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ESTIMATING SITE OCCUPANCY RATES WHEN DETECTION PROBABILITIES ARE LESS THAN ONE
- D. MacKenzie, J. Nichols, Gideon B. Lachman, S. Droege, J. Andrew Royle, C. Langtimm
- Environmental ScienceEcology
- 1 August 2002
Nondetection of a species at a site does not imply that the species is absent unless the probability of detection is 1. We propose a model and likelihood-based method for estimating site occupancy…
Analysis and Management of Animal Populations
ESTIMATING SITE OCCUPANCY, COLONIZATION, AND LOCAL EXTINCTION WHEN A SPECIES IS DETECTED IMPERFECTLY
Few species are likely to be so evident that they will always be detected when present. Failing to allow for the possibility that a target species was present, but undetected, at a site will lead to…
ESTIMATION OF TIGER DENSITIES IN INDIA USING PHOTOGRAPHIC CAPTURES AND RECAPTURES
The tiger (Panthera tigris) is an endangered, large felid whose demographic status is poorly known across its distributional range in Asia. Previously applied methods for estimating tiger abundance,…
ESTIMATING ABUNDANCE FROM REPEATED PRESENCE–ABSENCE DATA OR POINT COUNTS
The method allows estimation of abundance from repeated observations of the presence or absence of animals without having to uniquely mark individuals in the population.
Statistical inference for capture-recapture experiments
ESTIMATING TEMPORARY EMIGRATION USING CAPTURE-RECAPTURE DATA WITH POLLOCK'S ROBUST DESIGN
A likelihood- based approach to dealing with temporary emigration is presented that permits estimation under different models of temporary em migration and yields tests for completely random and Markovian emigration.
Analysis and Management of Animal Populations: Modeling, Estimation and Decision Making
This book presents a framework for Modeling, Estimation, and Management of Animal Populations, and the use of Models in Conservation and Management and Combining Closed and Open Mark-Recapture Models: The Robust Design.
A DOUBLE-OBSERVER APPROACH FOR ESTIMATING DETECTION PROBABILITY AND ABUNDANCE FROM POINT COUNTS
- J. Nichols, J. Hines, J. Sauer, F. Fallon, J. E. Fallon, P. Heglund
- Environmental Science
- 1 April 2000
Abstract Although point counts are frequently used in ornithological studies, basic assumptions about detection probabilities often are untested. We apply a double-observer approach developed to…
CAPTURE-RECAPTURE SURVIVAL MODELS TAKING ACCOUNT OF TRANSIENTS
A class of CR models to describe the presence of transients is developed, which shows that intermediate situations between strict 'residence' and strict 'transience' may exist in certain studies and suggests that most of the time, if the study design takes into account the expected length of stay of a transient, it should be possible to efficiently separate the two categories of animals.