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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ftnaturalis:oai:naturalis:630170 2023-05-15T13:30:36+02:00 Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data Guidetti, R. McInnes, S.J. Cesari, M. Rebecchi, L. Rota-Stabelli, O. 2017 application/pdf http://www.repository.naturalis.nl/record/630170 http://www.repository.naturalis.nl/document/647983 unknown http://www.repository.naturalis.nl/record/630170 http://www.repository.naturalis.nl/document/647983 (c) Naturalis Contributions to Zoology (1383-4517) vol.86 (2017) nr.2 p.97 Gondwana historical biogeography Last Glacial Maximum molecular clock dating vicariance Article / Letter to the editor 2017 ftnaturalis 2022-09-01T06:15:07Z 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 Mopsechiniscus genus. 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 cooccurrence of vicariance and glacial events. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Tardigrade Naturalis Digital Academic Repository (National Museum of Natural History in the Netherlands) Antarctic Drake Passage The Antarctic |
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Open Polar |
collection |
Naturalis Digital Academic Repository (National Museum of Natural History in the Netherlands) |
op_collection_id |
ftnaturalis |
language |
unknown |
topic |
Gondwana historical biogeography Last Glacial Maximum molecular clock dating vicariance |
spellingShingle |
Gondwana historical biogeography Last Glacial Maximum molecular clock dating vicariance Guidetti, R. McInnes, S.J. Cesari, M. Rebecchi, L. Rota-Stabelli, O. Evolutionary scenarios for the origin of an Antarctic tardigrade species based on molecular clock analyses and biogeographic data |
topic_facet |
Gondwana historical biogeography Last Glacial Maximum molecular clock dating vicariance |
description |
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 Mopsechiniscus genus. 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 cooccurrence of vicariance and glacial events. |
format |
Article in Journal/Newspaper |
author |
Guidetti, R. McInnes, S.J. Cesari, M. Rebecchi, L. Rota-Stabelli, O. |
author_facet |
Guidetti, R. McInnes, S.J. Cesari, M. Rebecchi, L. Rota-Stabelli, O. |
author_sort |
Guidetti, R. |
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 |
publishDate |
2017 |
url |
http://www.repository.naturalis.nl/record/630170 http://www.repository.naturalis.nl/document/647983 |
geographic |
Antarctic Drake Passage The Antarctic |
geographic_facet |
Antarctic Drake Passage The Antarctic |
genre |
Antarc* Antarctic Antarctica Drake Passage Tardigrade |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Tardigrade |
op_source |
Contributions to Zoology (1383-4517) vol.86 (2017) nr.2 p.97 |
op_relation |
http://www.repository.naturalis.nl/record/630170 http://www.repository.naturalis.nl/document/647983 |
op_rights |
(c) Naturalis |
_version_ |
1766010558942806016 |