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Tracing the Origin of Planktonic Protists in an Ancient Lake

Ancient lakes are among the most interesting models for evolution studies because their biodiversity is the result of a complex combination of migration and speciation. Here, we investigate the origin of single celled planktonic eukaryotes from the oldest lake in the world—Lake Baikal (Russia). By u...

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Autores principales: Annenkova, Nataliia V., Giner, Caterina R., Logares, Ramiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7232311/
https://www.ncbi.nlm.nih.gov/pubmed/32283732
http://dx.doi.org/10.3390/microorganisms8040543
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author Annenkova, Nataliia V.
Giner, Caterina R.
Logares, Ramiro
author_facet Annenkova, Nataliia V.
Giner, Caterina R.
Logares, Ramiro
author_sort Annenkova, Nataliia V.
collection PubMed
description Ancient lakes are among the most interesting models for evolution studies because their biodiversity is the result of a complex combination of migration and speciation. Here, we investigate the origin of single celled planktonic eukaryotes from the oldest lake in the world—Lake Baikal (Russia). By using 18S rDNA metabarcoding, we recovered 1414 Operational Taxonomic Units (OTUs) belonging to protists populating surface waters (1–50 m) and representing pico/nano-sized cells. The recovered communities resembled other lacustrine freshwater assemblages found elsewhere, especially the taxonomically unclassified protists. However, our results suggest that a fraction of Baikal protists could belong to glacial relicts and have close relationships with marine/brackish species. Moreover, our results suggest that rapid radiation may have occurred among some protist taxa, partially mirroring what was already shown for multicellular organisms in Lake Baikal. We found 16% of the OTUs belonging to potential species flocks in Stramenopiles, Alveolata, Opisthokonta, Archaeplastida, Rhizaria, and Hacrobia. Putative flocks predominated in Chrysophytes, which are highly diverse in Lake Baikal. Also, the 18S rDNA of a number of species (7% of the total) differed >10% from other known sequences. These taxa as well as those belonging to the flocks may be endemic to Lake Baikal. Overall, our study points to novel diversity of planktonic protists in Lake Baikal, some of which may have emerged in situ after evolutionary diversification.
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spelling pubmed-72323112020-05-22 Tracing the Origin of Planktonic Protists in an Ancient Lake Annenkova, Nataliia V. Giner, Caterina R. Logares, Ramiro Microorganisms Article Ancient lakes are among the most interesting models for evolution studies because their biodiversity is the result of a complex combination of migration and speciation. Here, we investigate the origin of single celled planktonic eukaryotes from the oldest lake in the world—Lake Baikal (Russia). By using 18S rDNA metabarcoding, we recovered 1414 Operational Taxonomic Units (OTUs) belonging to protists populating surface waters (1–50 m) and representing pico/nano-sized cells. The recovered communities resembled other lacustrine freshwater assemblages found elsewhere, especially the taxonomically unclassified protists. However, our results suggest that a fraction of Baikal protists could belong to glacial relicts and have close relationships with marine/brackish species. Moreover, our results suggest that rapid radiation may have occurred among some protist taxa, partially mirroring what was already shown for multicellular organisms in Lake Baikal. We found 16% of the OTUs belonging to potential species flocks in Stramenopiles, Alveolata, Opisthokonta, Archaeplastida, Rhizaria, and Hacrobia. Putative flocks predominated in Chrysophytes, which are highly diverse in Lake Baikal. Also, the 18S rDNA of a number of species (7% of the total) differed >10% from other known sequences. These taxa as well as those belonging to the flocks may be endemic to Lake Baikal. Overall, our study points to novel diversity of planktonic protists in Lake Baikal, some of which may have emerged in situ after evolutionary diversification. MDPI 2020-04-09 /pmc/articles/PMC7232311/ /pubmed/32283732 http://dx.doi.org/10.3390/microorganisms8040543 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Annenkova, Nataliia V.
Giner, Caterina R.
Logares, Ramiro
Tracing the Origin of Planktonic Protists in an Ancient Lake
title Tracing the Origin of Planktonic Protists in an Ancient Lake
title_full Tracing the Origin of Planktonic Protists in an Ancient Lake
title_fullStr Tracing the Origin of Planktonic Protists in an Ancient Lake
title_full_unstemmed Tracing the Origin of Planktonic Protists in an Ancient Lake
title_short Tracing the Origin of Planktonic Protists in an Ancient Lake
title_sort tracing the origin of planktonic protists in an ancient lake
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7232311/
https://www.ncbi.nlm.nih.gov/pubmed/32283732
http://dx.doi.org/10.3390/microorganisms8040543
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