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 eurybathic-which is surprising given that sea spiders lack a planktonic stage; the fertilised eggs and larvae remain attached...
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ftgriffithuniv:oai:research-repository.griffith.edu.au:10072/55663 2023-05-15T13:37:02+02:00 Genetic differentiation in the circum—Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae) P. Arango, Claudia Soler-Membrives, Anna J. Miller, Karen 2011 http://hdl.handle.net/10072/55663 https://doi.org/10.1016/j.dsr2.2010.05.019 English eng Elsevier Deep-Sea Research Part II: Topical Studies in Oceanography Biogeography and Phylogeography Journal article 2011 ftgriffithuniv https://doi.org/10.1016/j.dsr2.2010.05.019 2018-07-30T10:51:16Z 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 eurybathic-which 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 10-100 s of km (FST=0.07-0.22, 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. No Full Text Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Southern Ocean Weddell Sea Griffith University: Griffith Research Online Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea East Antarctica Weddell Hodgson ENVELOPE(166.083,166.083,-78.117,-78.117) Deep Sea Research Part II: Topical Studies in Oceanography 58 1-2 212 219 |
institution |
Open Polar |
collection |
Griffith University: Griffith Research Online |
op_collection_id |
ftgriffithuniv |
language |
English |
topic |
Biogeography and Phylogeography |
spellingShingle |
Biogeography and Phylogeography P. Arango, Claudia Soler-Membrives, Anna J. Miller, Karen Genetic differentiation in the circum—Antarctic sea spider Nymphon australe (Pycnogonida; Nymphonidae) |
topic_facet |
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 eurybathic-which 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 10-100 s of km (FST=0.07-0.22, 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. No Full Text |
format |
Article in Journal/Newspaper |
author |
P. Arango, Claudia Soler-Membrives, Anna J. Miller, Karen |
author_facet |
P. Arango, Claudia Soler-Membrives, Anna J. Miller, Karen |
author_sort |
P. Arango, Claudia |
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 |
Elsevier |
publishDate |
2011 |
url |
http://hdl.handle.net/10072/55663 https://doi.org/10.1016/j.dsr2.2010.05.019 |
long_lat |
ENVELOPE(166.083,166.083,-78.117,-78.117) |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea East Antarctica Weddell Hodgson |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea East Antarctica Weddell Hodgson |
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 |
Deep-Sea Research Part II: Topical Studies in Oceanography |
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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1766087241929588736 |