Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species
Antarctica is an ice-dominated continent and all its terrestrial and freshwater habitats are fragmented, which leads to genetic divergence and, eventually, speciation. Acutuncus antarcticus is the most common Antarctic tardigrade and its cryptobiotic capabilities, small size and parthenogenetic repr...
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2016
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ftnerc:oai:nora.nerc.ac.uk:515840 2023-05-15T13:03:39+02:00 Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species Cesari, Michele McInnes, Sandra J. Bertolani, Roberto Rebecchi, Lorena Guidetti, Roberto 2016-12 text http://nora.nerc.ac.uk/id/eprint/515840/ https://nora.nerc.ac.uk/id/eprint/515840/1/Cesari_etal_2016_Acutuncus.pdf http://www.publish.csiro.au/IS/IS15045 en eng CSIRO Publishing https://nora.nerc.ac.uk/id/eprint/515840/1/Cesari_etal_2016_Acutuncus.pdf Cesari, Michele; McInnes, Sandra J. orcid:0000-0003-3403-9379 Bertolani, Roberto; Rebecchi, Lorena; Guidetti, Roberto. 2016 Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species. Invertebrate Systematics, 30 (6). 635-649. https://doi.org/10.1071/IS15045 <https://doi.org/10.1071/IS15045> Publication - Article PeerReviewed 2016 ftnerc https://doi.org/10.1071/IS15045 2023-02-04T19:44:17Z Antarctica is an ice-dominated continent and all its terrestrial and freshwater habitats are fragmented, which leads to genetic divergence and, eventually, speciation. Acutuncus antarcticus is the most common Antarctic tardigrade and its cryptobiotic capabilities, small size and parthenogenetic reproduction present a high potential for dispersal and colonisation. Morphological (light and electron microscopy, karyology) and molecular (18S rRNA and cytochrome c oxidase subunit I (COI) genes) analyses on seven populations of A. antarcticus elucidated the genetic diversity and distribution of this species. All analysed populations were morphologically indistinguishable and made up of diploid females. All specimens presented the same 18S rRNA sequence. In contrast, COI analysis showed higher variability, with most Victoria Land populations presenting up to five different haplotypes. Genetic distances between Victoria Land specimens and those found elsewhere in Antarctica were low, while distances between Dronning Maud Land and specimens from elsewhere were high. Our analyses show that A. antarcticus can still be considered a pan-Antarctic species, although the moderately high genetic diversity within Victoria Land indicates the potential for speciation events. Regions of Victoria Land are considered to have been possible refugia during the last glacial maximum and a current biodiversity hotspot, which the populations of A. antarcticus mirror with a higher diversity than in other regions of Antarctica. Article in Journal/Newspaper Acutuncus antarcticus Antarc* Antarctic Antarctica antarcticus Dronning Maud Land Victoria Land Tardigrade water bear Natural Environment Research Council: NERC Open Research Archive Antarctic Dronning Maud Land Victoria Land Invertebrate Systematics 30 6 635 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Antarctica is an ice-dominated continent and all its terrestrial and freshwater habitats are fragmented, which leads to genetic divergence and, eventually, speciation. Acutuncus antarcticus is the most common Antarctic tardigrade and its cryptobiotic capabilities, small size and parthenogenetic reproduction present a high potential for dispersal and colonisation. Morphological (light and electron microscopy, karyology) and molecular (18S rRNA and cytochrome c oxidase subunit I (COI) genes) analyses on seven populations of A. antarcticus elucidated the genetic diversity and distribution of this species. All analysed populations were morphologically indistinguishable and made up of diploid females. All specimens presented the same 18S rRNA sequence. In contrast, COI analysis showed higher variability, with most Victoria Land populations presenting up to five different haplotypes. Genetic distances between Victoria Land specimens and those found elsewhere in Antarctica were low, while distances between Dronning Maud Land and specimens from elsewhere were high. Our analyses show that A. antarcticus can still be considered a pan-Antarctic species, although the moderately high genetic diversity within Victoria Land indicates the potential for speciation events. Regions of Victoria Land are considered to have been possible refugia during the last glacial maximum and a current biodiversity hotspot, which the populations of A. antarcticus mirror with a higher diversity than in other regions of Antarctica. |
format |
Article in Journal/Newspaper |
author |
Cesari, Michele McInnes, Sandra J. Bertolani, Roberto Rebecchi, Lorena Guidetti, Roberto |
spellingShingle |
Cesari, Michele McInnes, Sandra J. Bertolani, Roberto Rebecchi, Lorena Guidetti, Roberto Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species |
author_facet |
Cesari, Michele McInnes, Sandra J. Bertolani, Roberto Rebecchi, Lorena Guidetti, Roberto |
author_sort |
Cesari, Michele |
title |
Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species |
title_short |
Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species |
title_full |
Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species |
title_fullStr |
Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species |
title_full_unstemmed |
Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species |
title_sort |
genetic diversity and biogeography of the south polar water bear acutuncus antarcticus (eutardigrada : hypsibiidae) - evidence that it is a truly pan-antarctic species |
publisher |
CSIRO Publishing |
publishDate |
2016 |
url |
http://nora.nerc.ac.uk/id/eprint/515840/ https://nora.nerc.ac.uk/id/eprint/515840/1/Cesari_etal_2016_Acutuncus.pdf http://www.publish.csiro.au/IS/IS15045 |
geographic |
Antarctic Dronning Maud Land Victoria Land |
geographic_facet |
Antarctic Dronning Maud Land Victoria Land |
genre |
Acutuncus antarcticus Antarc* Antarctic Antarctica antarcticus Dronning Maud Land Victoria Land Tardigrade water bear |
genre_facet |
Acutuncus antarcticus Antarc* Antarctic Antarctica antarcticus Dronning Maud Land Victoria Land Tardigrade water bear |
op_relation |
https://nora.nerc.ac.uk/id/eprint/515840/1/Cesari_etal_2016_Acutuncus.pdf Cesari, Michele; McInnes, Sandra J. orcid:0000-0003-3403-9379 Bertolani, Roberto; Rebecchi, Lorena; Guidetti, Roberto. 2016 Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) - evidence that it is a truly pan-Antarctic species. Invertebrate Systematics, 30 (6). 635-649. https://doi.org/10.1071/IS15045 <https://doi.org/10.1071/IS15045> |
op_doi |
https://doi.org/10.1071/IS15045 |
container_title |
Invertebrate Systematics |
container_volume |
30 |
container_issue |
6 |
container_start_page |
635 |
_version_ |
1766341461098364928 |