Individual'naya izmenouivosti zvoukogo predupreïdayuzhego ob opasnosti signala stepnogo sourka [Variabilité individuelle du cri d'alarme de la marmotte des steppes. Individual variation of the alarm call of Marmota bobac].

Résumé

Alarm call of adult marmots was recorded in the field by tape-recorder. Near by the Shilovka, (8 individuals) and the Surulovka (4 individuals) villages (U I janovsk district) were the sites of our work. Sonograms of the vocal signals were obtained by the Computer Sona-Graph in the Humboldt-Universitat zü Berlin we used discriminant method for statistical analysis. As a variable was taken the frequency coordinate with time interval of 20 ms. From each note (high frequency component only, "pee"-sound, but"qu"-sound is not). 5 variables were obtained (80 ms) : 0 ms, 20 ms, 40 ms, 60 ms, 80 ms, 10 sounds were obtained from each individuals. The preliminary analysis has revealed discriminate between the populations Shilovka-Surulovka. On these grounds we analyzed these populations separately. The discriminate analysis revealed high stability of the individual characteristics of the signal (90%- 100% classification within individuals). See the discriminate analysis diagrams in Russian (p. 23).