Individual variation in activity budgets of a stable population of killer whales in managed care across a year.

Abstract

Activity budget investigations are necessary to understand how individuals within a group manage their daily activities, thus providing insights into the social dynamics of a species. Our objective was to explore and describe the behavioral activities within a group of managed care killer whales. From 261 hours of coded surface video collected from April 2022 to January 2023, we scan-sampled day-time hours to examine eight behavioral categories exhibited by 8-9 killer whales bimonthly. Minimal sex differences were found within each behavioral category across month and hour block. Females exhibited significantly more attention to trainers and rubbing on the environment than males. Individual variability was documented for all behavioral categories. The youngest male showed the most (43 % of scans) proximity and social interactions with conspecifics whereas all adults, both females and males, showed similar levels of social behavior. Three adult females and one adult male spent about a third of all scans observing their trainer(s) as they moved around the habitat. This observational behavior has been described in other delphinids as anticipatory behavior indicating a willingness to participate in future interactions with their trainers whether food rewards were available or not, and has been confirmed to represent a state of positive well-being. All killer whales actively engaged with peers and their environment in about 40 % of the documented scans. These findings are similar in degree to that observed in various other delphinid populations and support the interpretation that this killer whale group is in receive of positive welfare, displaying normal levels of social and individual behaviors for this species. Our results add to the growing body of knowledge about how killer whales manage their actions, both with conspecifics and their environment, across different social settings given their surroundings.