Spatial Patterns in Herbivory on a Coral Reef Are Influenced by Structural Complexity but Not by Algal Traits

Spatial patterns of macroalgal consumption on coral reefs are primarily influenced by structural complexity rather than algal traits. Research at Ningaloo Reef (Western Australia) found that herbivory rates were significantly higher in structurally complex, coral-dominated habitats, such as the outer reef and reef flat, where biomass of herbivorous fish was also elevated. Conversely, macroalgal consumption dropped to undetectable levels within 75 meters of these complex habitats, with algae thriving in simpler, lagoon environments. Unlike terrestrial systems, algal productivity or nutritional quality did not affect herbivory patterns, nor was there evidence of a positive feedback loop between nitrogen content and consumption. The study underscores the critical role of structural complexity in maintaining ecosystem functions and biodiversity on coral reefs.

Vergés, A., Vanderklift, M. A., Doropoulos, C., & Hyndes, G. A. (2011). Spatial Patterns in Herbivory on a Coral Reef Are Influenced by Structural Complexity but Not by Algal Traits. PLoS ONE, 6(2), e17115. https://doi.org/10.1371/journal.pone.0017115