Dear MARMAM members, I am happy to share with you the exciting results of our publication in The Science of Nature: Gallo A, Lima ADM, Böye M, Hausberger M, Lemasson A. Study of repertoire use reveals unexpected context ‑ dependent vocalizations in bottlenose dolphins (*Tursiops truncatus*). Sci Nat. 2023; 1–13. doi:10.1007/s00114-023-01884-3
https://link.springer.com/article/10.1007/s00114-023-01884-3 Dolphins are known for their complex vocal communication, not least because of their capacity for acoustic plasticity. Paradoxically, we know little about their capacity for flexible vocal use. The difficulty in describing the behaviours performed underwater while vocalizing makes it difficult to analyse the contexts of emissions. Dolphins’ main vocal categories are typically considered to be used for scanning the environment (clicks), agonistic encounters (burst pulses) and socio-affiliative interactions (whistles). Dolphins can also combine these categories in mixed vocal emissions, whose use remains unclear. To better understand how vocalizations are used, we simultaneously recorded vocal production and the associated behaviours by conducting underwater observations (N = 479 events) on a group of 7 bottlenose dolphins under human care. Our results showed a non-random association between vocal categories and behavioural contexts. Precisely, clicks were preferentially emitted during affiliative interactions and not during other social/solitary contexts, supporting a possible complementary communicative function. Burst pulses were associated with high arousal contexts (agonistic and social play), pinpointing on their use as an “emotively charged” signal. Whistles were related to solitary swimming and not preferentially produced in any social context. This questions whistles’ functions and supports their potential role as a distant contact call. Finally, mixed vocalizations were especially found associated with sexual (bust pulse-whistle-click), solitary play (burst pulse-whistle) and affiliative (click-whistle) behaviours. Depending on the case, their emission seems to confirm, modify or refine the functions of their simple counterparts. These results open up new avenues of research into the contextual use of dolphin acoustic signals. Feel free to contact us if you want to exchange information about the paper. Happy holidays! Alice -- Dr. Alice Lima Sócia administradora - Ecosul Turismo Bióloga | Pós-doutoranda Programa de Pós-graduação em Sistemas Aquáticos Tropicais - PPGSAT Grupo de Pesquisa em Mamíferos Aquáticos de Ilhéus - GPMAI
_______________________________________________ MARMAM mailing list [email protected] https://lists.uvic.ca/mailman/listinfo/marmam
