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

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dc.contributor.author Byers, James en_US
dc.contributor.author Wright, Jeffrey en_US
dc.contributor.author Gribben, Paul en_US
dc.contributor.editor en_US
dc.date.accessioned 2011-02-07T06:21:25Z
dc.date.available 2011-02-07T06:21:25Z
dc.date.issued 2010 en_US
dc.identifier 2009005467 en_US
dc.identifier.citation Byers James, Wright Jeffrey, and Gribben Paul 2010, 'Variable direct and indirect effects of a habitat-modifying invasive species on mortality of native fauna', Ecological Society of America, vol. 91, no. 6, pp. 1787-1798. en_US
dc.identifier.issn 0012-9658 en_US
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 Anadaraa??s susceptibility to predators. Specifically, Caulerpaa??s alteration of physical and chemical properties of the surrounding water and sediment deteriorate Anadaraa??s 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 Anadaraa??s 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 clamsa?? 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. en_US
dc.language en_US
dc.publisher Ecological Society of America en_US
dc.relation.isbasedon en_US
dc.relation.isbasedon http://dx.doi.org/10.1890/09-0712.1 en_US
dc.title Variable direct and indirect effects of a habitat-modifying invasive species on mortality of native fauna en_US
dc.parent Ecology en_US
dc.journal.volume 91 en_US
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 060200 en_US
dc.personcode 102921 en_US
dc.personcode 0000032434 en_US
dc.personcode 101424 en_US
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.staffid 101424 en_US


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