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Temporal partitioning of activity: rising and falling top-predator abundance triggers community-wide shifts in diel activity


Cunningham, CX and Scoleri, V and Johnson, CN and Barmuta, LA and Jones, ME, Temporal partitioning of activity: rising and falling top-predator abundance triggers community-wide shifts in diel activity, Ecography, 42, (12) pp. 2157-2168. ISSN 0906-7590 (2019) [Refereed Article]


Copyright Statement

2019 The Authors. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0)

DOI: doi:10.1111/ecog.04485


Top predators cause avoidance behaviours in competitors and prey, which can lead to niche partitioning and facilitate coexistence. We investigate changes in partitioning of the temporal niche in a mammalian community in response to both the rapid decline in abundance of a top predator and its rapid increase, produced by two concurrent natural experiments: 1) the severe decline of the Tasmanian devil due to a transmissible cancer, and 2) the introduction of Tasmanian devils to an island, with subsequent population increase. We focus on devils, two mesopredators and three prey species, allowing us to examine niche partitioning in the context of intra- and inter-specific competition, and predator-prey interactions. The most consistent shift in temporal activity occurred in devils themselves, which were active earlier in the night at high densities, presumably because of heightened intraspecific competition. When devils were rare, their closest competitor, the spotted-tailed quoll, increased activity in the early part of the night, resulting in increased overlap with the devil's temporal niche and suggesting release from interference competition. The invasive feral cat, another mesopredator, did not shift its temporal activity in response to either decreasing or increasing devil densities. Shifts in temporal activity of the major prey species of devils were stronger in response to rising than to falling devil densities. We infer that the costs associated with not avoiding predators when their density is rising (i.e. death) are higher than the costs of continuing to adopt avoidance behaviours as predator densities fall (i.e. loss of foraging opportunity), so rising predator densities may trigger more rapid shifts. The rapid changes in devil abundance provide a unique framework to test how the non-lethal effects of top predators affect community-wide partitioning of temporal niches, revealing that this top predator has an important but varied influence on the diel activity of other species.

Item Details

Item Type:Refereed Article
Keywords:apex predator, ecology of fear, invasive species, mesopredator release, predator-prey, temporal partitioning of activity, trophic cascade, Tasmanian devil, feral cat, quoll, temporal partitioning
Research Division:Environmental Sciences
Research Group:Environmental management
Research Field:Conservation and biodiversity
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Control of pests, diseases and exotic species in terrestrial environments
UTAS Author:Cunningham, CX (Mr Calum Cunningham)
UTAS Author:Scoleri, V (Mr Vince Scoleri)
UTAS Author:Johnson, CN (Professor Christopher Johnson)
UTAS Author:Barmuta, LA (Associate Professor Leon Barmuta)
UTAS Author:Jones, ME (Professor Menna Jones)
ID Code:136794
Year Published:2019
Funding Support:Australian Research Council (DP110103069)
Web of Science® Times Cited:10
Deposited By:Zoology
Deposited On:2020-01-17
Last Modified:2020-05-20
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