Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica
We examined the phylogeography of the endemic Antarctic collembolan Gomphiocephalus hodgsoni using allozymes and mitochondrial DNA (mtDNA; COI) to determine if potentially limited dispersal and long-term habitat fragmentation have promoted regional genetic differentiation. Allozyme analyses showed t...
Published in: | Molecular Ecology |
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Blackwell Publishing Ltd
2010
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Online Access: | https://hdl.handle.net/10289/4118 https://doi.org/10.1046/j.1365-294X.2003.01907.x |
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ftunivwaikato:oai:researchcommons.waikato.ac.nz:10289/4118 2023-11-12T04:03:44+01:00 Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica Stevens, Mark I. Hogg, Ian D. 2010 https://hdl.handle.net/10289/4118 https://doi.org/10.1046/j.1365-294X.2003.01907.x en eng Blackwell Publishing Ltd Molecular Ecology Stevens, M.I. & Hogg, I.D. (2010). Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica. Molecular Ecology, 12(9). 2357-2369. https://hdl.handle.net/10289/4118 doi:10.1046/j.1365-294X.2003.01907.x allozymes Collembola habitat fragmentation mitochondrial DNA phylogeography Journal Article 2010 ftunivwaikato https://doi.org/10.1046/j.1365-294X.2003.01907.x 2023-10-31T18:25:23Z We examined the phylogeography of the endemic Antarctic collembolan Gomphiocephalus hodgsoni using allozymes and mitochondrial DNA (mtDNA; COI) to determine if potentially limited dispersal and long-term habitat fragmentation have promoted regional genetic differentiation. Allozyme analyses showed that differentiation among 21 populations within the Ross Dependency was high (FST = 0.55) with two main groups each representing a distinct geographical region: (1) Ross Island and Beaufort Island; and (2) all continental sites. Ross Island populations showed low levels of differentiation (FST = 0.05) and no correlation with geographical distance, suggesting their derivation from a single glacial refuge. By contrast, continental regions revealed moderate levels of differentiation (FST = 0.27) and a strong correlation with geographical distance, indicating a much older history with several refugia likely. Two sympatric allozyme genotypes were found at three continental sites from Taylor Valley and were congruent with two mtDNA haplotypes, implying nonrandom breeding groups. Although haplotype sharing between one Ross Island site (Cape Bird) and one continental site (Granite Harbour) was identified, the clades showed mostly fragmented allopatric distributions. The extensive Pleistocene glaciations, in conjunction with limited dispersal opportunities, appear to have promoted isolation and divergence among the fragmented habitats. Furthermore, the McMurdo Sound appears to be an effective isolating barrier to dispersal. However, we suggest that the unaided dispersal capacity of G. hodgsoni is unlikely to account for the limited mixing of haplotypes across the McMurdo Sound and recent human- or bird-mediated dispersal is highly probable. Article in Journal/Newspaper Antarc* Antarctic Antarctica Beaufort Island Gomphiocephalus hodgsoni McMurdo Sound Ross Dependency Ross Island Victoria Land Springtail The University of Waikato: Research Commons Antarctic Beaufort Island ENVELOPE(166.833,166.833,-76.933,-76.933) Cape Bird ENVELOPE(-38.060,-38.060,-54.004,-54.004) Granite Harbour ENVELOPE(162.733,162.733,-76.883,-76.883) McMurdo Sound Ross Dependency ENVELOPE(160.000,160.000,-60.000,-60.000) Ross Island Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Victoria Land Molecular Ecology 12 9 2357 2369 |
institution |
Open Polar |
collection |
The University of Waikato: Research Commons |
op_collection_id |
ftunivwaikato |
language |
English |
topic |
allozymes Collembola habitat fragmentation mitochondrial DNA phylogeography |
spellingShingle |
allozymes Collembola habitat fragmentation mitochondrial DNA phylogeography Stevens, Mark I. Hogg, Ian D. Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica |
topic_facet |
allozymes Collembola habitat fragmentation mitochondrial DNA phylogeography |
description |
We examined the phylogeography of the endemic Antarctic collembolan Gomphiocephalus hodgsoni using allozymes and mitochondrial DNA (mtDNA; COI) to determine if potentially limited dispersal and long-term habitat fragmentation have promoted regional genetic differentiation. Allozyme analyses showed that differentiation among 21 populations within the Ross Dependency was high (FST = 0.55) with two main groups each representing a distinct geographical region: (1) Ross Island and Beaufort Island; and (2) all continental sites. Ross Island populations showed low levels of differentiation (FST = 0.05) and no correlation with geographical distance, suggesting their derivation from a single glacial refuge. By contrast, continental regions revealed moderate levels of differentiation (FST = 0.27) and a strong correlation with geographical distance, indicating a much older history with several refugia likely. Two sympatric allozyme genotypes were found at three continental sites from Taylor Valley and were congruent with two mtDNA haplotypes, implying nonrandom breeding groups. Although haplotype sharing between one Ross Island site (Cape Bird) and one continental site (Granite Harbour) was identified, the clades showed mostly fragmented allopatric distributions. The extensive Pleistocene glaciations, in conjunction with limited dispersal opportunities, appear to have promoted isolation and divergence among the fragmented habitats. Furthermore, the McMurdo Sound appears to be an effective isolating barrier to dispersal. However, we suggest that the unaided dispersal capacity of G. hodgsoni is unlikely to account for the limited mixing of haplotypes across the McMurdo Sound and recent human- or bird-mediated dispersal is highly probable. |
format |
Article in Journal/Newspaper |
author |
Stevens, Mark I. Hogg, Ian D. |
author_facet |
Stevens, Mark I. Hogg, Ian D. |
author_sort |
Stevens, Mark I. |
title |
Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica |
title_short |
Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica |
title_full |
Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica |
title_fullStr |
Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica |
title_full_unstemmed |
Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica |
title_sort |
long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail gomphiocephalus hodgsoni from victoria land, antarctica |
publisher |
Blackwell Publishing Ltd |
publishDate |
2010 |
url |
https://hdl.handle.net/10289/4118 https://doi.org/10.1046/j.1365-294X.2003.01907.x |
long_lat |
ENVELOPE(166.833,166.833,-76.933,-76.933) ENVELOPE(-38.060,-38.060,-54.004,-54.004) ENVELOPE(162.733,162.733,-76.883,-76.883) ENVELOPE(160.000,160.000,-60.000,-60.000) ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
Antarctic Beaufort Island Cape Bird Granite Harbour McMurdo Sound Ross Dependency Ross Island Taylor Valley Victoria Land |
geographic_facet |
Antarctic Beaufort Island Cape Bird Granite Harbour McMurdo Sound Ross Dependency Ross Island Taylor Valley Victoria Land |
genre |
Antarc* Antarctic Antarctica Beaufort Island Gomphiocephalus hodgsoni McMurdo Sound Ross Dependency Ross Island Victoria Land Springtail |
genre_facet |
Antarc* Antarctic Antarctica Beaufort Island Gomphiocephalus hodgsoni McMurdo Sound Ross Dependency Ross Island Victoria Land Springtail |
op_relation |
Molecular Ecology Stevens, M.I. & Hogg, I.D. (2010). Long-term isolation and recent range expansion from glacial refugia revealed for the endemic springtail Gomphiocephalus hodgsoni from Victoria Land, Antarctica. Molecular Ecology, 12(9). 2357-2369. https://hdl.handle.net/10289/4118 doi:10.1046/j.1365-294X.2003.01907.x |
op_doi |
https://doi.org/10.1046/j.1365-294X.2003.01907.x |
container_title |
Molecular Ecology |
container_volume |
12 |
container_issue |
9 |
container_start_page |
2357 |
op_container_end_page |
2369 |
_version_ |
1782338753381007360 |