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Authors
Affiliations
1 Department of Biological and Environmental Sciences, University of Gothenburg, 405 30 Goteborg, SE
2 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, IN
Source
Current Science, Vol 106, No 6 (2014), Pagination: 867-870
Abstract
Phytoplankton are key components in primary production and their growth is determined mainly by the availability of nitrogen-nutrients in the ocean. The paradigm that phytoplankton prefer ammonium over nitrate when both substrates are present has been tested using 15N-labelled tracers on cultured diatoms and dinoflagellates isolated from two widespread geographical areas - the Baltic Sea and the Arabian Sea. We found contrary to the paradigm that both taxa preferred nitrate over ammonium and a significant within-species variation in N assimilation. Carbon uptake rates in the same experiments were estimated using 13C-labelled tracer.
Keywords
Carbon, Dinoflagellate, Diatom Species, Nitrogen, Stable Isotopes.
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