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Preliminary data are presented on benthic metabolism, i.e. carbon, oxygen and dissolved inorganic nitrogen (DIN) dynamics in a tropical, south-east Asian mangrove swamp. Primary production by benthic microalgae, measured as I4C assimilation and O2 produchon, was low compared to other intertidal areas. Benthic production comprised 4 to 20 "/o of production estimates obtained from the literature on the mangrove Rhizophora apiculata. Factors responsible for the relatively low benthic primary production appeared to be shading by R. apiculafa and DIN availability. Oxygen penetration into water-covered sediment showed significant differences between light (2.5 mm) and darkness (1.5 mm). In air-exposed sediment, however. O2 penetration depth was similar in both light and darkness. Oxygen uptake by the sediment obtained from core incubations was 20 to 55 O/ O higher than the rate estimated from vertical O2 profiles. The estimated O2 demand needed to support the decay of produced algal cells was ca 73 % of the measured total O2 uptake by the sediment. Water sampling in a tidal channel indicated that suspended particles transported by incoming tides were trapped in the mangrove system. This tidal import was evident as an upper se&mentary silt-zone (0 to 5 cm) superposing a lower peat containing root-zone (> 5 cm) in the sediment.

Preliminary assessment of benthic community metabolism in a south-east Asian mangrove swamp