Journal
JOURNAL OF MAMMALOGY
Volume 92, Issue 3, Pages 544-551Publisher
OXFORD UNIV PRESS INC
DOI: 10.1644/10-MAMM-A-029.1
Keywords
association pattern; Cephalorhynchus commersonii; Commerson's dolphin; Patagonia; social structure
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Funding
- National Research Council (CONICET) [PIP 0742/98]
- Agencia Nacional de Promocion Cientifica y Tecnologica [01-04030 A, 11679]
- Fundacion BBVA [BIOCON 04]
- Global Environment Facility Project [CNP-BB 27]
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We investigated the association patterns of 48 identifiable Commerson's dolphins (Cephalorhynchus commersonii) photographed 2 or more times over a 2-year period in Bahia Engano, Chubut, Argentina. The associations among them were not different from random for short time periods (7 days) but were significantly different from random for longer periods. Lagged identification rate and lagged association rate models show that dolphins remained in the area on average 15 days and then moved away as the original groups dissolved. Commerson's dolphins appear to have a fission fusion society, and the observed strength of their associations is in concordance with the predictions regarding their body size and ranging patterns. The dolphins seem to rely on Bahia Engano as a core area for most of their activities, but the aggregations are labile and some individuals remain associated in a more stable manner with only a few other individuals.
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