Universität zu Köln

Schiwitza, Sabine ORCID: 0000-0002-9185-5236, Gutsche, Lennart, Freches, Eric, Arndt, Hartmut and Nitsche, Frank (2021). Extended divergence estimates and species descriptions of new craspedid choanoflagellates from the Atacama Desert, Northern Chile. Eur. J. Protistol., 79. MUNICH: ELSEVIER GMBH. ISSN 1618-0429

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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 Llamara, a hypersaline basin within the Central Depression of the Atacama Desert, reflects colonisation and divergence events which correspond to geological data of the paleohydrology. (C) 2021 Elsevier GmbH. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schiwitza, Sabine UNSPECIFIED orcid.org/0000-0002-9185-5236 UNSPECIFIED Gutsche, Lennart UNSPECIFIED UNSPECIFIED UNSPECIFIED Freches, Eric UNSPECIFIED UNSPECIFIED UNSPECIFIED Arndt, Hartmut UNSPECIFIED UNSPECIFIED UNSPECIFIED Nitsche, Frank UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-561424
DOI:	10.1016/j.ejop.2021.125798
Journal or Publication Title:	Eur. J. Protistol.
Volume:	79
Date:	2021
Publisher:	ELSEVIER GMBH
Place of Publication:	MUNICH
ISSN:	1618-0429
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DIVERSITY; RNA; PHYLOGENY; LAKE; SEDIMENTS; PROTISTS; NOVELTY; LLAMARA; MARINE; RECORD Multiple languages Microbiology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/56142