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© 1997 International Society for Behavioral Ecology
research-article |
Honest advertisement and song output during the dawn chorus of black-capped chickadees
Department of Biology, Queen's University Kingston, Ontario, Canada K7L 3N6
ABSTRACT
Costly signals can evolve under sexual selection, as only those signals that are difficult to produce and reflect the relative quality of individuals should be important in mate choice. One such signal may be dawn singing behavior in birds. We assessed whether the song output at dawn of breeding male black-capped chickadees Parus atricapilhis honestly reflects quality, where relative quality is assessed by relative dominance rank in winter flocks. Dawn choruses were recorded from 20 male chickadees from 10 flocks during the fertile period of their mates in 1992, 1994, and 1995. Dominance ranks of males were assessed by tabulating interactions at winter feeders from 1993 to 1995. A comparison of the dawn singing behavior of the high-ranking and the low-ranking males from each of the 10 flocks showed that high-ranking males began singing earlier, sang longer, and sang at higher average and maximum rates than low-ranking flockmates. Age of the males had less effect on song output at dawn than rank; older males tended to sing longer dawn choruses, but there was no difference in onset of singing, average song rate, or maximum song rate at dawn between hatch year and after-hatch year males. Our findings suggest the dawn chorus can provide an accurate signal to females of the relative quality of their mate compared to neighboring males
Key words: Black-capped chickadee, dawn chorus, honest advertisement, Parus atricapillus, song.
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