Nitrogen fixation within a tropical upwelling ecosystem: Evidence for a Redfield budget of carbon/nitrogen cycling by the total phytoplankton community | Zendy

Walsh John J. | Zendy

Open Access

Nitrogen fixation within a tropical upwelling ecosystem: Evidence for a Redfield budget of carbon/nitrogen cycling by the total phytoplankton community

Author(s) -

Walsh John J.

Publication year - 1996

Publication title -

journal of geophysical research: oceans

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.67

H-Index - 298

eISSN - 2156-2202

pISSN - 0148-0227

DOI - 10.1029/96jc01877

Subject(s) - upwelling , redfield ratio , phytoplankton , eutrophication , environmental science , oceanography , denitrification , ecosystem , nitrogen fixation , nitrogen , nitrate , new production , nitrogen cycle , nitrogen assimilation , environmental chemistry , nutrient , ecology , chemistry , geology , biology , organic chemistry

Recent measurements and paradigms suggest that (1) the uptake of dissolved carbon and nitrate by phytoplankton may be greater than the Redfield ratio of 6.6 and (2) the oceans may be loosing nitrogen from an imbalance in the global rates of nitrogen fixation and denitrification. An analysis of concurrent ΔDIC/ΔNO 3 depletion ratios within the Venezuelan and Peruvian upwelling ecosystems, indeed, suggests that values of 10.1–28.6 may pertain to these tropical eutrophic habitats. Nitrogen fixation may provide a Redfield balance in at least the former system, with 34–77% of the new production attributed to assimilation of N 2 . Independent confirmation of such new production on the Venezuelan shelf is provided by the interannual increases of H 2 S and DIC within the adjacent Cariaco Trench.

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