Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae)
Nymphon australe Hodgson 1902 is the most abundant species of sea spiders in the Southern Ocean. The species is recognised as highly morphologically variable, circumpolar and eurybathicwhich is surprising given that sea spiders lack a planktonic stage; the fertilised eggs and larvae remain attached...
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ftunivtasecite:oai:ecite.utas.edu.au:66143 2023-05-15T13:35:38+02:00 Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae) Arango, CP Soler-Membrives, A Miller, KJ 2011 application/pdf http://www.sciencedirect.com https://doi.org/10.1016/j.dsr2.2010.05.019 http://ecite.utas.edu.au/66143 en eng Pergamon-Elsevier Science Ltd http://ecite.utas.edu.au/66143/2/Miller_Deep-SeaResearch_2011.pdf http://dx.doi.org/10.1016/j.dsr2.2010.05.019 Arango, CP and Soler-Membrives, A and Miller, KJ, Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae), Deep Sea Research Part II: Topical Studies in Oceanography, 58, (1-2) pp. 212-219. ISSN 0967-0645 (2011) [Refereed Article] http://ecite.utas.edu.au/66143 Biological Sciences Evolutionary Biology Biogeography and Phylogeography Refereed Article PeerReviewed 2011 ftunivtasecite https://doi.org/10.1016/j.dsr2.2010.05.019 2019-12-13T21:35:14Z Nymphon australe Hodgson 1902 is the most abundant species of sea spiders in the Southern Ocean. The species is recognised as highly morphologically variable, circumpolar and eurybathicwhich is surprising given that sea spiders lack a planktonic stage; the fertilised eggs and larvae remain attached to the ovigers of the father, and consequently have limited dispersal capacity. In this study, we investigate the genetic structure of N. australe populations around Antarctica, confronting the apparent limited dispersal ability with its recognised circumpolarity. Here we analyse mitochondrial DNA of specimens from Antarctic Peninsula, Weddell Sea and East Antarctica to determine if they represent populations of the widespread N. australe or instead we can recognise cryptic species and how genetically different they are. Both CO1 and 16S sequence data produced single haplotype networks for N. australe from all three Antarctic locations without indication of cryptic speciation. However, we found strong phylogeographic structure among the three Antarctic locations based on CO1 data. There was only a single shared haplotype between the Antarctic Peninsula and the East Antarctica locations, and all three regions were significantly subdivided from each other (FST=0.28, p<0.01). Furthermore, within the Antarctic Peninsula and East Antarctic locations, we found evidence of genetic subdivision between populations of N. australe separated by 10100 s of km (FST=0.070.22, p<0.05), consistent with sea spiders life history traits indicating a limited dispersal capability. We conclude N. australe represents a single circum-Antarctic species that, despite its limited dispersal abilities, has successfully colonised large parts of the Antarctic marine ecosystem through geological history. However, clear genetic differences among and within locations indicate contemporary gene flow is limited, and that populations of N. australe around Antarctica are effectively isolated. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Southern Ocean Weddell Sea eCite UTAS (University of Tasmania) Antarctic Antarctic Peninsula East Antarctica Hodgson ENVELOPE(166.083,166.083,-78.117,-78.117) Southern Ocean The Antarctic Weddell Weddell Sea Deep Sea Research Part II: Topical Studies in Oceanography 58 1-2 212 219 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Evolutionary Biology Biogeography and Phylogeography |
spellingShingle |
Biological Sciences Evolutionary Biology Biogeography and Phylogeography Arango, CP Soler-Membrives, A Miller, KJ Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae) |
topic_facet |
Biological Sciences Evolutionary Biology Biogeography and Phylogeography |
description |
Nymphon australe Hodgson 1902 is the most abundant species of sea spiders in the Southern Ocean. The species is recognised as highly morphologically variable, circumpolar and eurybathicwhich is surprising given that sea spiders lack a planktonic stage; the fertilised eggs and larvae remain attached to the ovigers of the father, and consequently have limited dispersal capacity. In this study, we investigate the genetic structure of N. australe populations around Antarctica, confronting the apparent limited dispersal ability with its recognised circumpolarity. Here we analyse mitochondrial DNA of specimens from Antarctic Peninsula, Weddell Sea and East Antarctica to determine if they represent populations of the widespread N. australe or instead we can recognise cryptic species and how genetically different they are. Both CO1 and 16S sequence data produced single haplotype networks for N. australe from all three Antarctic locations without indication of cryptic speciation. However, we found strong phylogeographic structure among the three Antarctic locations based on CO1 data. There was only a single shared haplotype between the Antarctic Peninsula and the East Antarctica locations, and all three regions were significantly subdivided from each other (FST=0.28, p<0.01). Furthermore, within the Antarctic Peninsula and East Antarctic locations, we found evidence of genetic subdivision between populations of N. australe separated by 10100 s of km (FST=0.070.22, p<0.05), consistent with sea spiders life history traits indicating a limited dispersal capability. We conclude N. australe represents a single circum-Antarctic species that, despite its limited dispersal abilities, has successfully colonised large parts of the Antarctic marine ecosystem through geological history. However, clear genetic differences among and within locations indicate contemporary gene flow is limited, and that populations of N. australe around Antarctica are effectively isolated. |
format |
Article in Journal/Newspaper |
author |
Arango, CP Soler-Membrives, A Miller, KJ |
author_facet |
Arango, CP Soler-Membrives, A Miller, KJ |
author_sort |
Arango, CP |
title |
Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae) |
title_short |
Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae) |
title_full |
Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae) |
title_fullStr |
Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae) |
title_full_unstemmed |
Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae) |
title_sort |
genetic differentiation in the circum - antarctic sea spider nymphon australe (pycnogonida; nymphonidae) |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2011 |
url |
http://www.sciencedirect.com https://doi.org/10.1016/j.dsr2.2010.05.019 http://ecite.utas.edu.au/66143 |
long_lat |
ENVELOPE(166.083,166.083,-78.117,-78.117) |
geographic |
Antarctic Antarctic Peninsula East Antarctica Hodgson Southern Ocean The Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Antarctic Peninsula East Antarctica Hodgson Southern Ocean The Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Southern Ocean Weddell Sea |
op_relation |
http://ecite.utas.edu.au/66143/2/Miller_Deep-SeaResearch_2011.pdf http://dx.doi.org/10.1016/j.dsr2.2010.05.019 Arango, CP and Soler-Membrives, A and Miller, KJ, Genetic differentiation in the circum - Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae), Deep Sea Research Part II: Topical Studies in Oceanography, 58, (1-2) pp. 212-219. ISSN 0967-0645 (2011) [Refereed Article] http://ecite.utas.edu.au/66143 |
op_doi |
https://doi.org/10.1016/j.dsr2.2010.05.019 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
58 |
container_issue |
1-2 |
container_start_page |
212 |
op_container_end_page |
219 |
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1766068319980355584 |