Estimating overlap of daily activity patterns from camera trap data

Article

Abstract

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 data Clouded leopard (Neofelis diardiGolden cat (Catopuma TemminckiiKernel density estimation Overlap coefficient Sumatran tiger (Panthera TigrisTrigonometric sum distribution 

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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

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