Carnivore carcasses are avoided by carnivores

Area of Science:

• Ecology
• Evolutionary Biology
• Parasitology

Background:

• Traditional scavenging research prioritizes herbivore carcasses.
• Observations suggest scavengers avoid carnivore carrion, potentially due to parasite risk.
• Assumptions about trophic levels in carrion may overlook evolutionary dynamics.

Purpose of the Study:

• Investigate vertebrate scavenger use of mammalian carnivore carrion.
• Test the hypothesis that carnivore carcasses are avoided by other carnivores, especially conspecifics, to minimize parasitic exposure.
• Explore the coevolutionary relationship between carnivores, parasites, and scavenging behavior.

Main Methods:

• Field experiments comparing feeding rates and biomass consumption at herbivore versus carnivore carcasses.
• Evolutionary simulations modeling scavenger strategies under parasite transmission risks.
• Literature review assessing parasite life-history strategies and potential carnivore-carnivore transmission cycles.

Main Results:

• Herbivore carcasses attracted significantly more scavenger species and biomass consumption than carnivore carcasses.
• Scavenger detection times and species visitation rates were similar for both carcass types.
• Evolutionary simulations indicated parasite risk drives avoidance of cannibalism, contingent on mortality rates.

Conclusions:

• Carnivore carcasses are less utilized by scavengers, supporting the parasite avoidance hypothesis.
• A novel coevolutionary dynamic exists between carnivores and their parasites.
• Carnivore and herbivore carrion play distinct roles in food webs and ecosystem functioning.