Tropical herbivores provide resilience to a climate-mediated phase shift on temperate reefs
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Climate-mediated changes to biotic interactions have the potential to fundamentally alter global ecosystems. However, the capacity for novel interactions to drive or maintain transitions in ecosystem states remains unresolved. We examined temperate reefs that recently underwent complete seaweed canopy loss and tested whether a concurrent increase in tropical herbivores could be maintaining the current canopy-free state. Turf-grazing herbivorous fishes increased in biomass and diversity, and displayed feeding rates comparable to global coral reefs. Canopy-browsing herbivores displayed high (~ 10 000 g 100 m<sup>-2</sup>) and stable biomass between 2006 and 2013. Tropical browsers had the highest abundance in 2013 and displayed feeding rates approximately three times higher than previously observed on coral reefs. These observations suggest that tropical herbivores are maintaining previously kelp-dominated temperate reefs in an alternate canopy-free state by grazing turfs and preventing kelp reestablishment. This remarkable ecosystem highlights the sensitivity of biotic interactions and ecosystem stability to warming and extreme disturbance events.
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Bennett, S.; Wernberg, T.; Harvey, Euan; Santana-Garcon, J.; Saunders, Ben (2015)Climate-mediated changes to biotic interactions have the potential to fundamentally alter global ecosystems. However, the capacity for novel interactions to drive or maintain transitions in ecosystem states remains ...
Herbivore abundance, site fidelity and grazing rates on temperate reefs inside and outside marine reservesFerguson, A.; Harvey, Euan; Knott, N. (2016)A key objective of marine reserves is to maintain ecological processes important to the functioning of marine ecosystems. Grazing by tropical herbivores contributes to maintaining resilient coral reefs and marine reserves ...
Temperate territorial damselfish act like tropical damselfish, but have no measurable effect on algae within their feeding areasSaunders, Ben; Kendrick, G.; Harvey, Euan (2015)Areas of high habitat heterogeneity support a high diversity of fauna in both terrestrial and aquatic systems. In altering the rate of consumption of benthic communities, tropical damselfish affect the rate and trajectory ...