Paola Laiolo i col.laboradors mesurant el crit de les Terreroles rogenques (Calandrella rufescens) quan fugen d’un depredador han descobert que el so és més aspre en individus en una millor condició física. Això suggereix que el crit d’alarma podria servir de senyal honesta cap al depredador que, al sentir-lo, desistiria d’intentar capturar a aquells ocells amb un crit d’alarma més potent.
Per la seva banda, Christopher N. Templeton &co. han estudiat el crit d’alarma d’unes mallerengues americanes (Poecile atricapilla) quan van en grup. Ja se sabia que el crit ‘sit’ l’emeten quan es veuen atacades per un depredador que ve volant i que el crit ‘xic-a-di’ l’utilitzen per reclutar altres individus per fer “mobbing” a un depredador posat. El que han descobert ara és que petits matisos del crit ‘xic-a-di’ informen a la resta del grup del grau de perillositat del depredador.
> Laiolo, P., Tella, J.L., Carrete, M., Serrano, D. i López, G. (2004) Distress calls may honestly signal bird quality to predators. Proc. R. Soc. Lond B (Suppl.) 271: S513-S515.
> Templeton, C.N. Greene, E. I Davis, K. (2005) Allometry of alarm calls: black-capped chickadees encode information about predator size. Science 308: 1934-1937.
Foto (crits de fugida analitzats per Laiolo) cortesia de Paola Laiolo
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Las aves no gritan de cualquier manera
Paola Laiolo y colaboradores, midiendo el grito de las terreras marismeñas (Calandrella rufescens) mientras huyen de un depredador, han descubierto que el sonido es más áspero en individuos que se encuentran en una mejor condición física. Esto sugiere que el grito de alarma podría servir de señal honesta hacia el depredador que, al sentirlo, desistiría de intentar capturar a aquellos pájaros con un grito de alarma más potente.
Por su parte, Christopher N. Templeton &co. han estudiado el grito de alarma de unos herrerillos americanos (Poecile atricapilla) cuando van en grupo. Ya se sabía que el grito 'sit' lo emiten cuando se ven atacados por un depredador que viene volando y que el grito 'xic-a-di' lo utilizan para reclutar a otros individuos para hacer "mobbing" a un depredador posado. Lo que han descubierto ahora es que pequeños matices del grito 'xic-a-di' informan al resto del grupo del grado de peligrosidad del depredador.
> Laiolo, P., Tella, J.L., Carrete, M., Serrano, D. i López, G. (2004) Distress calls may honestly signal bird quality to predators. Proc. R. Soc. Lond B (Suppl.) 271: S513-S515. > Templeton, C.N. Greene, E. I Davis, K. (2005) Allometry of alarm calls: black-capped chickadees encode information about predator size. Science 308: 1934-1937.
Fotos (gritos de hudia analizados por Laiolo) cortesía de Paola Laiolo
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see Older News on the left-hand column
see Older News on the left-hand column
Saturday, 6 December 2008
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