Journal of Agricultural, Biological, and Environmental Statistics

, Volume 14, Issue 3, pp 322–337

Estimating overlap of daily activity patterns from camera trap data


DOI: 10.1198/jabes.2009.08038

Cite this article as:
Ridout, M.S. & Linkie, M. JABES (2009) 14: 322. doi:10.1198/jabes.2009.08038


Data from camera traps that record the time of day at which photographs are taken are used widely to study daily activity patterns of photographed species. It is often of interest to compare activity patterns, for example, between males and females of a species or between a predator and a prey species. In this article we propose that the similarity between two activity patterns may be quantified by a measure of the extent to which the patterns overlap. Several methods of estimating this overlap measure are described and their comparative performance for activity data is investigated in a simulation study. The methods are illustrated by comparing activity patterns of three sympatric felid species using data from camera traps in Kerinci Seblat National Park, Sumatra.

Key Words

Circular dataClouded leopard (Neofelis diardi)Golden cat (Catopuma Temminckii)Kernel density estimationOverlap coefficientSumatran tiger (Panthera Tigris)Trigonometric sum distribution

Copyright information

© International Biometric Society 2009

Authors and Affiliations

  1. 1.Institute of Mathematics, Statistics and Actuarial ScienceUniversity of KentCanterburyU.K.
  2. 2.Durrell Institute of Conservation and EcologyUniversity of KentCanterburyU.K.
  3. 3.Fauna & Flora International Program AcehNanggroe Aceh DarussalamIndonesia