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>Bacterial biomass and productivity in sediments, stromatolites, and water of hamelin pool, shark bay, Western Australia
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Bacterial biomass and productivity in sediments, stromatolites, and water of hamelin pool, shark bay, Western Australia
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机译：Bacterial biomass and productivity in sediments, stromatolites, and water of hamelin pool, shark bay, Western Australia
Heterotrophic bacterial biomass and growth rates were examined in stromatolites formed from four different types of benthic cyanobacterial mats. Bacteria in algal mats were counted using direct microscopy and biomass was estimated from the numbers of bacteria. Heterotrophic bacterial growth rates were estimated from the rate of incorporation of tritiated thy#x2010;midine into DNA. Pustular mat, which occurs in the upper in#x2010;tertidal zone, contained relatively few bacteria in the surface layers (0#x2013;5 mm), having about 0.2 x 106cells mm#x2010;3, or 20 mgC m#x2010;2per millimetre depth. Other mats in the lower intertidal and subtidal zones had from 1 x 106cells mm#x2010;3to 8 x 106cells mm#x2010;3. Heterotrophic bacterial productivities were 2.1 to 5.0 mgC m#x2010;2h#x2010;1. Turnover times were an average of 1 day in the sandy sediment and 5 days in the colloform mat. Although these results are minimum estimates, they indicate that heterotrophic bacteria contribute substantially to the carbon cycle in stromatolites, by utilizing about 20 to 30 of primary production.
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