Density-dependent facilitation cascades determine epifaunal community structure in temperate Australian mangroves

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Show simple item record Bishop, Melanie en_US Byers, James en_US Marcek, Benjamin en_US Gribben, Paul en_US
dc.contributor.editor en_US 2012-10-12T03:33:20Z 2012-10-12T03:33:20Z 2012 en_US
dc.identifier 2011004365 en_US
dc.identifier.citation Bishop Melanie et al. 2012, 'Density-dependent facilitation cascades determine epifaunal community structure in temperate Australian mangroves', Ecological Society of America, vol. 93, no. 6, pp. 1388-1401. en_US
dc.identifier.issn 0012-9658 en_US
dc.identifier.other C1 en_US
dc.description.abstract Co-occurring foundation species can determine biological community structure via facilitation cascades. We examined the density dependencies of facilitation cascades, including how the density of a basal foundation species influences the density of secondary foundation species, and how the density of secondary foundation species influences community structure. The system in which we assessed density dependencies was a temperate mangrove forest in which pneumatophores trap the fucoid alga Hormosira banksii and provide substrate for the oyster, Saccostrea glomerata. The alga and oyster in turn determine benthic community structure. In the field, algal biomass was positively correlated with pneumatophore density. Oysters, by contrast, were highly over-dispersed and correlated with the presence/ absence of pneumatophores. Epifaunal abundance and species richness were positively correlated with algal and oyster abundance, but their effects were independent. The positive effect of pneumatophore density on epifauna was primarily an indirect effect of trapping more algae. Pneumatophores did not directly influence invertebrate communities. Experiments revealed that, at very low pneumatophore densities, algal retention was insufficient to facilitate epifauna above that found on pneumatophores alone. At higher densities, however, increasing the density of pneumatophores increased algal retention, and the density and diversity of associated invertebrates. Shading by the mangrove canopy reduced algal biomass but did not modify the density-dependent nature of the cascade. Our results extend facilitation theory by showing that the density of both basal and secondary foundation species can be critical in triggering facilitation cascades. Our study also reveals that, where foundation species cooccur, multiple, independent cascades may arise from a single basal facilitator. en_US
dc.language en_US
dc.publisher Ecological Society of America en_US
dc.relation.isbasedon en_US
dc.relation.isbasedon en_US
dc.title Density-dependent facilitation cascades determine epifaunal community structure in temperate Australian mangroves en_US
dc.parent Ecology en_US
dc.journal.volume 93 en_US
dc.journal.number 6 en_US
dc.publocation Washington DC, USA en_US
dc.identifier.startpage 1388 en_US
dc.identifier.endpage 1401 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 050100 en_US
dc.personcode 995485 en_US
dc.personcode 0000073929 en_US
dc.personcode 0000077126 en_US
dc.personcode 101424 en_US
dc.percentage 34 en_US Ecological Applications en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Australian mangrove; Avicennia marina; density dependence; ecosystem engineers; facilitation; foundation or habitat-forming species; hierarchical facilitation; Hormosira banksii; oysters; pneumatophores; positive interactions; trait mediation en_US
dc.staffid 101424 en_US

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