Extended divergence estimates and species descriptions of new craspedid choanoflagellates from the Atacama Desert, Northern Chile

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Title:Main Title: Extended divergence estimates and species descriptions of new craspedid choanoflagellates from the Atacama Desert, Northern Chile
Description:Abstract: In contrast to previous perspectives, hypersaline environments have been proven to harbour a variety of potentially highly adapted microorganisms, in particular unicellular eukaryotes. The isolated, hypersaline waterbodies in the Atacama Desert, Northern Chile are exposed to high UV radiation and deposition of toxic heavy metals, making them of great interest regarding studies on speciation and evolutionary processes. In the past two years, among a variety of other protist species, five new species of heterotrophic choanoflagellates were described and analysed from this area, showing an adaptation to a broad range of salinities. Morphological data alone does not allow for species delineation within craspedid species, additional molecular data is essential for modern taxonomy. In addition, molecular clock analyses pointed towards a strong selection force of the extreme environmental conditions. Within this study, we describe three additional craspedid choanoflagellate species, isolated from different aquatic environments. Phylogenetic analyses show two distinct clades of choanoflagellates from the Atacama, suggesting two independent invasions of at least two ancestral marine species, and, as indicated by our new data, a possible dispersal by Andean aquifers. The extended molecular clock analysis based on transcriptomic data of choanoflagellate strains from the Salar de LlamarĂ¡, a hypersaline basin within the Central Depression of the Atacama Desert, reflects colonisation and divergence events which correspond to geological data of the paleohydrology.
Identifier:https://doi.org/10.1016/j.ejop.2021.125798 (DOI)
Responsible Party
Creators:Sabine Schiwitza (Author), Hartmut Arndt (Author), Frank Nitsche (Author)
Publication Year:2021
CRC1211 Topic:Biology
Related Subproject:B3
Subject:Keyword: Biodiversity
Geogr. Information Topic:Inland Waters
File Details
Data Type:Text - Article
File Size:1.3 MB
Date:Available: 31.08.2018
Mime Type:application/pdf
Data Format:PDF
Download Permission:Only Project Members
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Specific Information - Publication
Publication Status:Published
Review Status:Not peer reviewed
Publication Type:Article
Article Type:Journal
Source:European Journal of Protistology
Source Website:www.sciencedirect.com
Number of Pages:11 (1 - 11)
Metadata Details
Metadata Creator:Frank Nitsche
Metadata Created:19.07.2021
Metadata Last Updated:27.01.2022
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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