INVESTIGADORES
VAIRA Marcos
artículos
Título:
Vulnerability of Pleurodema borellii tadpoles to an avian predator. Effect of size and density
Autor/es:
CRUMP, MARTHA L.; VAIRA, MARCOS
Revista:
HERPETOLOGICA
Editorial:
Herpetologists' League
Referencias:
Año: 1991 vol. 47 p. 316 - 316
ISSN:
0018-0831
Resumen:
Previous studies have identified two phases of a tadpole’s development during which selection should favor rapid growth and development: (1) small young stages and (2) metamorphic stages. However, no previous study has examined size selectivity of tadpoles by large vertebrate predators, such as a bird. In a series of field experiments using free-ranging great kiskadees (Pitangus sulphuratus) and four size classes of tadpoles of Pleurodema borellii, we documented that the bird greatly preferred the larger of two classes of tadpoles offered in a pairwise combinations. Given a choice between two densities of tadpoles, great kiskadees prefered to forage where density was higher. At both densities of tadpoles, the birds chose primarily the larger tadpoles