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Marine Ecology Progress Series

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MEPS 634:225-229 (2020)  -  DOI:

Herbivory strength is similar or even greater in algal- compared to coral-dominated habitats on a recovering coral reef

Sarah Joy Bittick1,3,*, Caitlin R. Fong2, Rachel J. Clausing1, Jay D. Harvey1, Tarn M. Johnson1, Tomas A. Frymann1, Peggy Fong1

1Department of Ecology and Evolutionary Biology, University of California Los Angeles, 621 Young Drive South, Los Angeles, CA 90095-1606, USA
2Department of Ecology, Evolution, and Marine Biology, University of California Santa Barbara, 552 University Road, Santa Barbara, CA 93106-9620, USA
3Present address: Department of Biology, Loyola Marymount University, 1 LMU Drive, Los Angeles, CA 90045-2659, USA
*Corresponding author:

ABSTRACT: Coral reefs are increasingly shifting to algal dominance after disturbances. While herbivory that controls algal biomass may influence the stability of coral versus algal states, most reefs are overfished. Despite this, little is known about the contribution of smaller fishes to herbivory, especially in algal versus coral post-disturbance habitats, where differences in structural complexity may also influence herbivory. After coral loss driven by a predator outbreak in Mo’orea, French Polynesia, the benthic community comprised a mosaic patchwork of remnant coral, the brown macroalga Turbinaria ornata on the reef flat, and turf algae (<1 cm filaments) along the reef slope. We partitioned fish herbivory by size by deploying palatable macroalgae within cages with variable opening sizes in coral versus algal habitats on a reef flat and a reef slope. Herbivory was ~2× higher in Turbinaria habitats than coral habitats on the reef flat, while herbivory in turf and coral habitats on the slope were similar. The only measurable herbivory in coral habitats on the reef flat occurred in open treatments that allowed access by the biggest fishes, while smaller fishes were more important in Turbinaria habitats, evidenced by consumption of algae in cages with smaller openings. Equal or higher herbivory in algal habitats compared to coral may indicate an important feedback post-disturbance, and contribute to the rapid recovery of Mo’orean reefs.

KEY WORDS: Coral reef recovery · Herbivorous fish · Herbivory · Macroalgae · Phase shift

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Cite this article as: Bittick SJ, Fong CR, Clausing RJ, Harvey JD, Johnson TM, Frymann TA, Fong P (2020) Herbivory strength is similar or even greater in algal- compared to coral-dominated habitats on a recovering coral reef. Mar Ecol Prog Ser 634:225-229.

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