Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 1 de 1
Filtrar
Más filtros











Base de datos
Intervalo de año de publicación
1.
Science ; 287(5457): 1482-5, 2000 Feb 25.
Artículo en Inglés | MEDLINE | ID: mdl-10688796

RESUMEN

The evolutionary causes of small clutch sizes in tropical and Southern Hemisphere regions are poorly understood. Alexander Skutch proposed 50 years ago that higher nest predation in the south constrains the rate at which parent birds can deliver food to young and thereby constrains clutch size by limiting the number of young that parents can feed. This hypothesis for explaining differences in clutch size and parental behaviors between latitudes has remained untested. Here, a detailed study of bird species in Arizona and Argentina shows that Skutch's hypothesis explains clutch size variation within North and South America. However, neither Skutch's hypothesis nor two major alternatives explain differences between latitudes.


Asunto(s)
Conducta Animal , Conducta Alimentaria , Conducta Predatoria , Pájaros Cantores/fisiología , Animales , Argentina , Arizona , Femenino , Geografía , Masculino , Conducta Materna , América del Norte , Conducta Paterna , Filogenia , América del Sur
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA