Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/15655
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dc.contributor.authorMcNatty, Aliceen
dc.contributor.authorAbbott, Kirstenen
dc.contributor.authorLester, Philip Jen
dc.date.accessioned2014-09-17T16:32:00Z
dc.date.issued2009en
dc.identifier.citationOecologia, 160(1), p. 187-194en
dc.identifier.issn1432-1939en
dc.identifier.issn0029-8549en
dc.identifier.urihttps://hdl.handle.net/1959.11/15655en
dc.description.abstractInvasive species can dramatically alter trophic interactions. Predation is the predominant trophic interaction generally considered to be responsible for ecological change after invasion. In contrast, how frequently competition from invasive species contributes to the decline of native species remains controversial. Here, we demonstrate how the trophic ecology of the remote atoll nation of Tokelau is changing due to competition between invasive ants (Anoplolepis gracilipes) and native terrestrial hermit crabs (Coenobita spp.) for carrion. A significant negative correlation was observed between A. gracilipes and hermit crab abundance. On islands with A. gracilipes, crabs were generally restricted to the periphery of invaded islands. Very few hermit crabs were found in central areas of these islands where A. gracilipes abundances were highest. Ant exclusion experiments demonstrated that changes in the abundance and distribution of hermit crabs on Tokelau are a result of competition. The ants did not kill the hermit crabs. Rather, when highly abundant A. gracilipes attacked crabs by spraying acid and drove crabs away from carrion resources. Analysis of naturally occurring N and C isotopes suggests that the ants are effectively lowering the trophic level of crabs. According to δ¹⁵ N values, hermit crabs have a relatively high trophic level on islands where A. gracilipes have not invaded. In contrast, where these ants have invaded we observed a significant decrease in δ¹⁵ N for all crab species. This result concurs with our experiment in suggesting long-term exclusion from carrion resources, driving co-occurring crabs towards a more herbivorous diet. Changes in hermit crab abundance or distribution may have major ramifications for the stability of plant communities. Because A. gracilipes have invaded many tropical islands where the predominant scavengers are hermit crabs, we consider that their competitive effects are likely to be more prominent in structuring communities than predation.en
dc.languageenen
dc.publisherSpringeren
dc.relation.ispartofOecologiaen
dc.titleInvasive ants compete with and modify the trophic ecology of hermit crabs on tropical islandsen
dc.typeJournal Articleen
dc.identifier.doi10.1007/s00442-009-1279-zen
dc.subject.keywordsInvasive Species Ecologyen
dc.subject.keywordsInvertebrate Biologyen
dc.subject.keywordsCommunity Ecology (excl Invasive Species Ecology)en
local.contributor.firstnameAliceen
local.contributor.firstnameKirstenen
local.contributor.firstnamePhilip Jen
local.subject.for2008050103 Invasive Species Ecologyen
local.subject.for2008060202 Community Ecology (excl Invasive Species Ecology)en
local.subject.for2008060808 Invertebrate Biologyen
local.subject.seo2008960402 Control of Animal Pests, Diseases and Exotic Species in Coastal and Estuarine Environmentsen
local.subject.seo2008970106 Expanding Knowledge in the Biological Sciencesen
local.profile.schoolSchool of Science and Technologyen
local.profile.emailkabbott6@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20140904-101720en
local.publisher.placeGermanyen
local.format.startpage187en
local.format.endpage194en
local.peerreviewedYesen
local.identifier.volume160en
local.identifier.issue1en
local.contributor.lastnameMcNattyen
local.contributor.lastnameAbbotten
local.contributor.lastnameLesteren
dc.identifier.staffune-id:kabbott6en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:15891en
local.identifier.handlehttps://hdl.handle.net/1959.11/15655en
dc.identifier.academiclevelAcademicen
local.title.maintitleInvasive ants compete with and modify the trophic ecology of hermit crabs on tropical islandsen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 709<br />Views: 736<br />Downloads: 0en
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