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Title: Phosphate-uptake of experimental coral and algal communities under steady versus Oscillatory Flow 
Author: Bos, Melissa D.
Date: 2003-12
Publisher: University of Hawaii at Manoa
Abstract: Relationships between nutrient-uptake and net carbon production are variable on reefs. Nutrient-uptake appears to be governed by diffusion of nutrients through nutrient-depleted boundary layers near the surfaces of autotrophs. Nutrient-uptake may occur at different rates under steady and oscillatory flows because the boundary layers may be different. Rates of phosphate-uptake were measured for five experimental communities, two coral and three algal, for a total of 24 experiments. Uptake rate constants (S) ranged from 0.82 to 6.9 m day-1 over water velocities of 10 to 50 cm s -1. Uptake was proportional to water velocity and was close to mass-transfer limitation. Phosphate-loading rates, between 0.22 and 1.9 mmol m-2 day-1, were typical of natural loading. Excretion rates increased over time and ranged from 0 to 2.1 mmol m-2 day-1. S was not significantly different under steady versus oscillatory flow. The rate of phosphate-uptake may be enhanced by nitrogen-loading.
Description: viii, 51 leaves
Rights: All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.

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