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dc.contributor.authorHollings, Tracey
dc.contributor.authorJones, Menna
dc.contributor.authorMooney, Nick
dc.contributor.authorMccallum, Hamish
dc.date.accessioned2017-05-03T15:37:44Z
dc.date.available2017-05-03T15:37:44Z
dc.date.issued2014
dc.date.modified2014-08-05T23:05:06Z
dc.identifier.issn0888-8892
dc.identifier.doi10.1111/cobi.12152
dc.identifier.urihttp://hdl.handle.net/10072/61933
dc.description.abstractAs apex predators disappear worldwide, there is escalating evidence of their importance in maintaining the integrity and diversity of the ecosystems they inhabit. The largest extant marsupial carnivore, the Tasmanian devil (Sarcophilus harrisii) is threatened with extinction from a transmissible cancer, devil facial tumor disease (DFTD). The disease, first observed in 1996, has led to apparent population declines in excess of 95% in some areas and has spread to more than 80% of their range. We analyzed a long-term Tasmania-wide data set derived from wildlife spotlighting surveys to assess the effects of DFTD-induced devil decline on populations of other mammals and to examine the relative strength of top-down and bottom-up control of mesopredators between 2 regions with different environmental conditions. Collection of the data began >10 years before DFTD was first observed. A decrease in devil populations was immediate across diseased regions following DFTD arrival, and there has been no indication of population recovery. Feral cats (Felis catus) increased in areas where the disease was present the longest, and feral cat occurrence was significantly and negatively associated with devils. The smallest mesopredator, the eastern quoll (Dasyurus viverrinus), declined rapidly following DFTD arrival. This result suggests the species was indirectly protected by devils through the suppression of larger predators. Rainfall deficiency was also a significant predictor of their decline. Environmental variables determined the relative importance of top-down control in the population regulation of mesopredators. In landscapes of low rainfall and relatively higher proportions of agriculture and human settlement, top-down forces were dampened and bottom-up forces had the most effect on mesopredators. For herbivore prey species, there was evidence of population differences after DFTD arrival, but undetected environmental factors had greater effects. The unique opportunity to assess population changes over extensive temporal and spatial scales following apex predator loss further demonstrated their role in structuring ecosystems and of productivity in determining the strength of top-down control.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.publisherWiley-Blackwell Publishing
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom63
dc.relation.ispartofpageto75
dc.relation.ispartofissue1
dc.relation.ispartofjournalConservation Biology
dc.relation.ispartofvolume28
dc.rights.retentionY
dc.subject.fieldofresearchTerrestrial Ecology
dc.subject.fieldofresearchInvasive Species Ecology
dc.subject.fieldofresearchEnvironmental Sciences
dc.subject.fieldofresearchBiological Sciences
dc.subject.fieldofresearchAgricultural and Veterinary Sciences
dc.subject.fieldofresearchcode060208
dc.subject.fieldofresearchcode050103
dc.subject.fieldofresearchcode05
dc.subject.fieldofresearchcode06
dc.subject.fieldofresearchcode07
dc.titleTrophic Cascades Following the Disease-Induced Decline of an Apex Predator, the Tasmanian Devil
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.hasfulltextNo Full Text
gro.griffith.authorMcCallum, Hamish


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