La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Common Loons can differentiate yodels of neighboring and non-neighboring conspecifics
Auteurs :	John N. Mager, Auteur ; Charles Walcott, Auteur ; Walter H. Piper, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (81(4) DEC 2010)
Article en page(s) :	392-401
Langues:	Anglais
Résumé :	Although previous studies have identified elements of the yodel calls of male Common Loons (Gavia immer) that might be important for neighbor/non-neighbor discrimination, no one to date has determined whether loons can distinguish between the yodels of neighbors and non-neighbors. Our objectives were to determine if Common Loons respond differently to playback recordings of yodels of neighbor and non-neighbors and, if so, if elements of the introductory phrase or the repeat phrases are important in such differentiation. We studied loons occupying single-lake territories in Oneida County, Wisconsin, in 2001 (N = 20 pairs) and 2007 (N = 16 pairs). Playback experiments revealed no significant difference in number of different types of vocalizations (yodels, tremolos, and wails) loons gave in response to neighbor and non-neighbor yodels. However, loons gave significantly more tremolos in response to yodels lower in peak frequency than those of resident male (P = 0.01), indicating they were more threatened by such calls. In addition, loons gave significantly more tremolos (P

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