Spatial and Temporal Patterns of Benthic Respiration and Net Nutrient Fluxes in the Atchafalaya River Delta Estuary View Full Text


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Article Info

DATE

2015-11

AUTHORS

Brian J. Roberts, Susan M. Doty

ABSTRACT

Benthic respiration and nutrient flux rates were quantified during four distinct periods (spring peak in river discharge, summer period of offshore hypoxia, autumn period after breakdown of offshore hypoxia, and the non-hypoxic winter period) over an annual cycle in the Atchafalaya River Delta Estuary (ARDE). The overall mean benthic respiration rate for the ARDE was 12.9 mmol O2 m−2 day−1 with the highest and lowest rates occurring in summer and winter (22.1 and 5.4 mmol O2 m−2 day−1), respectively, and surprisingly little variance in relation to distance offshore of the deltas. Bottom water temperature explained 94 % of the variance in the natural log of benthic respiration. The mean annual fluxes for ammonium, dissolved organic nitrogen (DON), phosphate, and silicate were from the sediments to the water column (0.91, 0.44, 0.03, and 1.04 mmol m−2 day−1, respectively), but nitrate had a mean annual flux (−0.90 mmol N m−2 day−1) from the water column into the sediments. Net nitrate fluxes were greatest in summer, were generally higher at delta than at offshore sites, and were most strongly correlated with benthic respiration. Net NH4+ fluxes from the sediments to the overlying water column were greater at offshore sites than at delta sites resulting in the delta and offshore sites behaving as net dissolved inorganic nitrogen (DIN) sinks and sources, respectively. The results from this study suggest that benthic processes in the ARDE greatly alter bottom water oxygen availability as well as the size and form of nutrient fluxes exported to the northern Gulf of Mexico. More... »

PAGES

1918-1936

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