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Carrion Increases Landscape-Scale Scavenger Activity and Interactions.

Patrick B Finnerty1, Niraj Y Meisuria1, Luke J Baker1

  • 1School of Life and Environmental Sciences The University of Sydney Sydney New South Wales Australia.

Ecology and Evolution
|August 27, 2025
PubMed
Summary
This summary is machine-generated.

Carrion availability increases road use in dingoes and red foxes. Road use can indicate scavenging times, especially in winter when competition between these scavengers intensifies.

Keywords:
carrion availabilitycompetitive interactionsroad ecologyscavenger activitytemporal partitioning

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Area of Science:

  • Ecology
  • Wildlife biology
  • Conservation science

Background:

  • Carrion is a vital but unpredictable food source influencing ecosystem energy flow.
  • Scavenger activity is typically studied at carcasses, with limited understanding of landscape-scale impacts.
  • The influence of carrion on competing scavenger species' broader activity patterns is under-researched.

Purpose of the Study:

  • To investigate how experimental carrion provisioning affects the road use of dingoes (Canis dingo) and red foxes (Vulpes vulpes).
  • To explore seasonal variations in scavenger responses to carrion availability.
  • To assess temporal overlap and potential competition between dingoes and red foxes on roads and at carcasses.

Main Methods:

  • Deployment of 20 kangaroo carcasses across diverse habitats in southeast Australia.
  • Monitoring of dingo and red fox activity on roads using camera traps before and after carcass deployment.
  • Simultaneous camera trap monitoring of scavenger activity at the deployed carcasses.

Main Results:

  • Both dingoes and red foxes showed increased road use after carcass deployment.
  • Red foxes exhibited a stronger increase in road use during winter months.
  • Temporal overlap in activity between dingoes and red foxes increased on roads and at carcasses, particularly in winter.

Conclusions:

  • Carrion availability influences scavenger activity beyond immediate carcass sites, impacting landscape-scale patterns.
  • Road use can serve as a proxy for scavenging activity, especially when carcasses are near roads.
  • Understanding carrion's role is crucial for managing scavenger dynamics and interspecific competition at landscape scales.