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Global patterns in the impact of marine herbivores on benthic primary producers


Poore, AGB and Campbell, AH and Coleman, RA and Edgar, GJ and Jormalainen, V and Reynolds, PL and Sotka, EE and Stachowicz, JJ and Taylor, RB and Vanderklift, MA and Duffy, JE, Global patterns in the impact of marine herbivores on benthic primary producers, Ecology Letters, 15, (8) pp. 912-922. ISSN 1461-0248 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 Blackwell Publishing Ltd/CNRS

DOI: doi:10.1111/j.1461-0248.2012.01804.x


Despite the importance of consumers in structuring communities, and the widespread assumption that consumption is strongest at low latitudes, empirical tests for global scale patterns in the magnitude of consumer impacts are limited. In marine systems, the long tradition of experimentally excluding herbivores in their natural environments allows consumer impacts to be quantified on global scales using consistent methodology. We present a quantitative synthesis of 613 marine herbivore exclusion experiments to test the influence of consumer traits, producer traits and the environment on the strength of herbivore impacts on benthic producers. Across the globe, marine herbivores profoundly reduced producer abundance (by 68% on average), with strongest effects in rocky intertidal habitats and the weakest effects on habitats dominated by vascular plants. Unexpectedly, we found little or no influence of latitude or mean annual water temperature. Instead, herbivore impacts differed most consistently among producer taxonomic and morphological groups. Our results show that grazing impacts on plant abundance are better predicted by producer traits than by large-scale variation in habitat or mean temperature, and that there is a previously unrecognised degree of phylogenetic conservatism in producer susceptibility to consumption.

Item Details

Item Type:Refereed Article
Keywords:coral reef, crustacean, grazing, herbivory, latitudinal gradient, macroalgae, marine, meta-analysis, mollusc,plant-animal interaction, primary production, rocky reef, sea urchin, seagrass
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Coastal or estuarine biodiversity
UTAS Author:Edgar, GJ (Professor Graham Edgar)
ID Code:82389
Year Published:2012
Web of Science® Times Cited:287
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2013-01-30
Last Modified:2013-05-22

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