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Related Experiment Videos

Invading parasites cause a structural shift in red fox dynamics.

M C Forchhammer1, T Asferg

  • 1Department of Landscape Ecology, National Environmental Research Institute, Rønde, Denmark. mcf@dmu.dk

Proceedings. Biological Sciences
|May 20, 2000
PubMed
Summary

Sarcoptic mange significantly altered red fox population dynamics by affecting density dependence and fluctuation patterns. The spread of mange mites correlated with changes in fox population structures.

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Area of Science:

  • Ecology
  • Parasitology
  • Population Dynamics

Background:

  • Parasitic infections like sarcoptic mange can profoundly impact host life histories and population sizes.
  • Sarcoptic mange has caused significant declines in red fox populations, notably reducing abundance by over 70% in Fennoscandia.

Purpose of the Study:

  • To investigate the impact of sarcoptic mange on the population dynamics of red foxes.
  • To understand how sarcoptic mange influences density dependence and fluctuation patterns in red fox populations.

Main Methods:

  • Analysis of long-term (1955-1996) population data from 14 Danish red fox populations.
  • Integration of ecological theory with statistical modeling approaches.
  • Examination of spatial spread patterns of mange mites and their correlation with population dynamics.

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Main Results:

  • Sarcoptic mange invasion significantly altered both direct and delayed density dependence in red fox population dynamics.
  • Observed shifts in red fox population fluctuation patterns were associated with mange outbreaks.
  • The spatial progression of sarcoptic mange mirrored changes in the autocovariate structures of affected fox populations.

Conclusions:

  • Sarcoptic mange is a critical factor shaping red fox population dynamics beyond simple numerical responses.
  • Understanding the ecological impact of parasites is crucial for wildlife population management.
  • The study highlights the complex interplay between disease spread and host population regulation.