Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data
The origin of the Antarctic continental extant fauna is a highly debated topic, complicated by the paucity of organisms for which we have clear biogeographic distributions and understanding of their evolutionary timescale. To shed new light on this topic, we coupled molecular clock analyses with bio...
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ftnerc:oai:nora.nerc.ac.uk:517190 2023-05-15T13:49:34+02:00 Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data Guidetti, Robertos McInnes, Sandra J. Cesari, Michele Rebecchi, Lorena Rota-Stabelli, Omar 2017-06 text http://nora.nerc.ac.uk/id/eprint/517190/ https://nora.nerc.ac.uk/id/eprint/517190/1/document.pdf http://www.ctoz.nl/vol86/nr02/a01 en eng Naturalis Biodiversity Center https://nora.nerc.ac.uk/id/eprint/517190/1/document.pdf Guidetti, Robertos; McInnes, Sandra J. orcid:0000-0003-3403-9379 Cesari, Michele; Rebecchi, Lorena; Rota-Stabelli, Omar. 2017 Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data. Contributions to Zoology, 86 (2). 97-110. cc_by CC-BY Publication - Article PeerReviewed 2017 ftnerc 2023-02-04T19:45:02Z The origin of the Antarctic continental extant fauna is a highly debated topic, complicated by the paucity of organisms for which we have clear biogeographic distributions and understanding of their evolutionary timescale. To shed new light on this topic, we coupled molecular clock analyses with biogeographic studies on the heterotardigrade genus Mopsechiniscus. This taxon includes species with endemic distributions in Antarctica and other regions of the southern hemisphere. Molecular dating using different models and calibration priors retrieved similar divergence time for the split between the Antarctic and South American Mopsechiniscus lineages (32–48 Mya) and the estimated age of the Drake Passage opening that led to the separation of Antarctica and South America. Our divergence estimates are congruent with other independent studies in dating Gondwanan geological events. Although different analyses retrieved similar results for the internal relationships within the Heterotardigrada, our results indicated that the molecular dating of tardigrades using genes coding for ribosomal RNA (18S and 28S rDNA) is a complex task, revealed by a very wide range of posterior density and a relative difficulty in discriminating between competing models. Overall, our study indicates that Mopsechiniscus is an ancient genus with a clear Gondwanan distribution, in which speciation was probably directed by a co-occurrence of vicariance and glacial events. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Tardigrade Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Drake Passage |
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Natural Environment Research Council: NERC Open Research Archive |
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English |
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The origin of the Antarctic continental extant fauna is a highly debated topic, complicated by the paucity of organisms for which we have clear biogeographic distributions and understanding of their evolutionary timescale. To shed new light on this topic, we coupled molecular clock analyses with biogeographic studies on the heterotardigrade genus Mopsechiniscus. This taxon includes species with endemic distributions in Antarctica and other regions of the southern hemisphere. Molecular dating using different models and calibration priors retrieved similar divergence time for the split between the Antarctic and South American Mopsechiniscus lineages (32–48 Mya) and the estimated age of the Drake Passage opening that led to the separation of Antarctica and South America. Our divergence estimates are congruent with other independent studies in dating Gondwanan geological events. Although different analyses retrieved similar results for the internal relationships within the Heterotardigrada, our results indicated that the molecular dating of tardigrades using genes coding for ribosomal RNA (18S and 28S rDNA) is a complex task, revealed by a very wide range of posterior density and a relative difficulty in discriminating between competing models. Overall, our study indicates that Mopsechiniscus is an ancient genus with a clear Gondwanan distribution, in which speciation was probably directed by a co-occurrence of vicariance and glacial events. |
format |
Article in Journal/Newspaper |
author |
Guidetti, Robertos McInnes, Sandra J. Cesari, Michele Rebecchi, Lorena Rota-Stabelli, Omar |
spellingShingle |
Guidetti, Robertos McInnes, Sandra J. Cesari, Michele Rebecchi, Lorena Rota-Stabelli, Omar Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data |
author_facet |
Guidetti, Robertos McInnes, Sandra J. Cesari, Michele Rebecchi, Lorena Rota-Stabelli, Omar |
author_sort |
Guidetti, Robertos |
title |
Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data |
title_short |
Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data |
title_full |
Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data |
title_fullStr |
Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data |
title_full_unstemmed |
Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data |
title_sort |
evolutionary scenarios for the origin of an antarctic tardigrade species based on molecular clock analyses and biogeographic data |
publisher |
Naturalis Biodiversity Center |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/517190/ https://nora.nerc.ac.uk/id/eprint/517190/1/document.pdf http://www.ctoz.nl/vol86/nr02/a01 |
geographic |
Antarctic The Antarctic Drake Passage |
geographic_facet |
Antarctic The Antarctic Drake Passage |
genre |
Antarc* Antarctic Antarctica Drake Passage Tardigrade |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Tardigrade |
op_relation |
https://nora.nerc.ac.uk/id/eprint/517190/1/document.pdf Guidetti, Robertos; McInnes, Sandra J. orcid:0000-0003-3403-9379 Cesari, Michele; Rebecchi, Lorena; Rota-Stabelli, Omar. 2017 Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data. Contributions to Zoology, 86 (2). 97-110. |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
_version_ |
1766251663072428032 |