INVESTIGADORES
PALACIOS Maria Gabriela
artículos
Título:
Can beak size affect the acoustic frequecies in the woodcreepers (Dendrocolaptinae)?
Autor/es:
PALACIOS M. G.; TUBARO, P. L.
Revista:
THE CONDOR
Editorial:
COOPER ORNITHOLOGICAL SOC
Referencias:
Año: 2000 vol. 102 p. 553 - 560
ISSN:
0010-5422
Resumen:
We assessed the effect of beak morphology on the acoustic structure of woodcreeper (subfamily Dendrocolaptinae) songs using a comparative analysis of independent contrasts. For the song of each species, we measured the maximum and minimum frequencies, the bandwidth, and the emphasized frequency. Residuals of variation in beak length and acoustic frequencies after controlling for body size and phylogeny were calculated for each species and compared. We found a negative relationship between the residuals of acoustic frequencies and the residuals of beak length. This relationship was significant for emphasized frequency when we excluded two open-habitat species, Scimitar-billed Woodcreeper (Drymornis bridgesii) and Narrow-billed Woodcreeper (Lepidocolaptes angustirostris). This result is consistent with the hypothesis that the suprasyringeal vocal tract has resonating properties that affect the frequency spectrum of the song.