Herbivory versus corallivory: Are parrotfish good or bad for Caribbean coral reefs?

Mumby, Peter J. (2009) Herbivory versus corallivory: Are parrotfish good or bad for Caribbean coral reefs?. Coral Reefs, 28 3: 683-690. doi:10.1007/s00338-009-0501-0


Author Mumby, Peter J.
Title Herbivory versus corallivory: Are parrotfish good or bad for Caribbean coral reefs?
Journal name Coral Reefs   Check publisher's open access policy
ISSN 0722-4028
1432-0975
Publication date 2009-09
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1007/s00338-009-0501-0
Volume 28
Issue 3
Start page 683
End page 690
Total pages 8
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract
With coral cover in decline on many Caribbean reefs, any process of coral mortality is of potential concern. While sparisomid parrotfishes are major grazers of Caribbean reefs and help control algal blooms, the fact that they also undertake corallivory has prompted some to question the rationale for their conservation. Here the weight of evidence for beneficial effects of parrotfishes, in terms of reducing algal cover and facilitating demographic processes in corals, and the deleterious effects of parrotfishes in terms of causing coral mortality and chronic stress, are reviewed. While elevated parrotfish density will likely increase the predation rate upon juvenile corals, the net effect appears to be positive in enhancing coral recruitment through removal of macroalgal competitors. Parrotfish corallivory can cause modest partial colony mortality in the most intensively grazed species of Montastraea but the generation and healing of bite scars appear to be in near equilibrium, even when coral cover is low. Whole colony mortality in adult corals can lead to complete exclusion of some delicate, lagoonal species of Porites from forereef environments but is only reported for one reef species (Porites astreoides), for one habitat (backreef), and with uncertain incidence (though likely <<10%). No deleterious effects of predation on coral growth or fecundity have been reported, though recovery of zooxanthellae after bleaching events may be retarded. The balance of evidence to date finds strong support for the herbivory role of parrotfishes in facilitating coral recruitment, growth, and fecundity. In contrast, no net deleterious effects of corallivory have been reported for reef corals. Corallivory is unlikely to constrain overall coral cover but contraints upon dwindling populations of the Montastraea annularis species complex are feasible and the role of parrotfishes as a vector of coral disease requires evaluation. However, any assertion that conservation practices should guard against protecting corallivorous parrotfishes appears to be unwarranted at this stage.
Keyword Conservation
Mortality
Coral
Herbivore
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Communicated by Biology Editor Dr. Philip Munday

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collection: School of Biological Sciences Publications
 
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Created: Tue, 23 Nov 2010, 14:35:48 EST