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Coral blocks were used as settlement surfaces to study the epili thc algal community (EAC) in the presence and short-term absence of large, herb~vorous grazers on the central Great Bamer Reef (GBR). Grazers were excluded by cages at study sites on 2 lnshore, 2 midshelf and 2 outershelf reef. Of 82 algal taxa recorded, 81 were small filamentous or fleshy 'algal turfs' Compos~ t~on a d abundance of algae differed greatly between caged and uncaged substrata, w ~ t h differences more pronounced on midand outershelf reefs than on lnshore reefs. Caged surfaces on lnshore reefs were dominated by Sphacelaria novae-hollandiae (Phaecophyta), an assemblage of Oscillatoriaceae (Cyanophyta), Acetabularia calyculus (Chlorophyta), Cerarniurn flaccidurn, Taeniorna nanum and Polysiphonia infestans (all Rhodophyta) and Cladophora fasiculans (Chlorophyta) Caged surfaces on m ~ d and outershelf reefs were dominated by Enterornorpha clathrata (Chlorophyta), P. ~nfestans, PolySiphonla sphaerocarpa, C. flaccidurn, Herposlphonla secunda f tenella and Lobophora variegata (all Rhodophyta), S. novaehollandae, assemblages of Osc~llatonaceae and Nostocaceae (Cyanophyta), Glfforda mitchellae and l Pseudopringsheimla (both Chlorophyta) These species are likely to account for a large proportion of algal product~on and food of large, herb~vorous grazers on these reefs. Uncaged surfaces on inshore reefs were dominated by S. novae-hollandiae, an assemblage of Oscillatonaceae, G. rnitchellae and P. sphaerocarpa; those on m d and outershelf reefs by the crustose coralhne alga Porolithon onkodes, assemblages of Nostocaceae and Oscillatoriaceae, ? Pseudopringsheirnia, Polysiphonia scopulorurn and Ceramluni punctiforrne. Locat~on on the continental shelf accounted for the major proportion of variability In the data due malnly to the dstribution of P onkodes. When thls species was om~tted from the analysis, the effect of excludng grazers In combination ul th differences between lnshore and mid-/outershelf reefs accounted for the major proportion of vanability. In the latter analysis, locatlon was a far less important component of var~ability In EAC omposit~on than was presence or absence of grazers, because of large between-reef (I.e. within-locahon) variance in the abundance of many species. Grazers have a greater lmpact on compos~tion and abundance of the EAC on midand outershelf reefs than on inshore reefs, in agreement with previous findings that herbivorous, grazing fishes are significantly less abundant on ~nshore than on midand outershelf reefs.

Effects of grazing on species composition of the epilithic algal community on coral reefs of the central Great Barrier Reef