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The use of photographic rates to estimate densities of tigers and other cryptic mammals: a comment on misleading conclusions

The use of photographic rates to estimate densities of tigers and other cryptic mammals: a... The search for easy‐to‐use indices that substitute for direct estimation of animal density is a common theme in wildlife and conservation science, but one fraught with well‐known perils (Nichols & Conroy, 1996; Yoccoz, Nichols & Boulinier, 2001; Pollock et al., 2002). To establish the utility of an index as a substitute for an estimate of density, one must: (1) demonstrate a functional relationship between the index and density that is invariant over the desired scope of inference; (2) calibrate the functional relationship by obtaining independent measures of the index and the animal density; (3) evaluate the precision of the calibration (Diefenbach et al., 1994). Carbone et al. (2001) argue that the number of camera‐days per photograph is a useful index of density for large, cryptic, forest‐dwelling animals, and proceed to calibrate this index for tigers (Panthera tigris). We agree that a properly calibrated index may be useful for rapid assessments in conservation planning. However, Carbone et al. (2001), who desire to use their index as a substitute for density, do not adequately address the three elements noted above. Thus, we are concerned that others may view their methods as justification for not attempting directly to estimate animal densities, without due regard for the shortcomings of their approach. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Animal Conservation Wiley

The use of photographic rates to estimate densities of tigers and other cryptic mammals: a comment on misleading conclusions

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References (16)

Publisher
Wiley
Copyright
"Copyright © 2002 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
1367-9430
eISSN
1469-1795
DOI
10.1017/S1367943002002160
Publisher site
See Article on Publisher Site

Abstract

The search for easy‐to‐use indices that substitute for direct estimation of animal density is a common theme in wildlife and conservation science, but one fraught with well‐known perils (Nichols & Conroy, 1996; Yoccoz, Nichols & Boulinier, 2001; Pollock et al., 2002). To establish the utility of an index as a substitute for an estimate of density, one must: (1) demonstrate a functional relationship between the index and density that is invariant over the desired scope of inference; (2) calibrate the functional relationship by obtaining independent measures of the index and the animal density; (3) evaluate the precision of the calibration (Diefenbach et al., 1994). Carbone et al. (2001) argue that the number of camera‐days per photograph is a useful index of density for large, cryptic, forest‐dwelling animals, and proceed to calibrate this index for tigers (Panthera tigris). We agree that a properly calibrated index may be useful for rapid assessments in conservation planning. However, Carbone et al. (2001), who desire to use their index as a substitute for density, do not adequately address the three elements noted above. Thus, we are concerned that others may view their methods as justification for not attempting directly to estimate animal densities, without due regard for the shortcomings of their approach.

Journal

Animal Conservation – Wiley

Published: May 1, 2002

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