What drives the diversity of the most abundant terrestrial cercozoan family (rhogostomidae, cercozoa, rhizaria)?

Öztoprak, Hüsna (Institute of Zoology, Terrestrial Ecology, University of Cologne, Köln, Germany) ; Walden, Susanne (Institute of Zoology, Terrestrial Ecology, University of Cologne, Köln, Germany) ; Heger, Thierry (School of Viticulture and Enology, HES-SO // University of Applied Sciences Western Switzerland) ; Bonkowski, Michael (Institute of Zoology, Terrestrial Ecology, University of Cologne, Köln, Germany) ; Dumack, Kenneth (Institute of Zoology, Terrestrial Ecology, University of Cologne, Köln, Germany)

Environmental sequencing surveys of soils and freshwaters revealed high abundance and diversity of the Rhogostomidae, a group of omnivorous thecate amoebae. This is puzzling since only a few Rhogostomidae species have yet been described and only a handful of reports mention them in field surveys. We investigated the putative cryptic diversity of the Rhogostomidae by a critical re-evaluation of published environmental sequencing data and in-depth ecological and morphological trait analyses. The Rhogostomidae exhibit an amazing diversity of genetically distinct clades that occur in a variety of different environments. We further broadly sampled for Rhogostomidae species; based on these isolates, we describe eleven new species and highlight important morphological traits for species delimitation. The most important environmental drivers that shape the Rhogostomidae community were soil moisture, soil pH, and total plant biomass. The length/width ratio of the theca was a morphological trait related to the colonized habitats, but not the shape and size of the aperture that is often linked to moisture adaption in testate and thecate amoebae.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
Changins
Institute:
Aucun institut
Date:
2020-07
Pagination:
17 p.
Published in:
Microorganisms
Numeration (vol. no.):
2020, vol. 8, article no. 1123
DOI:
ISSN:
2076-2607
Appears in Collection:



 Record created 2020-08-11, last modified 2020-10-27

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