Abstract
Measurements were made on primary production, oxygen consumption of substrate, and biomass of invertebrates and fish in a Mexican coastal lagoon. It was concluded that net production in the water column of 2.45 g C m −2 day −1 was sufficient to cover the metabolic requirements of the infauna in the wet season, and that production by macrophytes e.g. Ruppia maritima covered the increased input necessary for the epifauna, and for deposition in the substrate. Bacterial respiration was estimated as accounting for 61%, meio- and macrobenthos for 27% and inorganic uptake for 12% of substrate respiration on the lagoon flats. Large regional differences in oxygen uptake by the substrate were related to differences in organic detritus contents. Practical applications for the lagoon shrimp fishery are discussed.
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