Variation in detection among passive infrared triggered-cameras used in wildlife research

Proceedings of the Annual Conference of the Southeastern Association of Fish and Wildlife Agencies
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Abstract

Precise and accurate estimates of demographics such as age structure, productivity, and density are necessary in determining habitat and harvest management strategies for wildlife populations. Surveys using automated cameras are becoming an increasingly popular tool for estimating these parameters. However, most camera studies fail to incorporate detection probabilities, leading to parameter underestimation. The objective of this study was to determine the sources of heterogeneity in detection for trail cameras that incorporate a passive infrared (PIR) triggering system sensitive to heat and motion. Images were collected at four baited sites within the Conecuh National Forest, Alabama, using three cameras at each site operating continuously over the same seven-day period. Detection was estimated for four groups of animals based on taxonomic group and body size. Our hypotheses of detection considered variation among bait sites and cameras. The best model (w=0.99) estimated different rates of detection for each camera in addition to different detection rates for four animal groupings. Factors that explain this variability might include poor manufacturing tolerances, variation in PIR sensitivity, animal behavior, and species-specific infrared radiation. Population surveys using trail cameras with PIR systems must incorporate detection rates for individual cameras. Incorporating time-lapse triggering systems into survey designs should eliminate issues associated with PIR systems.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Variation in detection among passive infrared triggered-cameras used in wildlife research
Series title Proceedings of the Annual Conference of the Southeastern Association of Fish and Wildlife Agencies
Volume 64
Year Published 2010
Language English
Publisher Southeast Association of Fish and Wildlifle Agencies
Contributing office(s) Coop Res Unit Atlanta
Description 6 p.
First page 125
Last page 130
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