When Is a Species Declining? Optimizing Survey Effort to Detect Population Changes in Reptiles

• David Sewell,

  Affiliations Durrell Institute of Conservation and Ecology, School of Anthropology and Conservation, University of Kent, Canterbury, Kent, United Kingdom, School of Life Sciences, University of Sussex, Falmer, Brighton, United Kingdom

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• Gurutzeta Guillera-Arroita,

  Affiliation National Centre for Statistical Ecology, School of Mathematics, Statistics and Actuarial Science, University of Kent, Canterbury, Kent, United Kingdom

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• Richard A. Griffiths ,

  * E-mail: R.A.Griffiths@kent.ac.uk

  Affiliation Durrell Institute of Conservation and Ecology, School of Anthropology and Conservation, University of Kent, Canterbury, Kent, United Kingdom

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• Trevor J. C. Beebee

  Affiliation School of Life Sciences, University of Sussex, Falmer, Brighton, United Kingdom

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