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Ohan, J. ; Siani, R. ; Kurth, J. ; Sommer, V.* ; Gläser, K.* ; Karsten, U.* ; Schloter, M. ; Schulz, S.

Microbiome convergence and deterministic community assembly along successional biocrust gradients on potash salt heaps.

FEMS Microbiol. Ecol. 99:13 (2023)

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Open Access Green as soon as Postprint is submitted to ZB.

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Potash mining, typically performed for agricultural fertilizer production, can create piles of residual salt waste that are ecologically detrimental and difficult to revegetate. Biological soil crusts (biocrusts) have been found growing on and around these heaps, suggesting resilience to the hypersaline environment. We set out to understand the community dynamics of biocrust formation by examining two succesionary salinity gradients at historical mining sites using a high throughput amplicon sequencing. Bare heaps were distinct, with little overlap between sites, and were characterized by high salinity, low nutrient availability, and specialized, low diversity microbial communities, dominated by Halobacteria, Chloroflexia, and Deinococci. 'Initial' stages of biocrust development were dominated by site-specific Cyanobacteria, with significant overlap between sites. Established biocrusts were the most diverse, with large proportions of Alphaproteobacteria, Anaerolineae, and Planctomycetacia. Along the salinity gradient at both sites, salinity decreased, pH decreased, and nutrients and Chlorophyll a increased. Microbiomes between sites converged during succession and community assembly process analysis revealed biocrusts at both sites were dominated by deterministic, niche-based processes; indicating a high degree of phylogenetic turnover. We posit early cyanobacterial colonization is essential for biocrust initiation, and facilitates later establishment of plant and other higher-level biota.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords Cyanobacteria ; Bacterial Diversity ; Biocrust ; Metabarcoding ; Potash; Biological Soil Crusts; Desert; Diversity; Surface; Bacteria; Erosion; Genes

ISSN (print) / ISBN 0168-6496

e-ISSN 1574-6941

Journal FEMS Microbiology Ecology

Quellenangaben Volume: 99, Issue: 8, Article Number: 13

Publisher Wiley

Publishing Place Oxford

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Research Unit Comparative Microbiome Analysis (COMI)

Grants Gesellschaft fuer Chemische Technik und Biotechnologie e.V. (DECHEMA), Max-Buchner-Forschungsstipendium
Deutsche Bundesstiftung Umwelt (DBU)