![]() ![]() Either, these are vocalizations of an overwintering different Bush Warbler, there is a cryptic taxon here different from Chinese thoracicus, or simply these are not yet the May-June spring songs. For some reason, none of the thoracicus recordings from India (Nepal, Assam) are of the 'typical type'. double buzz in smallest repeated unit, 1-2 for lower frequency of the buzz etc.), would lead to a similar total score of 4-5. An alternative, more pragmatic way of scoring (3 for single vs. Nevertheless, it is clear that the songs of both groups are different. It would seem that the aforementioned study suffered somewhat from small sample size of sound recordings, as reflected in Table 1 of the paper. This recording indeed nicely shows the 'doubled strophes' (with the first and second not identical, the second one having a longer buzz etc., which is different from the occasional 'double strophes' in thoracicus/przevalski ) We have only found one recording of kashmirensis. From these examples it would seem that the situation is somewhat less clear-cut, with strophes not necessarily being identical. ![]() #Type de strophes pdf#Some examples of song of thoracicus/przevalski (illustrated by multiple sonograms in the pdf version of this note): Typical song and less typical variations. Qualitatively, vocal difference lies mainly in the fact that thoracicus/przevalski has a repeated strophe which contains a single buzz, while kashmirensis has a repeated strophe which contains twice a buzz (Alström et al. Strict application of Tobias criteria based on the measurements in the paper would lead to score 3 for strophe length and score 2 for mean freq., resulting in a total score of 5. In any case, a score can only be given for either strophe length or pause duration). (Application of the term 'strophe' could be questioned, as it possibly leads to comparing not homologous parts of the song (1 phrase vs. Based on these data we can calculate effect sizes (ES) for thoracicus/przevalskii vs. (2008), and measurements of basic sound parameters are provided. Voice has already been extensively studied in Alström et al. We have made use of sound recordings available on-line from Xeno Canto (XC) and Macaulay Library (ML). (2010), as a support for taxonomic review. We also try to quantify the extent of any vocal differences using the criteria proposed by Tobias et al. ![]() In the following we briefly analyze and compare voice of the three races of Spotted Bush-warbler ( Bradypterus thoracicus). ![]()
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