Individual voice recognition and an auditory map of neighbours in free-ranging black howler monkeys (Alouatta pigra)
Individual voice recognition and an auditory map of neighbours in free-ranging black howler monkeys (Alouatta pigra)
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DOI：
10.1007/s00265-014-1813-9
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发表时间：
2015-01-01
影响因子：
2.3
通讯作者：
Lemasson, Alban
中科院分区：
文献类型：
--
作者：
Briseno-Jaramillo, Margarita;Estrada, Alejandro;Lemasson, Alban
在听觉上确认个人，对于维持社会群体内同种个体之间的社会空间凝聚力以及规范邻居之间的空间使用具有首要重要性，特别是对于居住在视觉交流受限的森林中的物种而言。这项研究使用基于声音空间一致性的违反预期范式，评估了墨西哥帕伦克国家公园的黑吼猴(Alouatta Pgra)识别个别邻居声音的能力。首先，我们通过比较来自三个不同社会群体的六名成年男性大声叫声的声学结构，评估了个体内和个体间的声学差异。虽然树皮的声学结构比咆哮的声学结构更具个体区分能力，但这两种响亮的叫声类型都表现出显著的个体差异。其次，研究了由叫声和咆哮声组成的序列的回放，以评估六个相邻组的听觉识别能力。对每个研究组提出了两种测试情景：说话者的空间位置与语音广播一致(在适当的邻近领土上)或不一致(在对面领土上)。猴子在不一致的情况下反应明显更多(例如，更快的接近，更多的声音反应)。我们的数据表明，黑色咆哮猴表现出个体的声学变化，并能够识别非群体成员的声音。我们的实验范式是一种容易复制的方法，可以研究动物群体间的语音识别，并测试社会空间认知能力的程度。
Recognizing individuals auditorily is of primal importance in maintaining socio-spatial cohesion among conspecifics within a social group as well as for regulating space use among neighbours, particularly for species dwelling in forests where visual communication is constrained. This study evaluates the capacity of black howler monkeys (Alouatta pigra) in the Palenque National Park, Mexico, to recognize the voices of individual neighbours, using a violation-of-expectation paradigm based on the spatial congruence of voices. First, we assessed intra- vs inter-individual acoustic variations by comparing the acoustic structures of the loud calls of six adult males from three different social groups. Although the acoustic structures of barks were more individually discriminative than those of roars, both loud call types presented significant individual variations. Second, playbacks of sequences composed of barks and roars were studied in order to assess the auditory recognition capacity of six neighbouring groups. Two test situations were presented to each study group: the spatial location of the speaker was either congruent (in the appropriate neighbouring territory) or incongruent (in a territory on the opposite side) with the voice broadcast. Monkeys reacted significantly more (e.g. faster approach, more vocal responses) in incongruent situations. Our data suggest that black howler monkeys display individual acoustic variations and are capable of recognizing the voices of non-group members. Our experimental paradigm is an easily replicable way to investigate inter-group voice recognition in animals and to test the extent of socio-spatial cognitive abilities.