.pdfs/ThornhillME2008c.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://gump.auburn.edu/halanych/lab/Pub.pdfs/ThornhillME2008c.pdf 16S Antarctic Circumpolar Current Antarctic Polar Front Antarctica COI cryptic species text 2008 ftciteseerx 2016-01-08T04:02:26Z 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. Text Antarc* Antarctic Antarctica Unknown Antarctic The Antarctic |
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English |
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16S Antarctic Circumpolar Current Antarctic Polar Front Antarctica COI cryptic species |
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16S Antarctic Circumpolar Current Antarctic Polar Front Antarctica COI cryptic species Daniel J. Thornhill Andrew R. Mahon Jon L. Norenburg Kenneth M. Halanych Open-ocean barriers to dispersal: a test case with the Blackwell Publishing Ltd Antarctic Polar Front and the ribbon worm Parborlasia |
topic_facet |
16S Antarctic Circumpolar Current Antarctic Polar Front Antarctica COI cryptic species |
description |
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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Daniel J. Thornhill Andrew R. Mahon Jon L. Norenburg Kenneth M. Halanych |
author_facet |
Daniel J. Thornhill Andrew R. Mahon Jon L. Norenburg Kenneth M. Halanych |
author_sort |
Daniel J. Thornhill |
title |
Open-ocean barriers to dispersal: a test case with the Blackwell Publishing Ltd Antarctic Polar Front and the ribbon worm Parborlasia |
title_short |
Open-ocean barriers to dispersal: a test case with the Blackwell Publishing Ltd Antarctic Polar Front and the ribbon worm Parborlasia |
title_full |
Open-ocean barriers to dispersal: a test case with the Blackwell Publishing Ltd Antarctic Polar Front and the ribbon worm Parborlasia |
title_fullStr |
Open-ocean barriers to dispersal: a test case with the Blackwell Publishing Ltd Antarctic Polar Front and the ribbon worm Parborlasia |
title_full_unstemmed |
Open-ocean barriers to dispersal: a test case with the Blackwell Publishing Ltd Antarctic Polar Front and the ribbon worm Parborlasia |
title_sort |
open-ocean barriers to dispersal: a test case with the blackwell publishing ltd antarctic polar front and the ribbon worm parborlasia |
publishDate |
2008 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.421.2094 http://gump.auburn.edu/halanych/lab/Pub.pdfs/ThornhillME2008c.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
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Antarc* Antarctic Antarctica |
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Antarc* Antarctic Antarctica |
op_source |
http://gump.auburn.edu/halanych/lab/Pub.pdfs/ThornhillME2008c.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.421.2094 http://gump.auburn.edu/halanych/lab/Pub.pdfs/ThornhillME2008c.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766251277404078080 |