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Video Tracking Protocol to Screen Deterrent Chemistries for Honey Bees
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Detecting deterrence from patrol data.

Andrew D M Dobson1, E J Milner-Gulland2, Colin M Beale3

  • 1School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FF, U.K.

Conservation Biology : the Journal of the Society for Conservation Biology
|September 22, 2018
PubMed
Summary
This summary is machine-generated.

Ranger patrols deter wildlife poaching, but effectiveness metrics are biased. New ΔCPUE-ΔE plots reliably measure patrol success by analyzing changes in illegal activity relative to enforcement effort.

Keywords:
aplicación de la leybushmeatcarne de cazacarne silvestrecaza furtivaconservaciónconservationlaw enforcementpoachingprotected areaswild meatáreas protegidas丛林肉保护保护地偷猎法律实施野味

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Area of Science:

  • Conservation science
  • Ecology
  • Law enforcement effectiveness

Background:

  • Protected areas face threats from illegal wildlife killing.
  • Ranger patrols are the primary method for detecting and deterring offenders.
  • Measuring deterrence is challenging due to biased patrol data.

Purpose of the Study:

  • To evaluate the reliability of common metrics for assessing wildlife law enforcement deterrence.
  • To develop a more robust method for monitoring the effectiveness of anti-poaching patrols.
  • To investigate the impact of patrol effort patterns on deterrence indicators.

Main Methods:

  • Simulated law breaking and enforcement using a mechanistic model.
  • Compared the common CPUE-E (illegal activities detected per unit of patrol effort vs. patrol effort) plots with novel ΔCPUE-ΔE (change in CPUE vs. change in effort) plots.
  • Assessed metric reliability under varying enforcement effort distributions and exogenous changes in offense frequency.

Main Results:

  • CPUE-E plots were unreliable indicators of deterrence.
  • ΔCPUE-ΔE plots reliably identified deterrence across different effort patterns and external factors.
  • The effectiveness of ΔCPUE-ΔE plots depends on knowing the approximate time lag between patrols and offender behavioral change.

Conclusions:

  • ΔCPUE-ΔE plots provide a robust and simple metric for monitoring patrol effectiveness in conservation.
  • Standard CPUE-E metrics are insufficient for accurately assessing deterrence.
  • Future research should address temporal autocorrelation in patrol data and the mechanisms of deterrence.