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Clarifying the relationship between torpor and anthropogenic extinction risk in mammals

Hanna, Emily; Cardillo, Marcel

Description

The ability to undertake torpor has been linked with human-mediated extinction risk in mammals, but whether torpor serves to elevate or decrease extinction risk, and the mechanism by which it does so, remain controversial. We attempt to clarify the torpor - extinction risk association in a phylogenetic comparative analysis of 284 Australian mammal species. We show that the association is strongly mediated by body size. When body mass is included as a covariate, regression models show a negative...[Show more]

dc.contributor.authorHanna, Emily
dc.contributor.authorCardillo, Marcel
dc.date.accessioned2015-12-10T23:22:13Z
dc.identifier.issn0952-8369
dc.identifier.urihttp://hdl.handle.net/1885/66440
dc.description.abstractThe ability to undertake torpor has been linked with human-mediated extinction risk in mammals, but whether torpor serves to elevate or decrease extinction risk, and the mechanism by which it does so, remain controversial. We attempt to clarify the torpor - extinction risk association in a phylogenetic comparative analysis of 284 Australian mammal species. We show that the association is strongly mediated by body size. When body mass is included as a covariate, regression models show a negative association between the ability to undertake torpor and current threat status. This association is present in two categories of mammal species likely to be at particular risk from introduced predators (medium-sized species and species listed as threatened by predation in the International Union for Conservation of Nature Red List), but there is no association among species not in these categories. This suggests that torpor reduces vulnerability to predators, perhaps by limiting the amount of time spent foraging. However, the association between torpor and extinction risk is also stronger in smaller species, which are more likely to benefit from a reduced energy budget in Australia's low-productivity and unpredictable environment. We conclude that the ability to undertake torpor is clearly an advantage to mammal species in coping with human impacts, and that this advantage is conferred through a combination of reduced exposure to predators and reduced energy requirements.
dc.publisherZoological Society of London
dc.sourceJournal of Zoology
dc.titleClarifying the relationship between torpor and anthropogenic extinction risk in mammals
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume293
dc.date.issued2014
local.identifier.absfor050202 - Conservation and Biodiversity
local.identifier.absfor050103 - Invasive Species Ecology
local.identifier.ariespublicationu9511635xPUB1283
local.type.statusPublished Version
local.contributor.affiliationHanna, Emily, College of Medicine, Biology and Environment, ANU
local.contributor.affiliationCardillo, Marcel, College of Medicine, Biology and Environment, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage211
local.bibliographicCitation.lastpage217
local.identifier.doi10.1111/jzo.12136
local.identifier.absseo960805 - Flora, Fauna and Biodiversity at Regional or Larger Scales
local.identifier.absseo960405 - Control of Pests, Diseases and Exotic Species at Regional or Larger Scales
dc.date.updated2015-12-10T10:29:12Z
local.identifier.scopusID2-s2.0-84903300852
local.identifier.thomsonID000337972800008
CollectionsANU Research Publications

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