Trophic cul-de-sac, Pyrazus ebeninus, limits trophic transfer through an estuarine detritus-based food web

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dc.contributor.author Bishop, Melanie en_US
dc.contributor.author Kelaher, Brendan en_US
dc.contributor.author Alquezar, Ralph en_US
dc.contributor.author York, Paul en_US
dc.contributor.author Ralph, Peter en_US
dc.contributor.author Skilbeck, Charles en_US
dc.date.accessioned 2009-12-21T02:29:31Z
dc.date.available 2009-12-21T02:29:31Z
dc.date.issued 2007 en_US
dc.identifier 2006006703 en_US
dc.identifier.citation Bishop Melanie et al. 2007, 'Trophic cul-de-sac, Pyrazus ebeninus, limits trophic transfer through an estuarine detritus-based food web', Blackwell Publishing Ltd, vol. 116, pp. 427-438. en_US
dc.identifier.issn 0030-1299 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3647
dc.description.abstract The importance to food-webs of trophic cul-de-sacs, species that channel energy flow away from higher trophic levels, is seldom considered outside of the pelagic systems in which they were first identified. On intertidal mudflats, inputs of detritus from saltmarshes, macroalgae or microphytobenthos are generally regarded as a major structuring force underpinning food-webs and there has been no consideration of trophic cul-de-sacs to date. A fully orthogonal three-factor experiment manipulating the density of the abundant gastropod, Pyrazus ebeninus, detritus and macrobenthic predators on a Sydney mudflat revealed large deleterious effects of the gastropod, irrespective of detrital loading or the presence of predators. Two months after experimental manipulation, the standing-stock of microphytobenthos in plots with high (44 per m(2)) densities of P. ebeninus was 20% less than in plots with low (4 per m(2)) densities. Increasing densities of P. ebeninus from low to high halved the abundance of macroinvertebrates and the average number of species. In contrast, the addition of detritus had differing effects on microphytobenthos (positively affected) and macroinvertebrates (negatively affected). Over the two-months of our experiment, no predatory mortality of P. ebeninus was observed and high densities of P. ebeninus decreased impacts of predators on macroinvertebrate abundances. Given that the dynamics of southeast Australian mudflats are driven more by disturbance than seasonality in predators and their interactions with prey, it is likely that Pyrazus would be similarly resistant to predation and have negative effects on benthic assemblages at other times of the year, outside of our study period. Thus, in reducing microphytobenthos and the abundance and species richness of macrofauna, high abundances of the detritivore P. ebeninus may severely limit the flow of energy up the food chain to commercially-important species. en_US
dc.publisher Blackwell Publishing Ltd en_US
dc.relation.isbasedon http://dx.doi.org/10.1111/j.2006.0030-1299.15557.x en_US
dc.title Trophic cul-de-sac, Pyrazus ebeninus, limits trophic transfer through an estuarine detritus-based food web en_US
dc.parent OIKOS en_US
dc.journal.volume 116 en_US
dc.journal.number en_US
dc.journal.number 3 en_US
dc.publocation Copenhagen, Denmark en_US
dc.identifier.startpage 427 en_US
dc.identifier.endpage 438 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 060200 en_US
dc.personcode 995485 en_US
dc.personcode 040098 en_US
dc.personcode 97055786 en_US
dc.personcode 040732 en_US
dc.personcode 890085 en_US
dc.personcode 870360 en_US
dc.percentage 100 en_US
dc.classification.name Ecology en_US
dc.classification.type FOR-08 en_US
dc.description.keywords CONCH STROMBUS-GIGAS; ILYANASSA-OBSOLETA; MUD SNAIL; COMMUNITY STRUCTURE; ENERGY-FLOW; PREDATION; ASSEMBLAGES; ECOLOGY; BOTTOM; FISH en_US
dc.staffid 870360 en_US


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