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Estimating Population Density of Amazonian Titi Monkeys (Callicebus discolor) via Playback Point Counts

Authors

  • Anand Dacier,

    1. Department of Anthropology, New York University, 25 Waverly Place, New York, New York 10003, U.S.A.
    2. New York Consortium in Evolutionary Primatology, 25 Waverly Place, New York, New York 10003, U.S.A.
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  • Ana Gabriela de Luna,

    1. Facultad de Ciencias Biológicas, Universidad Complutense de Madrid, Ciudad Universitaria, Madrid 28040, Spain
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  • Eduardo Fernandez-Duque,

    1. Department of Anthropology, University of Pennsylvania, 3260 South Street Philadelphia, Pennsylvania 19104, U.S.A.
    2. Centro de Ecología Aplicada del Litoral (CECOAL-Conicet), Corrientes (3400), Argentina
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  • Anthony Di Fiore

    1. Department of Anthropology, New York University, 25 Waverly Place, New York, New York 10003, U.S.A.
    2. New York Consortium in Evolutionary Primatology, 25 Waverly Place, New York, New York 10003, U.S.A.
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ABSTRACT

We describe a new method for estimating population density of vocally responsive animals, which is based on playback calls coupled with auditory point transect sampling. The method yielded, for red titi monkeys (Callicebus discolor), better estimates than traditional line transect surveys. We propose it as an effective alternative for sampling certain cryptic, but vocally responsive animal species.

Abstract

Describimos un nuevo método para estimar la densidad poblacional de animales que combina muestreos puntuales auditivos con la utilización de grabaciones de llamadas. En el caso del mono titi rojo (Callicebus discolor), el método resultó en mejores estimaciones que las obtenidas con el tradicional muestreo de transectas lineares. Proponemos el método como una alternativa válida para muestrear ciertas especies de animales que son crípticas pero que responden vocalmente.

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