Sympatric prey responses to lethal top-predator control: predator manipulation experiments

Allen, Benjamin L., Allen, Lee R., Engeman, Richard M. and Leung, Luke K-P (2014) Sympatric prey responses to lethal top-predator control: predator manipulation experiments. Frontiers in Zoology, 11 1: 56.1-56.30. doi:10.1186/s12983-014-0056-y

Author Allen, Benjamin L.
Allen, Lee R.
Engeman, Richard M.
Leung, Luke K-P
Title Sympatric prey responses to lethal top-predator control: predator manipulation experiments
Journal name Frontiers in Zoology   Check publisher's open access policy
ISSN 1742-9994
Publication date 2014
Sub-type Article (original research)
DOI 10.1186/s12983-014-0056-y
Open Access Status DOI
Volume 11
Issue 1
Start page 56.1
End page 56.30
Total pages 30
Place of publication London, United Kingdom
Publisher BioMed Central Ltd.
Collection year 2015
Language eng
Abstract Many prey species around the world are suffering declines due to a variety of interacting causes such as land use change, climate change, invasive species and novel disease. Recent studies on the ecological roles of top-predators have suggested that lethal top-predator control by humans (typically undertaken to protect livestock or managed game from predation) is an indirect additional cause of prey declines through trophic cascade effects. Such studies have prompted calls to prohibit lethal top-predator control with the expectation that doing so will result in widespread benefits for biodiversity at all trophic levels. However, applied experiments investigating in situ responses of prey populations to contemporary top-predator management practices are few and none have previously been conducted on the eclectic suite of native and exotic mammalian, reptilian, avian and amphibian predator and prey taxa we simultaneously assess. We conducted a series of landscape-scale, multi-year, manipulative experiments at nine sites spanning five ecosystem types across the Australian continental rangelands to investigate the responses of sympatric prey populations to contemporary poison-baiting programs intended to control top-predators (dingoes) for livestock protection. Results: Prey populations were almost always in similar or greater abundances in baited areas. Short-term prey responses to baiting were seldom apparent. Longer-term prey population trends fluctuated independently of baiting for every prey species at all sites, and divergence or convergence of prey population trends occurred rarely. Top-predator population trends fluctuated independently of baiting in all cases, and never did diverge or converge. Mesopredator population trends likewise fluctuated independently of baiting in almost all cases, but did diverge or converge in a few instances. Conclusions: These results demonstrate that Australian populations of prey fauna at lower trophic levels are typically unaffected by top-predator control because top-predator populations are not substantially affected by contemporary control practices, thus averting a trophic cascade. We conclude that alteration of current top-predator management practices is probably unnecessary for enhancing fauna recovery in the Australian rangelands. More generally, our results suggest that theoretical and observational studies advancing the idea that lethal control of top-predators induces trophic cascades may not be as universal as previously supposed.
Keyword Canis lupus dingo
Carnivore conservation
Fauna recovery planning
Ground-dwelling birds
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2015 Collection
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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 7 times in Scopus Article | Citations
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Created: Thu, 16 Oct 2014, 11:10:00 EST by Dr Luke Leung on behalf of School of Agriculture and Food Sciences