Behavioural changes of two female zoo-held western lowland gorillas,after the introduction of a silverback male |
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| Authors: | JH Van Weerd Martin Knotters Paul J Van den Brink |
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| Institution: | 1. Artis Royal Zoo, P.O. Box 20164, 1000 HD Amsterdam, The Netherlands; present address: Melbourne Zoo, Zoos Victoria, Elliott Avenue, Parkville VIC 3052, Australia;2. Alterra, Wageningen University and Research centre, P.O. Box 47 6700 AA Wageningen, The Netherlands;3. Department of Aquatic Ecology and Water Quality Management, Wageningen University, Wageningen University and Research centre, P.O. Box 47, 6700 AA, Wageningen, The Netherlands;1. Faculty of Animal Science and Veterinary Medicine, Hue University of Agriculture and Forestry, Hue University, 102 Phung Hung st., Hue, Viet Nam;2. Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, PO Box 80.151, 3508 TD, Utrecht, The Netherlands;3. Animal Nutrition Group, Department of Animal Sciences, Wageningen University, Wageningen, The Netherlands;1. Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, 8903 Birmensdorf, Switzerland;2. Institute of Wildlife Biology and Game Management, University of Natural Resources and Life Sciences, Gregor-Mendel-Str. 33, 1180 Vienna, Austria |
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| Abstract: | Behavioural observations of the two female western lowland gorillas (Gorilla gorilla gorilla) composing an all-female group in Artis Royal Zoo (Amsterdam, the Netherlands) were evaluated. The two females had been observed for one-hr periods over a 166- day period, divided into a period before, and a period after the introduction of a new silverback male. Step intervention analysis showed that in both females locomotion and stereotypic behaviour significantly decreased after the introduction of the silverback. In one of the two females the public interaction also decreased significantly. |
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