Spécificité spécifique et parallélismes interspécifiques du cri d'alarme chez les marmottes eurasiennes]. Species specificity and interspecies parallelisms of alarm call in Eurasian Marmots.

Résumé

The alarm call of Eurasian Marmots was tape-recorded in field condition. The dynamic spectrum (sonograms) is species specific whereas the rhythmic organization is not. The rhythmic organization corresponding to the landscape relief manifests the interspecies parallelisms and intraspecies divergence. The increase of the vertical division of the relief is accompanied by reduction of the periods of pulse recurrence. The analysis of dynamic spectra suggests that M. caudata and M. menzbieri were isolated earlier than other species. The alarm call dynamic spectrum in M. camtschatica has intermediate features between those of Eurasian and American species. The interspecific variability of the structure of alarm call in M. sibirica, M. baibacina and M. bobac bears the character of stepped cline. The signal these three species ("group bobac") has similar low-frequency component. M. marmota signal is more similar by its structure to the signal of american species.