foxsim an individual-based population model of foxes and sarcoptic mange gösta nachman and mads c....
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FoxSimAn individual-based population model
of foxes and sarcoptic mange
Gösta Nachman and Mads C. Forchhammer
Department of Population Ecology
Zoological Institute
University of Copenhagen
Mads C. Forchhammer and Tommy Asferg: ”Invading parasites cause a structural shift in red fox
dynamics”
Proceedings of the Royal Society B (2000), 267, 779-786
Sarcoptic mange is a skin disease
• It is caused by the mite Sarcoptic scabiei var. vulpes
• Latency period from exposure is approximately one month
• The mite causes severe skin lessions and loss of hair
• Infected foxes usually die from starvation
• Infected animals normally live 7-8 months as compared with 3-4 years of heathy individuals
• Recovery from mange is rare
Fox territoryMale fox
Female fox
Offspring
Offspring leave parent’s territoryin order to establish their own
Single foxes tend to leave a territory
Mortality during dispersal depends on distance
Fight to gain territory
Infected maleHealthy female
Infected offspring
Infected pairs produce less offspring
Sick individuals infect healthy ones by physical contacts
Healthy individuals have higher mating chance
Infected individuals have reduced fitness
Sick individuals never recover from the disease
Foxdemo.exe Foxgraph.exe
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