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Feeding success of African wild dogs (Lycaon pictus) in the Serengeti: the effects of group size and kleptoparasitism

Published online by Cambridge University Press:  18 May 2005

C. Carbone
Affiliation:
Institute of Zoology, Zoological Society of London, Regents Park, London NW1 4RY, U.K.
L. Frame
Affiliation:
P.O. Box 822, Cape May Court House, NJ 08210, U.S.A.
G. Frame
Affiliation:
Gateway National Recreational Area, 210 New York Avenue, Staten Island, NY 10305, U.S.A.
J. Malcolm
Affiliation:
Department of Biology, University of Redlands, P.O. Box 3080, Redlands, CA 92373-0999, U.S.A.
J. Fanshawe
Affiliation:
Birdlife International, Wellbrook Court, Girton Road, Cambridge CB3 0NA, U.K.
C. FitzGibbon
Affiliation:
Rural Planning Services (RPS) Ltd, Willow Mere House, Compass Point Business Park, Stocks Bridge Way, St Ives, Cambridgeshire PE27 5JL, U.K.
G. Schaller
Affiliation:
Wildlife Conservation Society, New York Zoological Society, Bronx Park, New York, NY 10460, U.S.A.
I. J. Gordon
Affiliation:
Rangelands and Savannas Program, Sustainable Ecosystems, CSIRO – Davies Laboratory, PMB P.O., Aitkenvale, Queensland 4814, Australia
J. M. Rowcliffe
Affiliation:
Institute of Zoology, Zoological Society of London, Regents Park, London NW1 4RY, U.K.
J. T. Du Toit
Affiliation:
Mammal Research Institute, Department of Zoology and Entomology, University of Pretoria, Pretoria 0002, South Africa
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Abstract

Longer-term ecosystem level dynamics are often neglected in conservation studies involving single species. In this study, a retrospective analysis is presented on the feeding performance of African wild dogs Lycaon pictus in the Serengeti in relation to a competing species, the spotted hyena Crocuta crocuta, to test whether hyenas had an effect on feeding performance of wild dogs in this ecosystem. Our analysis is based on observations of over 700 wild dog kills recorded over a 20-year period (from 1964 to 1987) during which time there was a decline in wild dog numbers (ending with their local extinction in 1991) and a twofold increase in hyena density. Overall, the amount of time that dogs had access to the kill (access time) decreased with increasing numbers of hyenas attending kills, but access time increased with increasing hunting-group size of dogs and carcass mass. In addition, in the 1980s, dogs spent longer at kills than in the 1970s for a given set of conditions, including when hyenas were absent. Our analysis demonstrates a greater potential for group benefits than was found in a previous study (Carbone, Du Toit et al., 1997). Hunting-group sizes of between two and six dogs performed best when hyenas attended dog kills because the benefits of increased defence outweighed the costs of having to share the carcass with more dogs. Hunting-group sizes of wild dog and levels of hyena attendance at the kill broadly paralleled the population trends in these species, with hunting-group sizes of wild dog declining, followed by hyena attendance increasing. Despite the combined effects of increased hyena attendance and reduced hunting-group size, dogs in the 1980s typically spent longer feeding and consumed more of the carcass including the poorest sections. This suggests that dogs in the 1980s may have been under greater energetic stress.

Type
Research Article
Copyright
2005 The Zoological Society of London

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