Cross‐Sectional and Longitudinal Studies of the Development of Group Differences in Acoustic Features of Coo Calls in Two Groups of Japanese Macaques
Cross‐Sectional and Longitudinal Studies of the Development of Group Differences in Acoustic Features of Coo Calls in Two Groups of Japanese Macaques
复制标题
两组日本猕猴咕咕声声学特征群体差异发展的横断面和纵向研究
DOI：
10.1111/j.1439-0310.2006.01103.x
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发表时间：
2006
期刊：
影响因子：
1.7
通讯作者：
N. Masataka
中科院分区：
文献类型：
--
作者：
Toshiaki Tanaka;Hideki Sugiura;N. Masataka
日本猕猴（Macaca fuscata）经常发出咕咕声以保持声音联系。对黑斑雉、屋久岛和大平山两组的咕咕声发声声学特征进行横断面和纵向比较，探讨声音可塑性的可能性。这两个群体来自同一当地人口，但已分开超过 34 年。屋久岛组未配备，而大平山组则配备。最初，对两组 0 至 18 岁雌性的咕咕叫声进行了横断面比较。与屋久岛个体相比，大平山个体所有年龄组中研究的四个变量（开始频率、结束频率、最大频率和最小频率）的平均值始终较低。其次，对出生后1-4年内的个体进行纵向比较。与屋久岛个体相比，大平山所有年龄组中研究的五个频率变量（开始频率、结束频率、最大频率、最小频率和平均频率）的平均值再次始终低于屋久岛个体，尽管两组的平均值随着年龄的增加而逐渐下降。所有年龄段的最低频率以及第一年、第二年和第三年的起始频率的组间差异均显着。还对 4-11 个月大的个体进行了纵向比较。关于横断面研究中两组之间存在差异的四个变量，4-5 个月时两组之间的最低频率和起始频率平均值没有显着差异，但 7-8 个月和 9-11 个月的大平山个体显着较低。尽管供给可能对各组之间的体重差异产生影响，从而影响发声频率，但这些结果表明，由于声音可塑性，组间咕咕叫声特征的差异在出生后大约 6-7 个月形成。
Japanese macaques, Macaca fuscata, frequently utter coo calls to maintain vocal contact. Cross-sectional and longitudinal comparisons were conducted on the acoustic features of coo vocalizations of two groups of M. fuscata, Yakushima and Ohirayama groups, to explore the possibility of vocal plasticity. These two groups derive from the same local population but have been separated for more than 34 yr. The Yakushima group is non-provisioned, while the Ohirayama group is provisioned. Initially, coo calls in the two groups were compared cross-sectionally in females ranging from 0 to 18 yr. Mean values of the four variables studied (start, end, maximum, and minimum frequencies) were consistently lower in all age groups of the Ohirayama individuals compared with the Yakushima individuals. Secondly, longitudinal comparisons were conducted on individuals in the 1-4 yr after birth. Mean values of the five frequency variables studied (start, end, maximum, minimum and average frequencies) were again consistently lower in all age groups of Ohirayama compared with Yakushima individuals, although mean values of both groups gradually declined with an increase in age. Inter-group differences were significant at all ages in minimum frequency and at the first, second and third years in start frequency. Longitudinal comparisons of individuals aged 4-11 mo were also conducted. Regarding the four variables that differed between the two groups in the cross-sectional study, the mean values of minimum and start frequency did not differ significantly between the two groups at 4-5 mo, but were significantly lower in Ohirayama individuals aged 7-8 and 9-11 mo. Although provisioning may have had an effect on the weight difference between the groups, and consequently on vocalization frequency, these results suggest that the inter-group differences in coo call features form approximately 6-7 mo after birth as a result of vocal plasticity.