Aggression in bottlenose dolphins: evidence for sexual coercion, male-male competition, and female tolerance through analysis of tooth-rake marks and behaviour Erin M. Scott 1) , Janet Mann 1,2,4) , Jana J. Watson-Capps 1) , Brooke L. Sargeant 1) & Richard C. Connor 3) ( 1 Department of Biology, Reiss Science Building, Georgetown University, Washington DC, 20057, USA; 2 Department of Psychology, White-Gravenor Building, Georgetown University, Washington DC, 20057, USA; 3 Department of Biology, University of Massachusetts at Dartmouth, Dartmouth, MA, 02543, USA) (Accepted: 21 October 2004) Summary Aggressive behaviour is rarely observed, but may have a large impact on the social struc- ture, relationships and interactions in animal societies. Long-term behavioural study of Indian Ocean bottlenose dolphins in Shark Bay, Australia, suggests that males are more aggressive than females, and use sexual coercion during the breeding season, but age and sex-specific patterns of aggression have not been well documented. We analyzed tooth rake marks, an indirect measure of received conspecific aggression, to determine such patterns by age, sex, and adult female reproductive state. Photographs of 224 Shark Bay bottlenose dolphins were examined for tooth rakes and each rake was categorized as new (broken skin), obvious (white rake lines
Behaviour – Brill
Published: Jan 1, 2005
Keywords: TURSIOPS SP; BOTTLENOSE DOLPHINS; TOOTH RAKES; SEXUAL COERCION; INTRA-SPECIFIC AGGRESSION; FEMALE TOLERANCE
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