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- W180636147 abstract "Microbial mats were widespread during the first ca. 2 Ga. of our biosphere's history. To better understand microbial ecosystems and their biomarkers under the levels present in early oceans, we attempted a long-term (ca. 1 year) manipulation of in modem mats. Mats collected from salt ponds at Guerrero Negro, Baja Calif. Sur were incubated in a Greenhouse Collaboratory at Ames. Mats were maintained in artificial seawater brine containing either: 1) levels for these mats (70 mM), or 2) brine in which was replaced by chloride. Sulfate concentrations in the sulfate brine gradually approached their lowest (to date) value of 0. 1 mM as was consumed and/or diffused out of the mat over a period of ca. 4 months. During that period of time, a number of differences between the treatments emerged. Relative to the sulfate mats, sulfate mats had: 1) lower consumption of oxygen in the lower levels of the mat, 2) higher efficiencies of oxygenic photosynthesis, and 3) higher rates of nitrogen fixation. Rates of methane production by the mats increased greatly as concentrations fell below ca. 0.2 mM. In contrast, low and normal mats had similar net rates of exchange of O2 and dissolved inorganic C between the mats and overlying water. Reduced levels have diverse impacts upon these ecosystems." @default.
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- W180636147 date "2002-01-01" @default.
- W180636147 modified "2023-09-27" @default.
- W180636147 title "The Effects of Low Sulfate Concentrations on Modern Microbial Mat Communities: A Long Term Manipulation" @default.
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