Abstract # 13429 Poster # 93:

Scheduled for Thursday, August 22, 2019 06:00 PM-08:00 PM: (Alumni Lounge) Poster Presentation


VOCAL INDIVIDUALITY IN TWO NOTE TYPES OF THE DUET VOCALIZATIONS OF COPPERY TITI MONKEYS (PLECTUROCEBUS CUPREUS)

A. R. Lau1, D. J. Clink2 and K. L. Bales1
1University of California, Davis, 1 Shields Ave, Davis, CA 95616, USA, 2Cornell University
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     As social animals, many primates use acoustic communication to maintain social relationships. Pair-bonding primates, in particular, often participate in species-typical coordinated vocal duets. These pair-bonding species are typically territorial and maintain home range boundaries. Thus, recognition of one’s pair mate and neighbors should be selected for, as identifying conspecifics could decrease the need to participate in costly territorial defense behaviors. Vocal individuality has been shown in other duetting primates, such as gibbons and tarsiers. Here we present an analysis of 28 coppery titi monkey (Plecturocebus cupreus) morning duet vocalizations (N=135). We assessed individuality in two note types: chirps (highest frequency note type) and pulses (rapidly repeating notes between chirp sequences). We estimated features from the spectrogram and used discriminate function analysis (DFA) with leave-one-out cross-validation (LOOCV) to classify individuals. Based on chirp vocalizations we correctly classified individuals with a 63% accuracy using LOOCV based on 14 spectral and temporal parameters. With pulse vocalizations we classified individuals with a slightly higher accuracy of 70% based on 6 parameters. Despite the fact that titi monkey duets show relatively little sex-specificity and high overlap between duetting individuals, some portions of the duet are individually distinct. This provides evidence for vocal individuality in coppery titi monkeys and has implications for conspecific recognition. Funded by grants P51OD011107 and HD092055.