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A large-scale comparative study of 3 crown-of-thorns starflsh (COTS) impacted reefs and 3 non-impacted (control) reefs in the central reglon of the Great Barner Reef was undertaken. The principal objective was to investigate a long-term functional response of hcrbivorous fish to a potentially greater food rcsource in the form of increased abundances of turf algae on COTS affected reefs. Measurement of substratum cover and feeding ecology of Acanthurus njgrofuscus and Scarus frenatus was made on the windward reef slope of all reefs at a depth of 3 to 7 m. Significantly higher abundances of turf algae in con~parison with live coral cove! occurred on COTS nffected reefs, while the opposite pattern occurred on non-affected reefs. However, no obv~ous difference was detected in the overall dietary composition of A . n~grofuscus, variability being more apparent at a temporal scale. There was no difference in feeding rates of rovlng herbivores (2 specles) between impacted and control reefs. Furthermore, one component of the turf algal assemblage (thick turfs) showed increases in abundance in winter on affected reefs. while on non-affected reefs, thick turfs did not exhibit this seasonal pattern. A similar trend was observed for Cyanophyta (blue-green algae) in the dietary assemblage of A. nigrofuscus, although different sampling times and lack of detailed knowledge of epilithic algal community (EAC) composition made direct correlations difficult to infer Whether this increased turf algal resource is prompting a numerical or growth response from herbivorous fishes is curl-ently being investlgated.

marine ecology. progress series

Response of herbivorous fishes to crown-of-thorns starfish Acanthaster planci outbreaks. I. Substratum analysis and feeding ecology of Acanthurus nigrofuscus and Scarus frenatus