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Cortisol changes in bottlenose dolphins in the dolphin interactive program

Matsushiro, Marin Kurono, Hirofumi Yamamoto, Keiko Kooriyama, Takanori 北海道大学

2021.05

概要

Several kinds of animals are utilized in animal-assisted interventions (AAIs) for humans, which release stress and/or provide motivation for muscle movement. It is important to monitor AAI animals’ stress levels to ensure their welfare. In the present study, we analyzed blood cortisol levels to evaluate the stress levels of Common bottlenose dolphin (Tursiops truncatus) in a dolphin interactive program (DIP). We sampled nine female dolphins that were used in the DIP in Motobu Genki village, Okinawa, Japan. Plasma cortisol levels were measured by ELISA, and the data were analyzed by comparing differences between seasons and before and after the DIPs on a given day. The average plasma cortisol level was 8.7±5.0 ng/ml and ranged from 1.6–29.3 ng/ml. Comparing before and after the DIP sessions on a given day, the average cortisol level of five dolphins decreased significantly. In comparison among seasons, average cortisol levels were significantly higher in the high visitor season than in the rising transition season (between the low and high visitor seasons) in two out of three animals. Regarding the falling transition season (between the high and low visitor seasons), two out of three animals tended to remain high in cortisol levels. From these results, we conclude that DIP induced little acute stress on dolphins. On the other hand, we showed the possibility of chronic stress in DIP-participating dolphins in the high visitor season. Further studies are needed to elucidate whether dolphins experience chronic stress by combining cortisol sampling with stress behavior monitoring.

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