Postsealing genetic variation and population structure of two species of fur seal (Arctocephalus gazella and A. tropicalis).
International audience Commercial sealing in the 18th and 19th centuries had a major impact on the Antarctic and subantarctic fur seal populations ( Arctocephalus gazella and A. tropicalis ) in the Southern Ocean. The intensive and unrestricted nature of the industry ensured substantial reductions i...
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ftunivnantes:oai:HAL:hal-00193623v1 2023-05-15T13:37:48+02:00 Postsealing genetic variation and population structure of two species of fur seal (Arctocephalus gazella and A. tropicalis). Wynen, Louise P. Goldsworthy, Simon D. Guinet, Christophe Bester, Marthan N. Boyd, Ian L. Gjertz, Ian Hofmeyr, Greg J.G. White, Robert W.G. Sladek, Rob Antartic Wildlife Research Unit School of Zoology, University of Tasmania Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Department of Zoology and Entomology Pretoria University of Pretoria South Africa British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Norwegian Polar Institute Australian Genome Research Facility University of Queensland Brisbane Department of Zoology 2000 https://hal.science/hal-00193623 en eng HAL CCSD MAIK Nauka/Interperiodica hal-00193623 https://hal.science/hal-00193623 ISSN: 0026-8933 EISSN: 1608-3245 Molecular Biology https://hal.science/hal-00193623 Molecular Biology, 2000, 9, pp.299-314 Arctocephalus fur seal mtDNA population genetics subantarctic [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society info:eu-repo/semantics/article Journal articles 2000 ftunivnantes 2023-02-08T08:12:03Z International audience Commercial sealing in the 18th and 19th centuries had a major impact on the Antarctic and subantarctic fur seal populations ( Arctocephalus gazella and A. tropicalis ) in the Southern Ocean. The intensive and unrestricted nature of the industry ensured substantial reductions in population sizes and resulted in both species becoming locally extinct at some sites. However, both species are continuing to recover, through the recolonization of islands across their former range and increasing population size. This study investigated the extent and pattern of genetic variation in each species to examine the hypothesis that higher levels of historic sealing in A. gazella have resulted in a greater loss of genetic variability and population structure compared with A. tropicalis . A 316-bp section of the mitochondrial control region was sequenced and revealed nucleotide diversities of 3.2% and 4.8% for A. gazella and A. tropicalis , respectively. There was no geographical distribution of lineages observed within either species, although the respective F ST values of 0.074 and 0.19 were significantly greater than zero. These data indicate low levels of population structure in A. gazella and relatively high levels in A. tropicalis. Additional samples screened with restriction endonucleases were incorporated, and the distribution of restriction fragment length polymorphism (RFLP) and sequence haplotypes were examined to identify the main source populations of newly recolonized islands. For A. tropicalis , the data suggest that Macquarie Island and Iles Crozet were probably recolonized by females from Marion Island, and to a lesser extent Ile Amsterdam. Although there was less population structure within A. gazella , there were two geographical regions identified: a western region containing the populations of South Georgia and Bouvetøya, which were the probable sources for populations at Marion, the South Shetland and Heard Islands; and an eastern region containing the panmictic populations of Iles ... Article in Journal/Newspaper Antarc* Antarctic Arctocephalus gazella Bouvetøya Macquarie Island Marion Island Southern Ocean Université de Nantes: HAL-UNIV-NANTES Antarctic Southern Ocean The Antarctic Bouvetøya ENVELOPE(3.358,3.358,-54.422,-54.422) |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Arctocephalus fur seal mtDNA population genetics subantarctic [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society |
spellingShingle |
Arctocephalus fur seal mtDNA population genetics subantarctic [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society Wynen, Louise P. Goldsworthy, Simon D. Guinet, Christophe Bester, Marthan N. Boyd, Ian L. Gjertz, Ian Hofmeyr, Greg J.G. White, Robert W.G. Sladek, Rob Postsealing genetic variation and population structure of two species of fur seal (Arctocephalus gazella and A. tropicalis). |
topic_facet |
Arctocephalus fur seal mtDNA population genetics subantarctic [SDE.BE]Environmental Sciences/Biodiversity and Ecology [SDE.ES]Environmental Sciences/Environmental and Society |
description |
International audience Commercial sealing in the 18th and 19th centuries had a major impact on the Antarctic and subantarctic fur seal populations ( Arctocephalus gazella and A. tropicalis ) in the Southern Ocean. The intensive and unrestricted nature of the industry ensured substantial reductions in population sizes and resulted in both species becoming locally extinct at some sites. However, both species are continuing to recover, through the recolonization of islands across their former range and increasing population size. This study investigated the extent and pattern of genetic variation in each species to examine the hypothesis that higher levels of historic sealing in A. gazella have resulted in a greater loss of genetic variability and population structure compared with A. tropicalis . A 316-bp section of the mitochondrial control region was sequenced and revealed nucleotide diversities of 3.2% and 4.8% for A. gazella and A. tropicalis , respectively. There was no geographical distribution of lineages observed within either species, although the respective F ST values of 0.074 and 0.19 were significantly greater than zero. These data indicate low levels of population structure in A. gazella and relatively high levels in A. tropicalis. Additional samples screened with restriction endonucleases were incorporated, and the distribution of restriction fragment length polymorphism (RFLP) and sequence haplotypes were examined to identify the main source populations of newly recolonized islands. For A. tropicalis , the data suggest that Macquarie Island and Iles Crozet were probably recolonized by females from Marion Island, and to a lesser extent Ile Amsterdam. Although there was less population structure within A. gazella , there were two geographical regions identified: a western region containing the populations of South Georgia and Bouvetøya, which were the probable sources for populations at Marion, the South Shetland and Heard Islands; and an eastern region containing the panmictic populations of Iles ... |
author2 |
Antartic Wildlife Research Unit School of Zoology, University of Tasmania Centre d'Études Biologiques de Chizé (CEBC) Centre National de la Recherche Scientifique (CNRS) Department of Zoology and Entomology Pretoria University of Pretoria South Africa British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Norwegian Polar Institute Australian Genome Research Facility University of Queensland Brisbane Department of Zoology |
format |
Article in Journal/Newspaper |
author |
Wynen, Louise P. Goldsworthy, Simon D. Guinet, Christophe Bester, Marthan N. Boyd, Ian L. Gjertz, Ian Hofmeyr, Greg J.G. White, Robert W.G. Sladek, Rob |
author_facet |
Wynen, Louise P. Goldsworthy, Simon D. Guinet, Christophe Bester, Marthan N. Boyd, Ian L. Gjertz, Ian Hofmeyr, Greg J.G. White, Robert W.G. Sladek, Rob |
author_sort |
Wynen, Louise P. |
title |
Postsealing genetic variation and population structure of two species of fur seal (Arctocephalus gazella and A. tropicalis). |
title_short |
Postsealing genetic variation and population structure of two species of fur seal (Arctocephalus gazella and A. tropicalis). |
title_full |
Postsealing genetic variation and population structure of two species of fur seal (Arctocephalus gazella and A. tropicalis). |
title_fullStr |
Postsealing genetic variation and population structure of two species of fur seal (Arctocephalus gazella and A. tropicalis). |
title_full_unstemmed |
Postsealing genetic variation and population structure of two species of fur seal (Arctocephalus gazella and A. tropicalis). |
title_sort |
postsealing genetic variation and population structure of two species of fur seal (arctocephalus gazella and a. tropicalis). |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-00193623 |
long_lat |
ENVELOPE(3.358,3.358,-54.422,-54.422) |
geographic |
Antarctic Southern Ocean The Antarctic Bouvetøya |
geographic_facet |
Antarctic Southern Ocean The Antarctic Bouvetøya |
genre |
Antarc* Antarctic Arctocephalus gazella Bouvetøya Macquarie Island Marion Island Southern Ocean |
genre_facet |
Antarc* Antarctic Arctocephalus gazella Bouvetøya Macquarie Island Marion Island Southern Ocean |
op_source |
ISSN: 0026-8933 EISSN: 1608-3245 Molecular Biology https://hal.science/hal-00193623 Molecular Biology, 2000, 9, pp.299-314 |
op_relation |
hal-00193623 https://hal.science/hal-00193623 |
_version_ |
1766097801803988992 |