Changes in gametogenesis and fecundity of acroporid corals that were exposed to elevated nitrogen and phosphorus during the ENCORE experiment

Ward, Selena and Harrison, Peter L. (2000) Changes in gametogenesis and fecundity of acroporid corals that were exposed to elevated nitrogen and phosphorus during the ENCORE experiment. Journal of Experimental Marine Biology and Ecology, 246 2: 179-221. doi:10.1016/S0022-0981(99)00182-3


Author Ward, Selena
Harrison, Peter L.
Title Changes in gametogenesis and fecundity of acroporid corals that were exposed to elevated nitrogen and phosphorus during the ENCORE experiment
Journal name Journal of Experimental Marine Biology and Ecology   Check publisher's open access policy
ISSN 0022-0981
Publication date 2000-04-05
Sub-type Article (original research)
DOI 10.1016/S0022-0981(99)00182-3
Volume 246
Issue 2
Start page 179
End page 221
Total pages 43
Place of publication New York
Publisher Elsevier
Collection year 2000
Language eng
Subject C1
270400 Botany
780105 Biological sciences
Abstract Colonies of two scleractinian reef coral species, Acropora longicyathus and Acropora aspera were transplanted into patch reefs at One Tree Reef, Great Barrier Reef, Australia as part of the ENCORE experiment. These corals and colonies of A. aspera which were naturally present in the patch reefs were exposed to four treatments over two years: controls with normal seawater, elevated levels of nitrogen only, phosphorus only, or nitrogen plus phosphorus. These corals were sampled and used to determine whether gametogenic cycles and fecundity were affected by nutrient enrichment. Acropora longicyathus had a single annual gametogenic cycle. Corals exposed to elevated nitrogen produced significantly smaller and fewer eggs and contained less testes material than those which were not exposed to nitrogen. Exposure to elevated phosphorus only resulted in corals producing more but smaller eggs, and more testes material. Egg numbers of colonies from other treatments decreased as the gametogenic cycles continued, but those of the phosphorus colonies showed almost no reduction in egg numbers between the early and late stages of the gametogenic cycles. These results have important management implications for coral reefs as they demonstrate that small increases in concentrations of nitrogen and phosphorus can have severe effects on reproductive activity in these species of scleractinian corals.
Keyword Coral
Reproduction
Nutrients
ENCORE
Fecundity
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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Created: Tue, 10 Jun 2008, 13:09:56 EST