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ABSTRACT. Mechanisms used by birds to range their distance from singing conspecifics are being debated. In particular, the idea that an incoming song must be in a bird's repertoire for it to be ranged accurately is controversial, but important to our appreciation of the role ranging plays in song evolution. We tested the relation between ranging accuracy and songs in repertoires in playback experiments to male Blue-headed Vireos ( Vireo solitarius) whose precise locations were known because they were incubating eggs. Males ranged songs heard while incubating and, when their mates relieved them at the nest, flew directly to the silent playback sites, suggesting that they remembered the locations of simulated intruders. Male vireos approached playback sites of local songs, likely in their own repertoires, more precisely than foreign songs recorded 95•645 km from our study site. Songs included in local and foreign playback tapes differed primarily in frequency modulation, but were similar in other measurements. These results support ranging theory as described by . If the songs within an individual s repertoire are ranged with greater accuracy, we discuss how the stability of neighborhoods becomes a factor as to whether or not selection will favor repertoire sharing in song evolution. As well, singing style is affected by ranging. Because Blue-headed Vireos present their songs in a stereotyped order, a listener can compare ordered sequential changes in signal degradation. Comparing degradation in a sequence of songs adds a temporal element that should result in more accurate ranging of the singer's location. SINOPSIS. Determinación de la distancia de cantos durante el periodo de incubación en Vireo solitarius: la importancia del repertorio de cantos y sus implicaciones en el patrón de exposición y poder discriminar entre cantos locales o dialectos Los mecanismos utilizados por las aves para determinar la distancia de canto de otros individuos están siendo debatidos. La idea de que la canción debe estar en el repertorio del recipiente para que sea arreglada con exactitud, es controversial, pero importante para poder entender la evolución del canto. Tratamos de probar la relación entre la tasa de exactitud y el repertorio de cantos utilizados. Para estos se exposo, a grabaciones de cantos, a individuos de Vireo solitarius cuya localización se sabía con exactitud dado el caso de que dichos individuos estaban incubando. Los machos pudieron dar con la localización del sonido y cuando los hembras los relevaron, volaron directamente hacia el lugar en donde se había puesto la grabación. Esto sugiere que recordaron la localidad desde donde se transmitió el sonido. Los machos se acercaron a las grabaciones de canciones locales (que se encontraban en su propio repertorio), de forma más precisa que las grabaciones de aves extrañas o con otros dialectos. Si los cantos del repertorio de un individuo, son arreglados con gran exactitud, entonces la estabilidad de los cantos de los vecinos va ser un factor, no importa si la selecci...
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