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

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dc.contributor.author Bishop, M
dc.contributor.author Byers, JE
dc.contributor.author Marcek, BJ
dc.contributor.author Gribben, PE
dc.date.accessioned 2012-10-12T03:33:20Z
dc.date.issued 2012-01
dc.identifier.citation Ecology, 2012, 93 (6), pp. 1388 - 1401
dc.identifier.issn 0012-9658
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/18114
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.
dc.publisher Ecological Society of America
dc.relation.isbasedon 10.1890/10-2296.1
dc.title Density-dependent facilitation cascades determine epifaunal community structure in temperate Australian mangroves
dc.type Journal Article
dc.parent Ecology
dc.journal.volume 6
dc.journal.volume 93
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
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.for 0603 Evolutionary Biology
dc.for 0501 Ecological Applications
dc.personcode 995485
dc.personcode 101424
dc.percentage 34 en_US
dc.classification.name Ecological Applications en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity 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.description.keywords Australian mangrove
dc.description.keywords Avicennia marina
dc.description.keywords density dependence
dc.description.keywords ecosystem engineers
dc.description.keywords facilitation
dc.description.keywords foundation or habitat-forming species
dc.description.keywords hierarchical facilitation
dc.description.keywords Hormosira banksii
dc.description.keywords oysters
dc.description.keywords pneumatophores
dc.description.keywords positive interactions
dc.description.keywords trait mediation
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
utslib.collection.history Uncategorised (ID: 363)
utslib.collection.history Closed (ID: 3)


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