Generalist predator's niche shifts reveal ecosystem changes in an experimentally fragmented landscape

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dc.contributor.authorResasco, Julian
dc.contributor.authorTuff, Kika T
dc.contributor.authorCunningham, Saul
dc.contributor.authorMelbourne, Brett A.
dc.contributor.authorHicks, Andrew J.
dc.contributor.authorNewsome, Seth D
dc.contributor.authorDavies, Kendi
dc.date.accessioned2019-07-26T05:56:24Z
dc.date.issued2017-10-07
dc.date.updated2019-03-31T07:22:53Z
dc.description.abstractHabitat fragmentation can alter the trophic structure of communities and environmental conditions, thus driving changes in biodiversity and ecosystem functions. Quantifying niches of generalist predators can reveal how fragmentation alters ecosystems. In a habitat fragmentation experiment, we used stable isotopes of a generalist predator skink to test predictions from spatial theory on trophic structure and to quantify abiotic changes associated with fragmentation among continuous forest, fragments, and matrix habitats. We predicted that in fragments and the matrix, isotopic niches would shift due to decreases in skink trophic positions (delta N-15) from reductions in trophic structure of arthropod food webs and abiotic changes over time (delta C-13) relative to continuous forest. Contrary to theoretical predictions, we did not find evidence of reductions in trophic structure with fragmentation. In fact, skink delta N-15 values were higher in the matrix and fragments than continuous forest, likely due to changes in distributions of a detritivorous prey species. In addition, delta C-13 values in the matrix decreased over years since fragmentation due to abiotic changes associated with matrix tree maturation. We show how isotopic niches are influenced by fragmentation via shifts in biotic and abiotic processes. The potential for either or both spatial and abiotic effects of fragmentation present a challenge for theory to better predict ecological changes in fragmented landscapes.en_AU
dc.description.sponsorshipThis work was funded by an NSF Postdoctoral Research Fellowship in Biology (DBI 1309192) to JR and NSF funding (DEB 0841892) to KFD and BAM and (DEB 1350872) to KFD.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0906-7590en_AU
dc.identifier.urihttp://hdl.handle.net/1885/164744
dc.language.isoen_AUen_AU
dc.publisherBlackwell Publishing Ltden_AU
dc.rights© 2017 The Authorsen_AU
dc.sourceEcographyen_AU
dc.titleGeneralist predator's niche shifts reveal ecosystem changes in an experimentally fragmented landscapeen_AU
dc.typeJournal articleen_AU
local.bibliographicCitation.issue7en_AU
local.bibliographicCitation.lastpage1219en_AU
local.bibliographicCitation.startpage1209en_AU
local.contributor.affiliationResasco, Julian, Department of Ecologyen_AU
local.contributor.affiliationTuff, Kika T., Dept of Ecology and Evolutionary Biologyen_AU
local.contributor.affiliationCunningham, Saul, College of Science, ANUen_AU
local.contributor.affiliationMelbourne, Brett A., University of Coloradoen_AU
local.contributor.affiliationHicks, Andrew J., University of Coloradoen_AU
local.contributor.affiliationNewsome, Seth D., University of New Mexicoen_AU
local.contributor.affiliationDavies, Kendi, University of Coloradoen_AU
local.contributor.authoremailu4593341@anu.edu.auen_AU
local.contributor.authoruidCunningham, Saul, u4593341en_AU
local.description.embargo2037-12-31
local.description.notesImported from ARIESen_AU
local.identifier.absfor050104 - Landscape Ecologyen_AU
local.identifier.absseo960800 - FLORA, FAUNA AND BIODIVERSITYen_AU
local.identifier.ariespublicationu4485658xPUB1878en_AU
local.identifier.citationvolume41en_AU
local.identifier.doi10.1111/ecog.03476en_AU
local.identifier.scopusID2-s2.0-85037360991
local.identifier.thomsonID000436854100014
local.identifier.uidSubmittedByu4485658en_AU
local.publisher.urlhttps://onlinelibrary.wiley.comen_AU
local.type.statusPublished Versionen_AU

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