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Article

Tracing the Origin of Planktonic Protists in an Ancient Lake

1
Limnological Institute Siberian Branch of the Russian Academy of Sciences 3, Ulan-Batorskaya St., 664033 Irkutsk, Russia
2
Institute of Marine Sciences (ICM), CSIC, Passeig Marítim de la Barceloneta, 37-49, ES08003 Barcelona, Spain
3
Institute for the Oceans and Fisheries, University of British Columbia, 2202 Main Mall, Vancouver, BC V6T 1Z4, Canada
*
Authors to whom correspondence should be addressed.
Microorganisms 2020, 8(4), 543; https://doi.org/10.3390/microorganisms8040543
Received: 26 February 2020 / Revised: 5 April 2020 / Accepted: 7 April 2020 / Published: 9 April 2020
(This article belongs to the Special Issue Protist Molecular Ecology in Continental Systems)
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. View Full-Text
Keywords: microbial eukaryotes; phylogeography; marine-freshwater transitions; evolutionary radiation; species flocks; Lake Baikal; sympatry microbial eukaryotes; phylogeography; marine-freshwater transitions; evolutionary radiation; species flocks; Lake Baikal; sympatry
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MDPI and ACS Style

Annenkova, N.V.; Giner, C.R.; Logares, R. Tracing the Origin of Planktonic Protists in an Ancient Lake. Microorganisms 2020, 8, 543. https://doi.org/10.3390/microorganisms8040543

AMA Style

Annenkova NV, Giner CR, Logares R. Tracing the Origin of Planktonic Protists in an Ancient Lake. Microorganisms. 2020; 8(4):543. https://doi.org/10.3390/microorganisms8040543

Chicago/Turabian Style

Annenkova, Nataliia V., Caterina R. Giner, and Ramiro Logares. 2020. "Tracing the Origin of Planktonic Protists in an Ancient Lake" Microorganisms 8, no. 4: 543. https://doi.org/10.3390/microorganisms8040543

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