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A method for censusing the greater white-nosed monkey in northeastern Gabon using the population density gradient in relation to roads

Published online by Cambridge University Press:  01 September 1998

S. A. Lahm ,
R. F. W. Barnes ,
K. Beardsley  and
P. Cervinka
S. A. Lahm
Affiliation:
Institut de Recherche en Écologie Tropicale, B.P. 180, Makokou, Gabon
R. F. W. Barnes
Affiliation:
Department of Biology 0116, University of California at San Diego, La Jolla, CA 92093–0116, USA
K. Beardsley
Affiliation:
Department of Environmental Science and Policy, Information Center for the Environment, University of California at Davis, Davis, CA 95616, USA
P. Cervinka
Affiliation:
Department of Agriculture and Resource Economics, University of California at Davis, Davis, CA 95616, USA
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Abstract

This paper presents a method for estimating monkey numbers in a large area of forest where there is a gradient of monkey densities. The method is illustrated using data collected in the northeastern forests of Gabon during an earlier project. These forests are sparsely populated and there are few roads. The density of Cercopithecus nictitans increases with distance from the nearest road. A geographic information system (GIS) divided the forest into bands of increasing distance from the nearest road. The number of monkeys in each band is the product of the monkey density in that band and the area of the band. Summing across bands gives the population estimate; the standard error can be estimated by bootstrapping. The optimum sample size can be estimated by simulation. Combining estimates of the density gradient with a GIS is a cost-effective method of censusing primates in extensive forests.

Type
Research Article
Information
Journal of Tropical Ecology , Volume 14 , Issue 5 , September 1998 , pp. 629 - 643
Copyright
© 1998 Cambridge University Press

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