Songs from these two subspecies are significantly different for 11 length, frequency and syllabic characteristics and principal components analysis separates their songs entirely. Type I songs seem to be absent from the study population during the winter. These results, when taken together with geographical and morphological evidence, suggest a great separation between Mangrove Warblers and Northern Yellow Warblers. A field test of Syrinx sound analysis software in interactive playback. Syrinx is a newly developed PC-based software package designed for interactive playback of animal vocalizations and for digital sound recording and sound analysis in the lab or in the field.
Syrinx permits flexible modeling of complex vocal interactions in an interactive playback setting.
Large numbers of sounds can be stored on disk as digital wave files for instant recall in the field. The playback trial timer and real-time scrolling spectrographic display of microphone input facilitate the tailoring of playback responses to subtle changes in the vocalizations of playback subjects. Seperate strategies with a common target. Patterns of divorce and extrapair mating can provide insights into the targets of female choice in free-living birds. In resident, site-faithful species with continuous parternships the better options and the incompatibility hypotheses provide the most likely explanations for divorce.