In situ conditions and interactions between microbes and minerals in fine-grained marine sediments: A TEM microfabric perspective

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In situ conditions and interactions between microbes and minerals in fine-grained marine sediments: A TEM microfabric perspective

机译：In situ conditions and interactions between microbes and minerals in fine-grained marine sediments: A TEM microfabric perspective

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Microbes, their exocellular secretions, and their impact on the mineralogy and microfabric of fine-grained continental margin sediments were investigated by transmission electron microscopy. Techniques were used that retained the in situ spatial relations of both bio-organic and mineralogical constituents. Photomicrographs were taken of characteristic mineral-microbe associations in the first meter of burial at conditions ranging from aerobic to anaerobic. Single-celled prokaryotes, prokaryotic colonies, and eukaryotic organisms were observed as were motile, sessile, and predatory species. Bacterial cells dominate the assemblage. The most commonly observed mineral-biological interaction was the surrounding, or close association, of isolated heterotrophic bacterial cells by clay minerals. Almost without exception, the external surfaces of the bacteria were covered with secreted exocellular slimes composed of cross-linked polysaccharide fibrils. These fibrils act to bind sediment grains into relatively robust microaggregates, roughly ≤ 25 μm in diameter. These exocellular polymers can significantly impact the interaction between microbes and minerals, as well as the chemical and physical transport of fluids and dissolved aqueous species through the sediment. Although pore water chemical profiles from the field sites studied have dissolved Fe and Mn, no close association was found between the microbes imaged and precipitated metal oxyhydroxides or other authigenic minerals, such as is commonly reported from laboratory cultures.

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《The American mineralogist》 |1999年第2期|183-192|共10页
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Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093-0220, U.S.A.;

Seaprobe Inc., 501 Pine Street, Picayune, Mississippi 39566, U.S.A.;

Department of Biology, University of New Orleans, New Orleans, Louisiana 70148, U.S.A.Resource Dynamics, 33 Orvieto Court, Florissant, Missouri 63031, U.S.A.Naval Research Laboratory, Stennis Space Center, Mississippi 39529, U.S.A.P.O. Box 580364, Houston, TX 77258, U.S.A.;

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In situ conditions and interactions between microbes and minerals in fine-grained marine sediments: A TEM microfabric perspective

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