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  • Changing microspatial patterns of sulfate-reducing microorganisms (SRM) during cycling of marine stromatolite mats.

Changing microspatial patterns of sulfate-reducing microorganisms (SRM) during cycling of marine stromatolite mats.

International journal of molecular sciences (2014-01-15)
Alexandru I Petrisor, Sandra Szyjka, Tomohiro Kawaguchi, Pieter T Visscher, Robert Sean Norman, Alan W Decho
RESUMO

Microspatial arrangements of sulfate-reducing microorganisms (SRM) in surface microbial mats (~1.5 mm) forming open marine stromatolites were investigated. Previous research revealed three different mat types associated with these stromatolites, each with a unique petrographic signature. Here we focused on comparing "non-lithifying" (Type-1) and "lithifying" (Type-2) mats. Our results revealed three major trends: (1) Molecular typing using the dsrA probe revealed a shift in the SRM community composition between Type-1 and Type-2 mats. Fluorescence in-situ hybridization (FISH) coupled to confocal scanning-laser microscopy (CSLM)-based image analyses, and 35SO4(2-)-silver foil patterns showed that SRM were present in surfaces of both mat types, but in significantly (p < 0.05) higher abundances in Type-2 mats. Over 85% of SRM cells in the top 0.5 mm of Type-2 mats were contained in a dense 130 µm thick horizontal layer comprised of clusters of varying sizes; (2) Microspatial mapping revealed that locations of SRM and CaCO3 precipitation were significantly correlated (p < 0.05); (3) Extracts from Type-2 mats contained acylhomoserine-lactones (C4- ,C6- ,oxo-C6,C7- ,C8- ,C10- ,C12- , C14-AHLs) involved in cell-cell communication. Similar AHLs were produced by SRM mat-isolates. These trends suggest that development of a microspatially-organized SRM community is closely-associated with the hallmark transition of stromatolite surface mats from a non-lithifying to a lithifying state.

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Silver, foil, light tested, 50x50mm, thickness 0.05mm, annealed, 99.95+%
Silver, foil, 100x100mm, thickness 0.5mm, as rolled, 99.99+%
Silver, foil, 10mm disks, thickness 1.0mm, as rolled, 99.95+%
Silver, foil, 25x25mm, thickness 1.0mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.005mm, 99.97%
Silver, foil, 15mm disks, thickness 0.006mm, 99.97%
Silver, foil, 15mm disks, thickness 0.007mm, 99.97%
Silver, foil, 15mm disks, thickness 0.008mm, 99.95+%
Silver, foil, 15mm disks, thickness 0.008mm, 99.97%
Silver, foil, 15mm disks, thickness 0.009mm, 99.97%
Silver, foil, 15mm disks, thickness 0.0125mm, 99.95+%
Silver, foil, 15mm disks, thickness 0.015mm, 99.97%
Silver, foil, 15mm disks, thickness 0.01mm, 99.95+%
Silver, foil, 15mm disks, thickness 0.025mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.025mm, as rolled, 99.99+%
Silver, foil, 15mm disks, thickness 0.02mm, 99.97%
Silver, foil, 15mm disks, thickness 0.035mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.05mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.075mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.125mm, annealed, 99.95+%
Silver, foil, 15mm disks, thickness 0.125mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.125mm, as rolled, 99.99+%
Silver, foil, 15mm disks, thickness 0.15mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.1mm, annealed, 99.95+%
Silver, foil, 15mm disks, thickness 0.1mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.20mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.25mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.25mm, as rolled, 99.99+%
Silver, foil, 15mm disks, thickness 0.5mm, as rolled, 99.95+%
Silver, foil, 15mm disks, thickness 0.5mm, as rolled, 99.99+%

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