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Area of Science:

  • Ecology
  • Wildlife Conservation
  • Quantitative Biology

Background:

  • Camera traps (CTs) are widely used for wildlife monitoring, often employing detection rates as an index of relative abundance.
  • This method assumes a linear relationship between detection rate and true abundance, which may be compromised by density-dependent movement behaviors.
  • The extent to which movement patterns vary with density across different species remains largely unquantified.

Purpose of the Study:

  • To systematically review and meta-analyze the relationships between animal movement rate, home-range size, and population density in terrestrial mammals.
  • To simulate camera trap sampling under varying movement scenarios to assess the impact on abundance indices.
  • To evaluate the reliability of camera trap detection rates for estimating wildlife population trends when movement is density-dependent.

Main Methods:

  • Conducted a systematic literature review and meta-analysis of studies examining terrestrial mammal movement and density.
  • Quantified correlations between movement rate, home-range size, and population density across diverse taxa.
  • Developed simulation models of animal movement and camera trap placement to test detection rate indices under different density-dependent movement scenarios.

Main Results:

  • Movement rate and home-range size were found to be negatively correlated with population density and positively correlated with each other.
  • Significant variation in these relationships was observed across different mammalian taxa and populations.
  • Simulations indicated that detection rates can underestimate true abundance changes by up to 30%, particularly for species with restricted movement.

Conclusions:

  • The assumption of density-independent movement is frequently violated in mammals, impacting the accuracy of camera trap abundance indices.
  • Camera trap detection rates reflect a combination of true abundance and animal movement patterns.
  • Researchers and wildlife managers must account for density-dependent movement when interpreting camera trap data to avoid biased population trend estimations.