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Table of Contents
Vol. 81, No. 5, 2010
Issue release date: January 2011
Section title: Original Article
Folia Primatol 2010;81:254–264
(DOI:10.1159/000322354)

A Direct Comparison of Scan and Focal Sampling Methods for Measuring Wild Chimpanzee Feeding Behaviour

Gilby I.C.a · Pokempner A.A.b · Wrangham R.W.a
aDepartment of Human Evolutionary Biology, Harvard University, Cambridge, Mass., and bWildlife Conservation Society, Bronx, N.Y., USA

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Article / Publication Details

First-Page Preview
Abstract of Original Article

Received: February 24, 2010
Accepted: October 19, 2010
Published online: December 22, 2010
Issue release date: January 2011

Number of Print Pages: 11
Number of Figures: 4
Number of Tables: 2

ISSN: 0015-5713 (Print)
eISSN: 1421-9980 (Online)

For additional information: http://www.karger.com/FPR

Abstract

Focal sampling is the most accurate method for measuring primate activity budgets but is sometimes impractical. An alternative is scan sampling, in which the behaviour of the group is recorded at regular intervals. The simplest technique is to record whether at least 1 animal is engaged in the behaviour of interest. By direct comparison with focal data collected simultaneously on the same population, we assess the validity of this simple group level sampling method for studying chimpanzee (Pan troglodytes schweinfurthii) feeding behaviour. In a 13-month study at Kanyawara, Kibale National Park, Uganda, group level scan sampling provided statistically similar measures of broad diet composition to those produced by focal data, despite considerable seasonal variation. Monthly means of the percentage of time spent consuming non-fig fruit calculated from group level scan sampling were highly correlated with those from focal sampling. This validates previous methodology used to identify periods of high energy availability. However, group level scans tended to overestimate the percentage of observation time spent feeding, particularly for adult males. We conclude that this method of group level scan sampling provides valuable data for characterizing broad diet choice in chimpanzees and other species, but may be of limited use for estimating individual feeding time.

© 2010 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Article

Received: February 24, 2010
Accepted: October 19, 2010
Published online: December 22, 2010
Issue release date: January 2011

Number of Print Pages: 11
Number of Figures: 4
Number of Tables: 2

ISSN: 0015-5713 (Print)
eISSN: 1421-9980 (Online)

For additional information: http://www.karger.com/FPR


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