Seasonal Patterns of Song Structure Variation in a Suboscine Passerine

摘要: Abstract Studies of song and its function in suboscine passerines are rare. We examined spatial temporal variation structure a wild population Olive-sided Flycatchers (Contopus cooperi) tested among hypotheses explaining this variation. Repeatable type was observed both within individuals. More than 10% territorial males expressed atypical types, i.e., permutations sequential missing repeated elements the typical adult song. Atypical songs were predominantly by unpaired independent habitat type. A small fraction sang through middle breeding season, but all only stereotypical end season. These results suggest expression reflect protracted vocal development rather evolution new geographic structure, or an extensive repertoire Flycatchers.