Morphology and Ecology of Two New Amoebae, Isolated from a Thalassohaline Lake, Dziani Dzaha

Type Article
Date 2020-12
Language English
Author(s) Aucher Willy1, Delafont Vincent1, Ponlaitiac Elodie1, Alafaci Aurélien1, Agogué Hélène2, Leboulanger Christophe3, Bouvy Marc3, Héchard Yann1
Affiliation(s) 1 : Laboratoire Ecologie et Biologie des Interactions (EBI), Equipe Microbiologie de l’Eau, Université de Poitiers, UMR CNRS 7267, Poitiers, France
2 : Littoral Environnement et Sociétés (LIENSs), UMR 7266 CNRS–La Rochelle Université, 2 rue Olympe des Gouges, 17 000 La Rochelle, France
3 : Unité MARBEC (Marine Biodiversity, Exploitation and Conservation), Université de Montpellier, IRD, Ifremer, CNRS; Place Eugène Bataillon, case 063, 34095, Montpellier cedex 5, France
Source Protist (1434-4610) (Elsevier BV), 2020-12 , Vol. 171 , N. 6 , P. 125770 (13p.)
DOI 10.1016/j.protis.2020.125770
WOS© Times Cited 6
Keyword(s) Arthrospira, grazing, halotolerant, Heterolobosea, thalassohaline, water

Dziani Dzaha is a hypersaline lake (Mayotte island), whose microbial community is dominated by photosynthetic microorganisms. Here, we describe two new free-living heteroloboseans. One belonging to the Pharyngomonas genus and the other, whose 18S rRNA gene sequence shares only 85% homology to its closest relatives Euplaesiobystra hypersalinica, was proposed as a new species of this genus being called Euplaesiobystra dzianiensis. Both strains were salt tolerant to 75‰ and grew between 25 and 37 °C. Their distribution patterns varied seasonally and depended also on depth. Noticeably, both free-living amoebae isolates were able to graze on Arthrospira filaments, which are found within the same water layer. In conclusion, we document for the first time the presence and ecology of free-living amoebae in the thalassohaline lake Dziani Dzaha, and describe a new species of the Euplaesiobystra genus.

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