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Title: Temporal Variability of the Nutrient Environment on Davies Reef in the Central Great Barrier Reef, Australia 
Author: Ayukai, Tenshi
Date: 1993-04
Publisher: University of Hawaii Press
Citation: Ayukai T. 1993. Temporal variability of the nutrient environment on Davies Reef in the central Great Barrier Reef, Australia. Pac Sci 47(2): 171-179.
Abstract: Nutrient concentrations were measured at a fixed station in the
lagoon of Davies Reef, the central Great Barrier Reef, Australia, monthly
between January and December 1990. The day-to-day variation in nutrient
concentration inside and outside the lagoon was determined in May. The average
dissolved inorganic nitrogen (DIN) (sum of N03 , N02 , and NH4 ) concentration
for the pooled data in each of 11 monthly observations ranged between 0.34 and
1.84 uM. There was only a two-fold variation in average P04 concentration.
Average Si04 concentration showed a magnitude of variation similar to that of
DIN concentration. DIN concentration was significantly higher in the lagoon
than in the surrounding open water, suggesting that the significant DIN flux
results from internal sources. There were no clear inside-outside differences in
P04 and Si04 concentrations. N:P ratios in the lagoon were usually < 16: 1,
suggesting the possibility of N limitation. However, the ratios became> 16: 1
under low wind conditions, when the exchange of lagoon water was restricted
and the contribution of the internal DIN flux to the nutrient budget increased.
Si was usually available in excess of the growth requirement of diatoms
(Si: N > 1: 1), but occasional decreases in relative Si availability resulted in
occurrence of a high number of dinoflagellates.
ISSN: 0030-8870

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