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Evidence for acoustic discrimination in lemurs: a playback study on wild indris (Indri indri)

Articolo
Data di Pubblicazione:
2023
Abstract:
Indris Indri indri are group-living lemurs that occupy stable territories over several years and perform remarkable long-distance vocal displays. Vocal exchanges between long-term territory neighbors may contribute to assessing reciprocal resource-holding potentials, thus adaptively reducing the costs of territorial defense by limiting aggressive escalation. Previous work showed that indris’ songs show distinctive acoustic features at individual and group level. However, the possibility that indris use such cues for individual or group-level recognition has never been investigated experimentally. We conducted a playback experiment to test whether indris discriminate between familiar and nonfamiliar songs. Our rationale lies in the hypothesis of the dear enemy phenomenon, which predicts that territorial animals will show reduced ag- gression levels toward familiar neighbors compared with novel rivals. We played back stimulus recordings to wild indris from their territory boundaries and examined their responses in terms of vocal and behavioral indicators of willingness to engage in a fight. In line with our predic- tions, focal animals responded more rapidly and approached more often the speaker in re- sponse to playback stimuli of nonfamiliar individuals than to stimuli of neighboring groups. These results indicate that indris can discriminate between different classes of intruders based on distinctive acoustic features of their song choruses. We suggest that increased aggression directed toward unfamiliar intruders may be explained by higher threat levels associated with dispersal and group formation dynamics. We further discuss the relevance of these findings in a strepsirrhine primate model for comparative studies of vocal communication and sociality.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
acoustic communication, dear-enemy effect, neighbor–stranger discrimination, primate communication, song, territoriality.
Elenco autori:
Spezie, Giovanni; Torti, Valeria; Bonadonna, Giovanna; De Gregorio, Chiara; Valente, Daria; Giacoma, Cristina; Gamba, Marco
Autori di Ateneo:
GAMBA Marco
GIACOMA Cristina
TORTI VALERIA
VALENTE Daria
Link alla scheda completa:
https://iris.unito.it/handle/2318/1857980
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1857980/988003/Spezie%20et%20al.%202022_CurrZool.pdf
Pubblicato in:
CURRENT ZOOLOGY
Journal
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