Abstract
Seasonal patterns of di-nitrogen fluxes together with denitrification, anammox, and N-fixation rates were studied in sediment in an area subject to strong human pressure via waste water, tributaries and shellfish farming in the Mediterranean Sea (Carteau Cove, NW area of the Gulf of Lion). Ammonium concentration demonstrated no seasonal variation, however, a large increase in its concentration was observed over a 10 years period due to intense biodeposition of organic matter. In contrast, nitrate concentration demonstrated no seasonal or long-term (10 years) variation. The main processes affecting di-nitrogen flux magnitudes were denitrification and N-fixation. Anammox was only detected occasionally, nevertheless it represented at times up to 39% of the N2-flux. Nitrate reducing processes were variable and denitrification showed a 20-fold increase over the past 10 years and might actually have reached its potential maximal activity. Rates of N2 production (denitrification and anammox) were generally higher than those of N-fixation, leading to elimination of nitrogen from the ecosystem.
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Acknowledgments
We acknowledge the financial support by the CNRS-PNEC (Programme National PNEC chantier littoral atlantique). LM is partly supported by a French Ph.D. fellowship from the council of Provence Alpes Cotes d’Azur.
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Minjeaud, L., Michotey, V.D., Garcia, N. et al. Seasonal variation in di-nitrogen fluxes and associated processes (denitrification, anammox and nitrogen fixation) in sediment subject to shellfish farming influences. Aquat. Sci. 71, 425–435 (2009). https://doi.org/10.1007/s00027-009-0100-8
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DOI: https://doi.org/10.1007/s00027-009-0100-8