Abstract
The relationship between water circulation rate and benthic community respiration was investigated using in situ chambers fitted with variable speed pumps. A strong, positive relationship was exhibited for three estuarine study sites which represented a broad spectrum of sediment characteristics. Both aerobic respiration (65–90% of the total sediment oxygen demand, SOD) and chemical oxygen demand, COD (10–35%) increased with stirring of the overlying waters at velocities up to 20 cm s-1. Contrary to the notion that COD accounts for any increase in SOD at velocities which initiate sediment resuspension, we observed that aerobic respiration was also stimulated by high velocities. We conclude that measurements of SOD in estuarine environments should be made using water circulation rates which attempt to mimic the natural environment, and that COD cannot be assumed unimportant and should be measured directly.
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Communicated by R. O. Fournier, Halifax
Supported by National Science Foundation Grant SMI 78-03130, Md. Dept. of Natural Resources, MPPSP P2-72-02 (B)
Contribution No. 1137, Center for Environmental and Estuarine Studies of the University of Maryland
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Boynton, W.R., Kemp, W.M., Osborne, C.G. et al. Influence of water circulation rate on in situ measurements of benthic community respiration. Mar. Biol. 65, 185–190 (1981). https://doi.org/10.1007/BF00397084
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DOI: https://doi.org/10.1007/BF00397084