Social behaviour of captive belugas, Delphinapterus leucas
Recchia, Cheri A.
MetadataShow full item record
Focal-animal sampling techniques developed for investigating social behaviour of terrestrial animals were adapted for studying captive belugas, providing quantitative descriptions of social relationships .among individuals. Five groups of captive belugas were observed, allowing a cross-sectional view of sociality in groups of diverse sizes and compositions. Inter-individual distances were used to quantify patterns of spatial association. A set of social behaviours for which actor and recipient could be identified was defined to characterize dyadic interactions. The mother-calf pair spent more time together, and interacted more often than adults. The calf maintained proximity with his mother; larger adults generally maintained proximity with smaller adults. Among adults, larger groups performed more kinds of behaviours and interacted at higher rates than smaller groups. Within dyads, the larger whale performed more aggressive behaviours and the smaller whale more submissive behaviours. Clear dominance relations existed in three groups, with larger whales dominant to smaller whales. Vocalizations of three groups were classified subjectively, based on aural impressions and visual inspection of spectrograms, but most signals appeared graded. Statistical analyses of measured acoustic features confirmed subjective impressions that vocalizations could not be classified into discrete and homogeneous categories.
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 1994
Showing items related by title, author, creator and subject.
Orchestration : the movement and vocal behavior of free-ranging Norwegian killer whales (Orcinus orca) Shapiro, Ari D. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2008-06)Studying the social and cultural transmission of behavior among animals helps to identify patterns of interaction and information content flowing between individuals. Killer whales are likely to acquire traits culturally ...
Watwood, Stephanie Lynn (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-09)Male dolphins form stable, long-term alliances comparable to long-term relationships formed by terrestrial species. The goal of this thesis was to determine the effect of the formation of these alliances on vocal ...
Samuels, Amy (Woods Hole Oceanographic Institution, 1996-09)Research on cetacean social behavior is in transition from descriptive natural history to quantitative analyses. To expedite this change, an intellectual history of the field is provided, from the early whaler-naturalists ...