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Localized deer absence leads to tick amplification.

Sarah E Perkins1, Isabella M Cattadori, Valentina Tagliapietra

  • 1Center for Infectious Disease Dynamics, 208 Mueller Laboratory, Pennsylvania State University, Pennsylvania 16802, USA. sep18@psu.edu

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|August 30, 2006
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Summary

Removing deer, which dilute tick-borne diseases, can paradoxically increase tick density in small areas. This may lead to hotspots for diseases like tick-borne encephalitis (TBE).

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Area of Science:

  • Ecology
  • Epidemiology
  • Vector-borne disease research

Background:

  • Deer act as dilution hosts for tick-borne pathogens, meaning their presence reduces disease transmission risk.
  • The impact of deer absence on tick density and pathogen transmission is not fully understood and may depend on spatial scale.

Purpose of the Study:

  • To investigate how the absence of deer affects tick density and the transmission of tick-borne pathogens.
  • To test the hypothesis that deer absence can lead to increased tick density and disease transmission, particularly at smaller spatial scales.

Main Methods:

  • A meta-analysis was conducted to assess the relationship between deer exclosure size and questing tick density.
  • A field experiment compared tick intensity on competent hosts (rodents) in small deer exclosures versus control areas.

Main Results:

  • Meta-analysis showed larger deer exclosures decreased tick density, while smaller ones (<2.5 ha) increased it.
  • Larval tick intensity on rodents did not differ, but nymphal tick intensity was higher in deer exclosures.
  • Tick-borne encephalitis (TBE) seropositive rodents were found in a deer exclosure, but not in controls.

Conclusions:

  • Localized absence of deer can increase tick feeding on rodents, potentially creating hotspots for tick-borne diseases.
  • Small-scale deer removal may inadvertently amplify disease transmission risk, necessitating careful consideration in wildlife and disease management strategies.