Journal
BIOMETRICS
Volume 62, Issue 2, Pages 372-378Publisher
WILEY
DOI: 10.1111/j.1541-0420.2005.00493.x
Keywords
distance sampling; double observer; heterogeneity; mark-recapture; point independence
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Mark-recapture models applied to double-observer distance sampling data neglect the information on relative detectability of objects contained in the distribution of observed distances. A difference between the observed distribution and that predicted by the mark-recapture model is symptomatic of a failure of the assumption of zero correlation between detection probabilities implicit in the mark-recapture model. We develop a mark-recapture-based model that uses the observed distribution to relax this assumption to zero correlation at only one distance. We demonstrate its usefulness in coping with unmodeled heterogeneity using data from an aerial survey of crabeater seals in the Antarctic.
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