New insights in bacterial and eukaryotic diversity of microbial mats inhabiting exploited and abandoned salterns at the Ré Island (France)

Autor: Isabelle Lanneluc, Ingrid Fruitier-Arnaudin, Cristiana Cravo-Laureau, Sophie Sablé, Christine Cagnon, Camille Mazière, Christine Dupuy, Robert Duran, Hélène Agogué
Přispěvatelé: LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS), Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2021
Předmět:
Microbial diversity
Biodiversity
[SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics
Phylogenetics and taxonomy
Microbiology
03 medical and health sciences
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology
environment/Ecosystems
RNA
Ribosomal
16S
Environmental Microbiology
14. Life underwater
Microbial mat
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
Ecosystem
030304 developmental biology
2. Zero hunger
Islands
0303 health sciences
biology
Bacteria
030306 microbiology
Ecology
Eukaryota
15. Life on land
biology.organism_classification
16S ribosomal RNA
[SDV.MP.BAC]Life Sciences [q-bio]/Microbiology and Parasitology/Bacteriology
[SDE.ES]Environmental Sciences/Environmental and Society
France
[SDE.BE]Environmental Sciences/Biodiversity and Ecology
Archaea
[SDV.EE.IEO]Life Sciences [q-bio]/Ecology
environment/Symbiosis
Zdroj: Microbiological Research
Microbiological Research, Elsevier, 2021, 252, ⟨10.1016/j.micres.2021.126854⟩
ISSN: 1618-0623
0944-5013
Popis: International audience; In order to understand the effect of human practices on microbial mats organisation, the study aimed to investigate the biodiversity within microbial mats from exploited and abandoned salterns. Despite several attempts, archaeal 16S rRNA gene fragment sequences were not obtained, indicating that microbial mats were probably dominated by Bacteria with very low abundance of Archaea (< 1%). Thus, the study compared the bacterial and meiofaunal diversity of microbial mats from abandoned and exploited salterns. The higher salinity (101 ± 3.7 psu vs. 51.1 ± 0.7 psu; Welch t-test p < 0.05) of the exploited site maintained lower bacterial diversity in comparison to the abandoned site where the salinity gradient was no longer maintained. However, the microbial mats exhibited similar bacterial class composition while the eukaryotic diversity was significantly higher in the exploited saltern. The abandoned saltern was dominated by sulfate-reducing bacteria and Nematoda, while the exploited saltern was characterized by the presence of halophilic bacteria belonging to Marinobacter, Salinivibrio and Rhodohalobacter genera, and the larger abundance of Hypotrichia (ciliates). Such bacterial and eukaryotic diversity difference might be explained by human actions for salt recovery in exploited salterns such as scraping the surface of microbial mat and increasing salinity renewing the microbial mat each year. Such action decreases the bacterial diversity changing the food web structure that favour the presence of a larger diversity of eukaryotic organisms. Our study provides new insights on microbial mat communities inhabiting salterns, especially the consequences of abandoning saltern exploitation.
Databáze: OpenAIRE
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