Temporal variability and intensity of grazing: a mesocosm experiment.

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dc.contributor.author Costello, Mark en
dc.contributor.author Atalah, J en
dc.contributor.author Anderson, MJ en
dc.date.accessioned 2011-08-04T20:51:13Z en
dc.date.issued 2007 en
dc.identifier.citation MAR ECOL-PROG SER 341:15-24 2007 en
dc.identifier.issn 0171-8630 en
dc.identifier.uri http://hdl.handle.net/2292/7177 en
dc.description.abstract Grazing has long been recognised as a structuring force for plant assemblages. Most of this knowledge comes from experiments in which grazers have been excluded or their densities manipulated. However, the intensity of grazing can vary, in space and time. Recently, an increasing number of studies have stressed the importance of the variance around the mean of ecological processes, but the potential effects of temporal variability in grazing in marine systems have not yet been explored. We examined the separate effects of intensity and temporal variability of grazing by the gastropod Cantharidus purpureus (Gemelin, 1931) on algal assemblages in a mesocosm experiment. In replicated experiments, algal assemblages grown on artificial substrata were subject to grazing regimes with mean intensity and temporal variance as crossed factors. In the first experiment, the more variable regimes led to greater reductions in algal cover, regardless of the level of grazing intensity. In the second experiment, variability elicited a similar effect, but this effect was larger for the low-than for the high-intensity treatments. These results indicate that temporally variable grazing regimes may have greater effects on algal assemblages than those anticipated from changes in the mean intensity of grazing alone. Thus, we suggest that temporal variability is a potentially important aspect of grazing processes that should be examined and incorporated into predictive models. en
dc.language EN en
dc.publisher Inter-Research en
dc.relation.ispartofseries Marine Ecology-Progress Series en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0171-8630// en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Cantharidus purpureus en
dc.subject grazing frequency en
dc.subject percentage cover en
dc.subject macroalgal assemblages en
dc.subject MEAN INTENSITY en
dc.subject COMMUNITIES en
dc.subject VARIANCE en
dc.subject DISTURBANCE en
dc.subject GRAZERS en
dc.subject POOLS en
dc.subject ALGAE en
dc.subject SIZE en
dc.title Temporal variability and intensity of grazing: a mesocosm experiment. en
dc.type Journal Article en
dc.identifier.doi 10.3354/meps341015 en
pubs.begin-page 15 en
pubs.volume 341 en
dc.rights.holder Copyright: 2007 Inter-Research en
pubs.end-page 24 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 75815 en
pubs.org-id Science en
pubs.org-id School of Environment en
pubs.record-created-at-source-date 2010-09-01 en

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