Analisi preliminare dei parametri acusti temporali e spettrali di emissioni sonore di Marmota marmota. Preliminary analysis of the temporal and spectral acoustic parameters of Marmota marmota sound emissions [Analyse préliminaire des paramètres temporels et spectraux des émissions sonores de M. marmota].

Résumé

Vocalisations of marmots (Marmota marmota) of different colonies of two valleys of the Western Alpes have been analyzed. The vocal emissions were recorded lying in wait, under natural conditions, and also after artificial stimulations (realising moulds of birds, volontary presence of humans carring lights and providing the capture of two animals). The physical analysis of the vocalisations permitted to releave at least 4 different types of emissions: Single Whistles and Multiple Whistles, Single and Multiple Squeaks, Growls and Screams (emissed during capture). The emissions were analyzed in their temporal and spectral caracters, and from the analysis it results that whilst the whistles and squeaks have harmonic structure with discrete spectral components added to components of low or null noise level, the screams and growls are polluted by noise, produced by the subject, in high level besides which consents the finding of the harmonic structure. Such a difference is analysed from a semantic point of view.