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Title: Effect of Ammonium Enrichment on Respiration, Zooxanthellar Densities, and Pigment Concentrations in Two Species of Hawaiian Corals 
Author: Stambler, Noga; Cox, Evelyn F; Vago, Razi
Date: 1994-07
Publisher: University of Hawaii Press
Citation: Stambler N, Cox EF, Vago R. 1994. Effect of ammonium enrichment on respiration, zooxanthellar densities, and pigment concentrations in two species of Hawaiian corals. Pac Sci 48(3): 284-290.
Abstract: Small branch tips or "nubbins" of two species of Hawaiian
corals, Pocillopora damicornis (Linnaeus) and Montipora verrucosa Vaughan,
were exposed to four ammonium concentrations, ammonium-stripped < 2
uM), ambient (~2 uM), and two enriched (20 uM and 50 uM) in microcosm
tanks. Nubbins represent replicates of a single coral colony. We examined the
effect of ammonium enrichment on zooxanthellar densities, pigment concentrations,
and respiration rates of the nubbins. Nubbins of both P. damicornis and
M. verrucosa showed a trend of increased pigment concentration with elevated
ammonium concentration. Pocillopora damicornis increased from 9.3 ug chlorophyll
a cm-2 in the ammonium-stripped treatment to 24.8 ug cm-2 in the
50-uM ammonium treatment. Similarly, M. verrucosa increased from 1.9 to
19.4 ug chlorophyll a cm-2. There were no significant differences in algal densities,
pigment concentrations per cell, pigment ratios, or respiration rates.
ISSN: 0030-8870
URI: http://hdl.handle.net/10125/2237

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