Abstract
Of all benthic components on tropical reefs, algal turfs are the most widespread and the main source of primary productivity. We compared the importance of grazing by herbivores on algal turfs on two zones with marked differences in terms of benthic composition, herbivore biomass and grazing pressure, the inner flat and crest, of an inshore reef on the Great Barrier Reef, Australia. A combination of herbivore exclusion cages and transplants of coral rubble covered by algal turfs between reef zones was used to examine changes in algal turfs over a 4-day experimental period. In situ crest turfs had lower algal height, sediment loads and particulate content than reef flat turfs. Caged samples on the crest exhibited an increase in all three variables. In contrast, in situ and caged treatments on the flat presented algal turfs with similar values for the three analysed variables, with high algal height and heavy particulate and sediment loads. In the absence of cages, reef flat turfs transplanted to the crest had decreased algal height, total particulate material and particulate inorganic content, while the opposite was found in crest turf samples transplanted to the flat. Our results highlight the dynamic nature of algal turfs and the clear differences in the relative importance of herbivory in shaping turf length and sediment load between the reef crest and inner flat.
References
Airoldi L (1998) Roles of disturbance, sediment stress, and substratum retention on spatial dominance in algal turf. Ecology 79:2759–2770
Airoldi L (2003) The effects of sedimentation on rocky coast assemblages. Oceanogr Mar Biol Annu Rev 41:161–236
Airoldi L, Virgilio M (1998) Responses of turf-forming algae to spatial variations in the deposition of sediments. Mar Ecol Prog Ser 165:271–282
Babcock R, Davies P (1991) Effects of sedimentation on settlement of Acropora millepora. Coral Reefs 9:205–208
Bellwood DR, Fulton CJ (2008) Sediment-mediated suppression of herbivory on coral reefs: decreasing resilience to rising sea-levels and climate change? Limnol Oceanogr 53:2695–2701
Bellwood DR, Hughes TP, Folke C, Nyström M (2004) Confronting the coral reef crisis: supporting biodiversity, functional groups and resilience. Nature 429:827–833
Birrell C, McCook L, Willis B (2005) Effects of algal turfs and sediment on coral settlement. Mar Pollut Bull 51:408–414
Birrell C, McCook L, Willis B, Diaz-Pullido G (2008) Effects of benthic algae on the replenishment of corals and the implications for the resilience of coral reefs. Oceanogr Mar Biol 46:25–65
Bonaldo RM, Bellwood DR (2008) Size-dependent variation in the functional role of the parrotfish Scarus rivulatus on the Great Barrier Reef, Australia. Mar Ecol Prog Ser 360:237–244
Bonaldo RM, Bellwood DR (2009) Dynamics of parrotfish grazing scars. Mar Biol 156:771–777
Bonaldo RM, Bellwood DR (2010) Parrotfish predation on massive Porites on the Great Barrier Reef. Coral Reefs. doi:10.1007/s00338-010-0669-3
Carpenter RC (1993) Effects of algal canopy height and microscale substratum topography on profiles of flow speed in a coral forereef environment. Limnol Oceanogr 38:687–694
Ceccarelli DM, Jones GP, McCook LJ (2005) Foragers versus farmers: contrasting effects of two behavioural groups of herbivores on coral reefs. Oecologia 145:445–453
Choat JH (1991) The biology of herbivorous fishes on coral reefs. In: Sale PF (ed) The ecology of fishes on coral reefs. Academic Press, San Diego, pp 120–155
Crossman DJ, Choat JH, Clements KD (2001) Detritus as food for grazing fishes on coral reefs. Limnol Oceanogr 46:1596–1605
Diaz-Pulido G, McCook LJ, Dove S, Berkelmans R, Roff G, Kline DI, Weeks S, Evans RD, Williamson DH, Hoegh-Guldberg O (2009) Doom and bloom on a resilient reef: climate change, algal overgrowth and coral recovery. PLoS ONE 4:e5239
Done TJ (1982) Patterns in the distribution of coral communities across the Central Great Barrier Reef. Coral Reefs 1:95–107
Ferreira CEL, Gonçalves JEA (2006) Community structure and diet of roving herbivorous reef fishes in the Abrolhos Archipelago, south-western Atlantic. J Fish Biol 69:1533–1551
Fox RJ, Bellwood DR (2007) Quantifying herbivory across a coral reef depth gradient. Mar Ecol Prog Ser 339:49–59
Gardner TA, Cote IM, Gill JA, Grant A, Watkinson AR (2003) Long-term region-wide declines in Caribbean corals. Science 301:958–960
Gorgula SK, Connell SD (2004) Expansive covers of turf-forming algae on human-dominated coast: the relative effects of increasing nutrient and sediment loads. Mar Biol 145:613–619
Hatcher BG (1981) The interaction between grazing organisms and the epilithic algal community of a coral reef: a quantitative assessment. Proc 4th Int Coral Reef Symp 2:515–524
Hatcher BD, Larkum WD (1983) An experimental analysis of factors controlling the standing crop of the epilithic algal community on a coral reef. J Exp Mar Biol Ecol 69:61–84
Hay ME (1981) The functional morphology of turf forming seaweeds: persistence in stressful marine habitats. Ecology 62:739–750
Hay ME (1983) Spatial and temporal patterns in herbivory on a Caribbean fringing reef: the effects on plant distribution. Oecologia 58:299–308
Hay ME (1984a) Patterns of fish and urchin grazing on Caribbean coral reefs: are previous results typical? Ecology 65:446–454
Hay ME (1984b) Predictable spatial escapes from herbivory: how do these affect the evolution of herbivore resistance in tropical marine communities? Oecologia 64:396–407
Hoey AS, Bellwood DR (2008) Cross-shelf variation in the role of parrotfishes on the Great Barrier Reef. Coral Reefs 27:37–47
Hoey AS, Bellwood DR (2009) Limited functional redundancy in a high diversity system: single species dominates key ecological process on coral reefs. Ecosystems 12:1316–1328
Hughes TP, Baird AH, Bellwood DR, Card M, Connolly SR, Folke C, Grosberg R, Hoegh-Guldberg O, Jackson JBC, Kleypas J, Lough JM, Marshall P, Nyström M, Palumbi SR, Padolfi JM, Rosen B, Roughgarden J (2003) Climate change, human impacts, and the resilience of coral reefs. Science 301:929–933
Hughes TP, Rodrigues MJ, Bellwood DR, Ceccarelli D, Hoegh-Guldberg O, McCook L, Moltschaniwsky N, Pratchett MS, Steneck RS, Willis B (2007) Phase shifts, herbivory, and the resilience of coral reefs to climate change. Curr Biol 17:360–365
Ledlie MH, Graham NAJ, Bythell JC, Wilson SK, Jennings S, Polunin NVC, Hardcastle J (2007) Phase shifts and the role of herbivory in the resilience of coral reefs. Coral Reefs 26:641–653
Lewis SM, Wainwright PC (1985) Herbivore abundance and grazing intensity on a Caribbean coral reef. J Exp Mar Biol Ecol 87:215–228
Lirman D (2001) Competition between macroalgae and corals: effects of herbivore exclusion and increased algal biomass on coral survivorship and growth. Coral Reefs 19:392–399
McCook LJ (1997) Effects of herbivory on zonation of Sargassum spp. within fringing reefs of the central Great Barrier Reef. Mar Biol 129:713–722
McCook LJ (1999) Macroalgae and phase shifts on coral reefs of the Great Barrier Reef and other regions: a perspective on scientific issues and management consequences. Coral Reefs 18:357–367
Mumby PJ (2009) Phase shifts and the stability of macroalgal communities on Caribbean coral reefs. Coral Reefs 28:761–773
Norström AV, Nyström M, Lokrantz J, Folke C (2009) Alternative states on coral reefs: beyond coral-macroalgal phase shifts. Mar Ecol Prog Ser 376:295–306
Nugues MM, Roberts CM (2003) Coral mortality and interaction with algae in relation to sedimentation. Coral Reefs 22:507–516
Nyström M, Folke C (2001) Spatial resilience of coral reefs. Ecosystems 4:406–417
Nyström M, Graham NAJ, Lokrantz J, Norström A (2008) Capturing the cornerstones of coral reef resilience: linking theory to practice. Coral Reefs 27:795–809
Paddack MJ, Sponaugle S (2008) Recruitment and habitat selection of newly settled Sparisoma viride to low coral-cover reefs. Mar Ecol Prog Ser 369:205–212
Paddack MJ, Cowen RK, Sponaugle S (2006) Grazing pressure of herbivorous coral reef fishes on low-coral cover reefs. Coral Reefs 25:461–472
Paddack MJ, Reynolds JD, Aguilar C, Appeldoorn RS, Beets J, Burkett EW, Chittaro PM, Clarke K, Esteves R, Fonseca AC, Forrester GE, Friedlander AM, García-Sais J, González-Sansón G, Jordan LKB, McClellan DB, Miller MW, Molloy PP, Mumby PJ, Nagelkerken I, Nemeth M, Navas-Camacho R, Pitt J, Polunin NVC, Catalina Reyes-Nivia M, Robertson DR, Rodríguez Ramírez A, Salas E, Smith SR, Spieler RE, Steele MA, Williams ID, Wormald C, Watkinson AR, Côté IM (2009) Recent region-wide declines in Caribbean reef fish abundance. Curr Biol 19:590–595
Purcell SW (2000) Association of epilithic algae with sediment distribution on a windward reef in the northern Great Barrier Reef, Australia. Bull Mar Sci 66:199–214
Purcell SW, Bellwood DR (2001) Spatial patterns of epilithic algal and detrital resources on a windward coral reef. Coral Reefs 20:117–125
Russ GR (2003) Grazer biomass correlates more strongly with production than with biomass of algal turfs on a coral reef. Coral Reefs 22:63–67
Schroeter SC, Dixon JD, Kastendiek J, Smith RO (1993) Detecting the ecological effects of environmental impacts: a case study of kelp forest invertebrates. Ecol Appl 3:331–350
Scott FJ, Russ GR (1987) Effects of grazing on species composition of the epilithic algal community on coral reefs of the central Great Barrier Reef. Mar Ecol Prog Ser 39:293–304
Steele MA (1996) Effects of predators on the reefs: separating cage artifacts from the effects of predation. J Exp Mar Biol Ecol 198:249–267
Steneck RS (1988) Herbivory on coral reefs: a synthesis. Proc 6th Int Coral Reef Symp 1:37–49
Steneck RS (1997) Crustose corallines, other algal functional groups, herbivores and sediments: complex interactions along reef productivity gradients. Proc 8th Int Coral Reef Symp 1:695–700
Steneck RS, Macintyre IG, Reid RP (1997) A unique algal ridge system in the Exuma Cays, Bahamas. Coral Reefs 16:29–37
Stewart JG (1989) Establishment, persistence and dominance of Corallina (Rhodophyta) in algal turf. J Phycol 25:436–446
Thacker RW, Ginsburg DW, Paul VJ (2001) Effects of herbivore exclusion and sediment enrichment on coral reef macroalgae and cyanobacteria. Coral Reefs 19:318–329
Umar MJ, McCook LJ, Price IR (1998) Effects of sediment deposition on the seaweed Sargassum on a fringing coral reef. Coral Reefs 17:169–177
Williams LD, Polunin NVC (2001) Large-scale associations between macroalgal cover and grazer biomass on mid-depth reefs in the Caribbean. Coral Reefs 19:358–366
Wilson SK, Bellwood DR, Choat JH, Furnas MJ (2003) Detritus in the epilithic algal matrix and its use by coral reef fishes. Oceanogr Mar Biol Annu Rev 41:279–309
Wismer S, Hoey AS, Bellwood DR (2009) Cross-shelf benthic community structure on the Great Barrier Reef: relationships between macroalgal cover and herbivore biomass. Mar Ecol Prog Ser 376:45–54
Acknowledgments
We thank PR Guimarães-Júnior and C Syms for help with statistical analyses, JP Krajewski and C Lefevre for assistance in the field, J Tanner for comments on the manuscript, Orpheus Island Research Station staff for logistical support, colleagues in the ARC Centre of Excellence for helpful discussions, and the Australian Research Council Centre of Excellence for Coral Reef Studies and CAPES-Brazil for financial support.
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Bonaldo, R.M., Bellwood, D.R. Spatial variation in the effects of grazing on epilithic algal turfs on the Great Barrier Reef, Australia. Coral Reefs 30, 381–390 (2011). https://doi.org/10.1007/s00338-010-0704-4
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DOI: https://doi.org/10.1007/s00338-010-0704-4