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Species-specific effects of herbivorous fishes on the establishment of the macroalga Lobophora on coral reefs

Puk, LD, Cernohorsky, N, Marshell, A ORCID: 0000-0003-0841-9028, Dwyer, J, Wolfe, K and Mumby, PJ 2020 , 'Species-specific effects of herbivorous fishes on the establishment of the macroalga Lobophora on coral reefs' , Marine Ecology Progress Series, vol. 637 , pp. 1-14 , doi:

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Herbivory is a key ecosystem function that influences ecosystem trajectories. However, interactions between plants and herbivores are species-specific and change throughout the plants lifetime. On coral reefs, herbivorous fishes reduce competition between corals and macroalgae through their grazing activity, thereby regulating the ecosystem state. Grazing vulnerability of marine algae generally decreases with increasing algal size. Therefore, the removal of newly settled recruits by herbivorous fish is likely important in preventing macroalgal blooms and reducing competition with corals. We studied the grazing susceptibility of recruits of the brown macroalga Lobophora to multiple fish species through a combination of feeding observations and manipulative in situ and ex situ experiments. Further, we recorded short-term Lobophora growth patterns and adult survival over 9 wk. Lobophora recruits were more susceptible to herbivory than adults, likely owing to their smaller size. However, recruit mortality was driven by only 3 of the studied species: Acanthurus nigrofuscus, Scarus niger and Chlorurus spilurus, whereas other common herbivores did not remove any Lobophora recruits. Our data also suggest variable growth and recruitment among months. These findings point to a possible increase in grazing resistance with age for Lobophora. As such, a decrease in grazing pressure by key fish species controlling Lobophora recruits could permit Lobophora to establish more grazing-tolerant adult populations.

Item Type: Article
Authors/Creators:Puk, LD and Cernohorsky, N and Marshell, A and Dwyer, J and Wolfe, K and Mumby, PJ
Keywords: ontogeny, algae, herbivory, phase shift, seaweed, diversity, propagule
Journal or Publication Title: Marine Ecology Progress Series
Publisher: Inter-Research
ISSN: 0171-8630
DOI / ID Number:
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The authors 2020. Open Access under Creative Commons 4.0 International (CC BY 4.0) Attribution Licence ( Use, distribution and reproduction are unrestricted. Authors and original publication must be credited.

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