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Article Dans Une Revue Animal Cognition Année : 2021

Friend or foe: Risso's dolphins eavesdrop on conspecific sounds to induce or avoid intra-specific interaction

Résumé

The detection and use of emitters' signals by unintended receivers, i.e., eavesdropping, represents an important and oftenlow-cost way for animals to gather information from their environment. Acoustic eavesdropping can be a key driver inmediating intra- and interspecific interactions (e.g., cooperation, predator-prey systems), specifically in species such ascetaceans that use sound as a primary sensory modality. While most cetacean species produce context-specific sounds, littleis known about the use of those sounds by potential conspecific eavesdroppers. We experimentally tested the hypothesis thata social cetacean, Risso's dolphin (Grampus griseus), is able to gather biologically relevant information by eavesdroppingon conspecific sounds. We conducted playback experiments on free-ranging dolphins using three context-specific soundsstimuli and monitored their horizontal movement using visual or airborne focal follow observations. We broadcasted naturalsequences of conspecific foraging sounds potentially providing an attractive dinner bell signal (n = 7), male social soundssimulating a risk of forthcoming agonistic interaction (n = 7) and female-calf social sounds representing no particularlythreatening context (n = 7). We developed a quantitative movement response score and tested whether animals changed theirdirection of horizontal movement towards or away from the playback source. Dolphins approached the foraging and the socialfemale-calf sounds whereas they avoided the social male sounds. Hence, by acoustically eavesdropping on conspecifics, dol-phins can discriminate between social and behavioural contexts and anticipate potential threatening or beneficial situations.Eavesdropping and the ensuing classification of ?friend or foe' can thus shape intra-specific social interactions in cetaceans.

Dates et versions

hal-03616702 , version 1 (22-03-2022)

Identifiants

Citer

Lucie Beauchesne, Mathilde Massenet, Machiel G. Oudejans, Annebelle C. M. Kok, Fleur Visser, et al.. Friend or foe: Risso's dolphins eavesdrop on conspecific sounds to induce or avoid intra-specific interaction. Animal Cognition, 2021, 25, 10 p. ⟨10.1007/s10071-021-01535-y⟩. ⟨hal-03616702⟩

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