AVIS-IBIS

Birds of Indian Subcontinent

Diet of Common Ravens on El Hierro, Canary Islands (Dieta de Corvus corax en El Hierro, Islas Canarias)

Publication Type:Journal Article
Year of Publication:1997
Authors:Nogales, M, Hernández, EC
Journal:Journal of Field Ornithology
Volume:68
Issue:3
Date Published:1997
ISBN Number:02738570
Keywords:Corvidae, Corvus, Corvus corax, Fringillidae, Serinus, Serinus canaria
Abstract:The Common Raven (Corvus corax) on El Hierro, an oceanic island in the Canary archipelago, is omnivorous. Although ravens from five regions on El Hierro showed qualitatively similar diets, there were considerable quantitative differences. Diet in wet and dry pastureland was made up principally of animals: invertebrates at Jinama (frequency of occurrence in pellets = 84.8%) and high levels of vertebrates at Bascos (60%). Spring was characterized by the consumption of vertebrates (frequency in pellets = 48.5%), summer by invertebrates (77.1%), and autumn/winter by a diet of plant material (92.6% and 96.9%, respectively). While diets in many continental environments are often characterized by vertebrates throughout the year, ravens on El Hierro tend to be omnivorous, including many insects and wild fruits in their food. /// La dieta del cuervo (Corvus corax) en la isla de El Hierro, Islas Canarias, es omnívora. Aunque cinco zonas estudiadas no mostraron gran variación respecto al tipo de alimento, hubo considerables cambios cuantitativos. En los pastizales de Bascos (seco) y Jinama (húmedo) la dieta consistió básicamente de materia animal. Hubo invertebrados en abundancia en Jinama (frecuencia de aparición en egagrópilas = 84.8%) y restos de vertebrados en el de Bascos (60%). Desde el punto de vista estacional, la primavera se caracterizó por el consumo de vertebrados (frecuencia de aparición en egagrópilos = 48.5%), el verano por el consumo de invertebrados (77.1%), y durante el otoño y el invierno se alimentaron intensamente de materia vegetal (92.6% y 96.9%, respectivamente). Mientras la dieta del cuervo se caracteriza básicamente por la presencia de vertebrados en los ecosistemas continentales, en áreas insulares, como El Hierro, el ave es omnívora, incluyendo en su dieta abundantes insectos y materia vegetal.
URL:http://www.jstor.org/stable/4514241
Short Title:Journal of Field Ornithology
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