From: German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig
Published May 10, 2017 04:08 PM

Estimating the size of animal populations from camera trap surveys

Remote motion-sensitive photography, or camera trapping, is revolutionizing surveys of wild animal populations. Camera trapping is an efficient means of detecting rare species, conducting species inventories and biodiversity assessments, estimating site occupancy, and observing behaviour. If individual animals can be identified from the images obtained, camera trapping data can also be used to estimate animal density and population size – information critical to effective wildlife management and conservation.

For this reason, camera traps were initially popularized by researchers studying big cats and other species with distinctive coat markings. Since then, thousands of camera traps have been deployed in wildlife habitat across the globe, especially in tropical forest ecosystems where animals are difficult to survey by other means. However, methods for estimating abundances of species which cannot be individually identified are still in development, and none is generally accepted or broadly applied.

Researchers from the University of St Andrews, the Max Planck Institute for Evolutionary Anthropology (MPI-EVA) and the German Centre for Integrative Biodiversity Research (iDiv) recently extended distance sampling analytical methods to accommodate data from camera traps. “Distance sampling is a very well-established statistical framework for estimating animal density and population size that is already familiar to many ecologists”, says Hjalmar Kühl of the MPI-EVA and iDiv. “This development will pave the way for researchers to estimate abundances of multiple species from camera trapping data collected over relatively short time intervals, without identifying individuals, and with minimal additional field work.” Kühl adds: “This new approach can be easily integrated into our ongoing camera trap surveys across a broad range of habitats and species; we will also apply it in our monitoring work."

Read more at German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig

Image: The Maxwell's duiker (Philantomba maxwellii), a small antelope that lives in western Africa (Photo: Paul Cools / Naturalist.org).

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