Effects of Water Velocity on Respiration, Calcification, and Ammonium Uptake of a Porites compressa Community

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1994-07
Authors
Atkinson, M.J.
Kotler, E.
Newton, P.
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University of Hawaii Press
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Colonies of Porites compressa Dana were placed in a 10-m-long flume to form a community of coral. Ammonium uptake (N uptake) rate, respiration rate, and calcification rate were measured at different water velocities, ranging from 1 to 57 cm sec-1. N uptake was proportional to concentration from 20 to 0.15 uM N. The first-order rate constant for N uptake varied from 6.8 to 15.6 day-1, only an average of 2.1 times over a l0-fold change in water velocity. First-order rate constants for respiration were less than those for N uptake and ranged from 4.8 to 6.6 day-1. Respiration rate and calcification rate were not correlated with water velocity. The relative turnover of N compared with oxygen (O2) indicates that 94-98% of N flux must be retained within this coral community.
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Atkinson MJ, Kotler E, Newton P. 1994. Effects of water velocity on respiration, calcification, and ammonium uptake of a Porites compressa community. Pac Sci 48(3): 296-303.
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