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...
Published in: | Invertebrate Systematics |
---|---|
Main Authors: | , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
country:AUS
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/11380/1120856 https://doi.org/10.1071/IS15045 |
id |
ftunivmodena:oai:iris.unimore.it:11380/1120856 |
---|---|
record_format |
openpolar |
spelling |
ftunivmodena:oai:iris.unimore.it:11380/1120856 2024-04-14T08:00:13+00:00 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 BERTOLANI, Roberto REBECCHI, Lorena GUIDETTI, Roberto McInnes, J. Sandra Cesari, Michele Mcinnes, J. Sandra Bertolani, Roberto Rebecchi, Lorena Guidetti, Roberto 2016 STAMPA http://hdl.handle.net/11380/1120856 https://doi.org/10.1071/IS15045 eng eng country:AUS info:eu-repo/semantics/altIdentifier/wos/WOS:000390319000007 volume:30 firstpage:635 lastpage:649 journal:INVERTEBRATE SYSTEMATICS http://hdl.handle.net/11380/1120856 doi:10.1071/IS15045 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85006324248 info:eu-repo/semantics/closedAccess info:eu-repo/semantics/article 2016 ftunivmodena https://doi.org/10.1071/IS15045 2024-03-21T17:41:34Z 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 Archivio della ricerca dell'Università di Modena e Reggio Emilia (Unimore: IRIS) Antarctic Dronning Maud Land Victoria Land Invertebrate Systematics 30 6 635 |
institution |
Open Polar |
collection |
Archivio della ricerca dell'Università di Modena e Reggio Emilia (Unimore: IRIS) |
op_collection_id |
ftunivmodena |
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. |
author2 |
Cesari, Michele Mcinnes, J. Sandra Bertolani, Roberto Rebecchi, Lorena Guidetti, Roberto |
format |
Article in Journal/Newspaper |
author |
CESARI, Michele BERTOLANI, Roberto REBECCHI, Lorena GUIDETTI, Roberto McInnes, J. Sandra |
spellingShingle |
CESARI, Michele BERTOLANI, Roberto REBECCHI, Lorena GUIDETTI, Roberto McInnes, J. Sandra 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 BERTOLANI, Roberto REBECCHI, Lorena GUIDETTI, Roberto McInnes, J. Sandra |
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 |
country:AUS |
publishDate |
2016 |
url |
http://hdl.handle.net/11380/1120856 https://doi.org/10.1071/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 |
info:eu-repo/semantics/altIdentifier/wos/WOS:000390319000007 volume:30 firstpage:635 lastpage:649 journal:INVERTEBRATE SYSTEMATICS http://hdl.handle.net/11380/1120856 doi:10.1071/IS15045 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85006324248 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1071/IS15045 |
container_title |
Invertebrate Systematics |
container_volume |
30 |
container_issue |
6 |
container_start_page |
635 |
_version_ |
1796317085013377024 |