Variable direct and indirect effects of a habitat-modifying invasive species on mortality of native fauna

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dc.contributor.author Byers, JE
dc.contributor.author Wright, JT
dc.contributor.author Gribben, PE
dc.date.accessioned 2011-02-07T06:21:25Z
dc.date.issued 2010-01
dc.identifier.citation Ecology, 2010, 91 (6), pp. 1787 - 1798
dc.identifier.issn 0012-9658
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/13411
dc.description.abstract Habitat-modifying invasive species can influence rates of predation on native prey either directly by providing protective structure or indirectly by modifying traits of prey species responding to the habitat. The alga Caulerpa taxifolia is one of the most successful invasive species of shallow-water marine systems globally, often provisioning habitat in areas previously lacking in vegetated structure. We experimentally evaluated the direct effect of Caulerpa to provide refuge for the native clam Anadara trapezia and how this balances with its influence on two trait-mediated indirect interactions that increase Anadaraâs susceptibility to predators. Specifically, Caulerpaâs alteration of physical and chemical properties of the surrounding water and sediment deteriorate Anadaraâs condition and predator resistance properties and also cause Anadara, though normally buried, to project from beneath the sediment, exposing it to predators. Our results show that Anadara are somewhat (but not consistently) protected from predators by living among Caulerpa. Shallow burial depth did not counteract this protective effect. However at times of year when predator activity diminishes and conducive environmental conditions develop, negative effects of Caulerpa habitat such as hypoxia and lowered flow may dominate. Under such situations, poor clam condition accentuates Anadaraâs susceptibility to mortality. Ultimately, a slight and inconsistent positive effect of Caulerpa to protect Anadara from predators is exceeded by the strong negative effect of Caulerpa on clam mortality, which is heightened by clamsâ weakened condition produced by chronic exposure to Caulerpa. Our results show that invasive habitat-modifying species can affect mortality of native species not simply through obvious positive direct effects of their protective structure, but indirectly through contrasting negative modification of the traits of prey species responding to the habitat.
dc.publisher Ecological Society of America
dc.relation.isbasedon 10.1890/09-0712.1
dc.title Variable direct and indirect effects of a habitat-modifying invasive species on mortality of native fauna
dc.type Journal Article
dc.parent Ecology
dc.journal.volume 6
dc.journal.volume 91
dc.journal.number 6 en_US
dc.publocation Washington DC, USA en_US
dc.identifier.startpage 1787 en_US
dc.identifier.endpage 1798 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 101424
dc.personcode 102921
dc.percentage 100 en_US
dc.classification.name Ecology 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 Anadara trapezia; behavioral modification; benthic infauna; Caulerpa taxifolia; ecosystem engineering; foundation species; New South Wales, Australia; nonnative species; prey refuges; soft sediment communities; sublethal effects; trait-mediated indirect interactions. en_US
dc.description.keywords Anadara trapezia
dc.description.keywords behavioral modification
dc.description.keywords benthic infauna
dc.description.keywords Caulerpa taxifolia
dc.description.keywords ecosystem engineering
dc.description.keywords foundation species
dc.description.keywords New South Wales, Australia
dc.description.keywords nonnative species
dc.description.keywords prey refuges
dc.description.keywords soft sediment communities
dc.description.keywords sublethal effects
dc.description.keywords trait-mediated indirect interactions.
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 Closed (ID: 3)
utslib.collection.history Uncategorised (ID: 363)


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