Comparing profile methods and site-occupancy modelling for the study of occurrence of an elusive species
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Based on 1,053 signs of presence collected between 2002 and 2006 by a network of well-trained observers, we modelled the occurrence of the Eurasian lynx (Lynx lynx) in France using two methods. The Mahalanobis distance factor analysis (MADIFA) provided a measure of habitat suitability based on environmental covariates, and site-occupancy modelling provided estimates of both presence and detection probabilities over time. Environmental covariates included in the site-occupancy modelling markedly improved the fit of the lynx presence model. We found a strong correlation between habitat suitability scores estimated from the MADIFA and probabilities of presence estimated from the site-occupancy modelling, indicating that both methods provided a convergent assessment of lynx potential occurrence.
KeywordsDetection probability Eurasian lynx Lynx lynx MADIFA Presence Spatial distribution
We thank Mark Kéry and two anonymous referees for their helpful comments that markedly improved our paper.
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