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A Real-Time Interactive System for Studying Confrontational Pursuit Behavior in Rodents
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Intraguild relationships between sympatric predators exposed to lethal control: predator manipulation experiments.

Benjamin L Allen1, Lee R Allen, Richard M Engeman

  • 1The University of Queensland, School of Agriculture and Food Sciences, Warrego Highway, Gatton, QLD 4343, Australia. benjamin.allen@daff.qld.gov.au.

Frontiers in Zoology
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Lethal control of dingoes in Australia did not lead to mesopredator release, as poison baits affected multiple species and dingo populations recovered quickly. Native prey are unlikely to be negatively impacted by these dingo control practices.

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Area of Science:

  • Ecology
  • Wildlife Management
  • Conservation Biology

Background:

  • Top predators regulate food webs; lethal control may release mesopredators, harming native fauna via trophic cascades.
  • Experimental data on predator guild interactions from lethal control are scarce, especially across diverse taxa.
  • This study assesses mesopredator responses to dingo control in Australian rangelands.

Purpose of the Study:

  • To investigate mesopredator (red foxes, feral cats, goannas) responses to dingo poisoning programs.
  • To determine if lethal control of top predators causes mesopredator release and potential trophic cascades.
  • To evaluate the impact of non-selective poison baiting on predator-prey dynamics.

Main Methods:

  • Landscape-scale, multi-year manipulative experiments across nine sites and five ecosystem types.
  • Monitoring mesopredator abundance in areas with and without poison baiting for dingo control.
  • Assessing responses of exotic mammals and native reptiles to top-predator population manipulation.

Main Results:

  • Mesopredator abundance was similar or greater in unbaited areas; trends were uncorrelated or positively correlated with top-predator abundance.
  • Exotic mammals and native reptiles showed poor responses to top-predator manipulation.
  • Poison baits were non-selective, leading to rapid dingo population recovery and averting trophic cascades.

Conclusions:

  • Australian native prey are unlikely to be negatively affected by dingo control via mesopredator release.
  • Current lethal control practices do not create conditions for mesopredator release.
  • Sporadic, non-selective lethal control may not significantly alter functional relationships within predator guilds.