Individuality in the vocalizations of infant and adult coppery titi monkeys (Plecturocebus cupreus).,American Journal of Primatology

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Individuality in the vocalizations of infant and adult coppery titi monkeys (Plecturocebus cupreus).
American Journal of Primatology ( IF 2.0 ) Pub Date : 2020-04-16 , DOI: 10.1002/ajp.23134
Allison R Lau _{1,

2} , Dena J Clink ₃ , Karen L Bales _{1,

2,

4}

Affiliation

As social animals, many primates use acoustic communication to maintain relationships. Vocal individuality has been documented in a diverse range of primate species and call types, many of which have presumably different functions. Auditory recognition of one's neighbors may confer a selective advantage if identifying conspecifics decreases the need to participate in costly territorial behaviors. Alternatively, vocal individuality may be nonadaptive and the result of a unique combination of genetics and environment. Pair-bonded primates, in particular, often participate in coordinated vocal duets that can be heard over long distances by neighboring conspecifics. In contrast to adult calls, infant vocalizations are short-range and used for intragroup communication. Here, we provide two separate but complementary analyses of vocal individuality in distinct call types of coppery titi monkeys (Plecturocebus cupreus) to test whether individuality occurs in call types from animals of different age classes with presumably different functions. We analyzed 600 trill vocalizations from 30 infants and 169 pulse-chirp duet vocalizations from 30 adult titi monkeys. We predicted that duet contributions would exhibit a higher degree of individuality than infant trills, given their assumed function for long-distance, intergroup communication. We estimated 7 features from infant trills and 16 features from spectrograms of adult pulse-chirps, then used discriminant function analysis with leave-one-out cross-validation to classify individuals. We correctly classified infants with 48% accuracy and adults with 83% accuracy. To further investigate variance in call features, we used a multivariate variance components model to estimate variance partitioning in features across two levels: within- and between-individuals. Between-individual variance was the most important source of variance for all features in adults, and three of four features in infants. We show that pulse-chirps of adult titi monkey duets are individually distinct, and infant trills are less individually distinct, which may be due to the different functions of the vocalizations.

中文翻译：

婴儿和成年铜犀鸟（Plecturocebus cupreus）发声中的个性。

作为社交动物，许多灵长类动物都使用声音交流来维持关系。语音个性已被记录在各种各样的灵长类物种和呼叫类型中，其中许多可能具有不同的功能。如果识别特定物种减少了参与昂贵的领土行为的需要，对邻居的听觉识别可能会带来选择优势。或者，声音的个性可能不适应，是遗传学和环境独特结合的结果。尤其是成对键合的灵长类动物经常参加协调的人声二重唱，相邻的同伴可以在很长的距离上听到它们。与成人通话相反，婴儿发声是短距离的，用于组内交流。这里，我们提供了两种单独但互补的分析方法，用于分析铜制山雀猴（Plecturocebus cupreus）不同呼叫类型的声音个性，以测试个性不同功能的不同年龄类动物的呼叫类型是否存在个性。我们分析了30例婴儿的600颤音发声和30只成年titi猴子的169 pulse声二重奏发声。我们预测，鉴于二重唱贡献在长距离，群体间交流中发挥的作用，其将比婴儿琐事表现出更高的个性。我们估计了来自婴儿颤音的7个特征和来自成人脉pulse的频谱图的16个特征，然后使用判别函数分析和留一法交叉验证对个体进行分类。我们将48％的准确度的婴儿和83％的准确度的成人正确分类。为了进一步研究通话特征中的方差，我们使用了一个多元方差成分模型来估计特征在两个层次上的差异分区：个体内部和个体之间。个体之间的差异是成人所有特征以及婴儿四个特征中的三个特征最重要的变异来源。我们显示成年titi猴子二重唱的脉冲pulse是个别不同的，而婴儿的莳萝不是那么个别，这可能是由于发声的不同功能。

更新日期：2020-04-16

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