Di-nitrogen fixation in a eutrophic tropical bay |
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Authors: | Laurence D. Mee Roberto Cortes-Altamirano Luz-Maria Garcia-de-la-Parra |
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Affiliation: | Estación de Investigaciones Mazatlán, Instituto de Ciencias del Mar y Limnología Universidad Nacional Autónoma de México, Apdo. Postal 811, Mazatlán, Sinaloa, México |
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Abstract: | Di-nitrogen fixation, measured in situ by the acetylene reduction technique, was shown to be associated with regular summer blooms of Oscillatoria erythraea in Mazatlán bay, a eutrophic tropical embayment on the Pacific Coast of Mexico. The Oscillatoria population density and the rate of di-nitrogen fixation per cell were of similar magnitude to those observed by other workers in the oligotrophic Caribbean Sea. Since the non-nitrogen limited fraction (Oscillatoria) of the total population was generally less than 10% and the nutrient supply to the bay is relatively abundant, di-nitrogen fixation does not appear to play an important role in the eutrophication of the bay. |
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Keywords: | nitrogen fixation phytoplankton tropical regions nutrients Mexico West Coast |
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