The ecology of coral reefs The ecology of coral reefs : results of a Workshop on Coral Reef Ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983 ecologyofcoralre00reak Year: 1985 c o c CD o c o O 8 12 Elapsed Time, hrs 16 Figure (A) NO3 depletion in lagoon sediments spiked to 20 yM NO3; (B) N2O production by lagoon sediments incubated with a 20 yM NO3 solution and in the presence of acetylene. Open circles = 0-5 cm depth; triangles = 10-15 cm depth; and closed circles = 20-25 cm depth. The concentrations of NO2 + NO3 in the sediments of the Thala

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The ecology of coral reefs The ecology of coral reefs : results of a Workshop on Coral Reef Ecology held by the American Society of Zoologists, Philadelphia, Pennsylvania, December 1983 ecologyofcoralre00reak Year: 1985 c o c CD o c o O 8 12 Elapsed Time, hrs 16 Figure (A) NO3 depletion in lagoon sediments spiked to 20 yM NO3; (B) N2O production by lagoon sediments incubated with a 20 yM NO3 solution and in the presence of acetylene. Open circles = 0-5 cm depth; triangles = 10-15 cm depth; and closed circles = 20-25 cm depth. The concentrations of NO2 + NO3 in the sediments of the Thalassia bed were higher than the overlying seawater ( yM NO2 + NO3), ranging from to 9 yM with a peak concentration at about 11 cm depth (fig. 2). When sediments were incubated in seawater enriched to a concentration of 20 yM NO3, NO3 concentrations decreased rapidly in sediments from all depths to below concentrations found in the pore waters (fig. 3A). Since this experiment 203

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