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Factors controlling seasonal variability of benthic ammonium release and oxygen uptake in Alfacs Bay (Ebro Delta, NW Mediterranean)

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Abstract

The seasonal variability of sediment–water ammonium flux andoxygen uptake was studied in an estuarine bay (Alfacs Bay, Ebro Delta, NWMediterranean) influenced by temporal freshwater discharges. Three stationswith different organic loading were sampled. The relationships of benthicfluxes to bottom water (temperature, dissolved oxygen, ammonium, nitrateplus nitrite) and to sediment (porosity, chlorophyll a derivative pigments,organic carbon and nitrogen) variables were examined. Oxygen uptake rangedfrom 0.3 to 2.5 mmol m−2 h−1 and ammoniumrelease ranged from 6 to 230 µmol m−2 h−1.The lowest value was recorded at the station furthest from the freshwaterinputs, and the highest was at the littoral station nearest the freshwaterdischarge channels (for oxygen uptake) and at the deep station at the saltwedge front (for ammonium flux). Water temperature and the concentration ofchlorophyll a derivative pigments on the surface sediment were revealed asthe main variables to be taken into account to explain the variabilityfound. Changes in fluxes reflecting temperature changes were found at thestation furthest from the freshwater inputs, while at the other, fluxvariability was found to be related to the cycle of functioning offreshwater discharge channels. The different patterns of variability arediscussed in relation to the dynamics of the estuary and to the mainfeatures of benthic nitrogen cycling.

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Authors and Affiliations

  1. Departament d'Ecologia, Universitat de Barcelona, Avgda. Diagonal 645, E-08028, Barcelona, Spain

    Montserrat Vidal & Josep-Anton Morguí

  2. Institut de Ciències del Mar, Passeig Joan de Borbó s/n, E-08039, Barcelona, Spain

    Mikel Latasa, Javier Romero & Jordi Camp

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  1. Montserrat Vidal
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Vidal, M., Morguí, JA., Latasa, M. et al. Factors controlling seasonal variability of benthic ammonium release and oxygen uptake in Alfacs Bay (Ebro Delta, NW Mediterranean). Hydrobiologia 350, 169–178 (1997). https://doi.org/10.1023/A:1003096117678

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