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Marine Ecology Progress Series

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MEPS 450:55-65 (2012)  -  DOI:

Interactive effects of depth and marine protection on predation and herbivory patterns

Adriana Vergés1,2,*,**, Fiona Tomas3,**, Enric Ballesteros4

1Centre for Marine Bio-Innovation, Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, New South Wales 2052, Australia
2Sydney Institute of Marine Science, Mosman, New South Wales 2088, Australia
3Institut Mediterrani d’Estudis Avançats (CSIC), Carrer Miquel Marqués 21, 07190 Esporles, Illes Balears, Spain
4Centre d’Estudis Avançats de Blanes (CSIC), Accés a la Cala Sant Francesc 14, 17300 Blanes, Girona, Spain
**These authors contributed equally to this work

ABSTRACT: The establishment of marine protected areas (MPAs) worldwide has shown that closure of areas to fishing results in major changes in the structure of marine ecosystems. The removal of high-order consumers by fishing has both direct and indirect effects that can lead to important changes in the strength of trophic interactions. Although the effects of marine protection on biological interactions are beginning to be understood, our knowledge is largely restricted to shallow-water assemblages. However, depth gradients are also characterised by significant differences in the intensity of trophic linkages, and these may be interacting with any effects derived from protection. In this study, the individual and combined effects of depth and marine reserve protection on predation and herbivory were determined across 3 regions in the NW Mediterranean (Catalunya, Mallorca and Menorca) using juvenile urchins and palatable algae as bioassays. Marine protection did not strongly influence fish herbivory, which generally decreased with depth. We found no evidence of depth-related changes in predation rates or the size of predatory fishes, but there was a strong effect of protection on predation rates that was only consistently observed across regions in shallow water (5 m depth), but not at greater depths (15 and 30 m). This increase in predation of sea urchins within MPAs in shallow waters can have important community-wide consequences, as herbivorous sea urchins are commonly most abundant in these shallow habitats and predator−urchin interactions have important cascading effects on algal communities.

KEY WORDS: Marine reserves · Sea urchins · Macroalgae · Mediterranean Sea · Fish herbivory · Cystoseira spp.

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Cite this article as: Vergés A, Tomas F, Ballesteros E (2012) Interactive effects of depth and marine protection on predation and herbivory patterns. Mar Ecol Prog Ser 450:55-65.

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