Portal de Periódicos da CAPES

TEMPORAL PATTERNS OF SINGING ACTIVITY AT LEKS OF THE WHITE-BELLIED EMERALD

1991; Wilson Ornithological Society; Volume: 103; Issue: 3 Linguagem: Inglês

1938-5447

Jonathan L. Atwood, Lidia Vanessa, Jennifer E. Bamesberger,

Animal Vocal Communication and Behavior

Ass’ra.4c-r.-The White-bellied Emerald (Amaziliu candida), a sexually monomorphic, dull-plumaged hummingbird, forms singing assemblies that are assumed to function as leks. Within each lek, individuals use and defend specific display perches throughout the day. These perches are visually isolated from one another, and song is the principal form of display. Although some song is given throughout the day, peak activity occurs during the first hour of daylight; a second, more protracted period of display occurs during the 3 hours preceding sunset. The number of songs given by individuals is positively correlated with the number of birds present on the lek, and individuals that are consistently present throughout the day sing more songs when present than do birds that attend the lek only sporadically. Received 5 Sept. 1990, accepted 19 March 1991. REsuMEN.-Amazilia Pechiblanca, un colibri de plumaje apagado y sin diferenciacion sexual, se congrega en formaciones de canto que se asume tienen funciones reproductivas (asambleas reproductivas 6 “leks”). Dentro de cada una de estas asambleas reproductivas, 10s individuos utilizan y defienden perchas especificas a lo largo de1 dia. Estas perchas estan aisladas visualmente las unas de las otras, y el canto es la forma principal de exhibition. Aunque cantos aislados ocurren durante el dia, la actividad maxima occure durante la primera hora de luz en la maiiana; un Segundo period0 de actividad ocurre durante las 3 horas previas a la puesta de1 sol. El numero de cantos que cada individuo exhibe e& positivamente correlacionado con el nimero de aves presentes en cada una de estas asambleas reproductivas, y 10s individuos que estln presentes en estas asambleas reproductivas en forma constante cantan mas que 10s individuos que estan presentes solo en forma esporadica.