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- W98309074 abstract "The seagrass, Thalassia testudinum, is a highly productive marine plant which grows in shallow waters of the tropical and sub-tropical Atlantic Ocean. Its production in these nutrient poor environments is regulated by availability of nitrogen. Studies of N2(C2H2) fixation associated with T. testudinum communities indicate that bacterial activity in the rhizosphere contributes a substantial fraction of the plant's nitrogen requirement. In the phyllosphere, N2 fixation by heterocystous cyanobacteria may promote development of other leaf epiphytes. Nitrogenase activity is also associated with detrital leaves, and this provides another locus of nitrogen input to the seagrass community. Nitrogen fixation and denitrification (measured by C2H2 blockage/N2O production) occur simultaneously in anaerobic assays of rhizosphere sediments, but the latter process requires the addition of NO3-. The significance of the presence of denitrifying bacteria therefore depends on the rate of in situ NO3- production. Nitrification would be promoted both by the high levels of NH4+ in these sediments and by the O2 conveyed into the rhizosphere by the extensive rhizome system of T. testudinum. A comprehension of the interplay of bacterial activities and their relevance to the nitrogen cycle of this seagrass, particularly with respect to nitrification, requires further scrutiny." @default.
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- W98309074 date "1980-01-01" @default.
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- W98309074 title "MICROBIAL NITROGEN CYCLING IN A SEAGRASS COMMUNITY" @default.
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- W98309074 doi "https://doi.org/10.1016/b978-0-12-404060-1.50021-6" @default.
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