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Información del Artículo

Título:
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Patterns of prey abundance and used by male and female Puerto Rican Sharp-shinned Hawks
Autores:
En: CARIBBEAN JOURNAL OF SCIENCE, 35 (1-2) Jun. 1999: 38-45. bibl. tablas. gráf.
Revista: Caribbean journal of science, vol. 35, núm. 1-2; June 1999
Resumen: Male Puerto Rican Sharp-shinned Hawks (Accipiter striatus venator Wetmore) are smaller than females, with a size difference of 23, 34, and 25%, in bill size, tarsus lenght, and body mass, respectively. We studied prey availability and diet delivered to nests of this highly dimorphic species in the Maricao Commonwealth Forest of Puerto Rico from 1978 to 1982. Thirty-one potential avian prey species (200 grams or less) were recorded at a density of 66.7 individuals/ha and a biomass of 1550 g/ha. Forty-five percent of available prey were used by hawks. Males captured ten prey species that ranged from 3 to 36.1 g, while females captured seven prey species that ranged from 8 to 180 g. The average prey size of males was significantly smaller (12.6 g) than that of females (45.2 g). The sexes overlapped in three prey species: the Puerto Rican Tanager (Nesospingus speculiferus (Lawrence)), Bananaquit (Coereba flaveola (Bryant)), and the Elfin Woods Warbler (Dendroica angelae Kepler and Parkes). The joint use of these prey weighted against their abundance showed a moderate overlap value of 0.36. four of the ten bird species delivered by males accounted for 89% of prey numbers and 92% of pray biomass, and four of the seven prey species delivered by females accounted for 82%of prey numbers and 76% of prey biomass. The view that sexual dimorphism results in differential prey selection is supported by this study, but the prediction that the larger females should feed on a wider range of prey in relation to the smaller male is not. In contrast to populations in Oregon, U.S.A., Puerto Rican Sharp-shinned Hawks have a narrower diet breadth, possibly because prey abundance exceeds demand and the absence of congeneric competition.
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