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Título: Effects of prey size and foraging mode the ontogenic change in the feeding niche of Colostethus stepheni (Anura-dendrobatidae)
Autor(es): Moreira G
Albertina Pimentel Lima
Assunto: Amphibia
ISSN: 0029-8549
Revista: Oecologia
Volume: 95
Resumo: The feeding niche of Colostethus stepheni changes during ontogeny. Small individuals eat small arthropods, principally mites and collembolans, and larger frogs eat bigger prey of other types. The shift in prey types is not a passive effect of selection for bigger prey. There is a strong relationship between electivity for prey types and frog size, independent of electivity for prey size. Four indices of general activity during foraging (number of movements, velocity, total area utilized and time spent moving), which are associated with electivity for prey types in adult frogs and lizards, did not predict the ontogenetic change in the diet of C. stepheni. Apparently, the behavioral changes that cause the ontogenetic change in C. stepheni are more subtle than shifts in general activity during foraging. Studies of niche partitioning in communities of anurans that do not take into consideration ontogenetic changes in diet and seasonal changes in the size structures of populations present a partial and possibly erroneous picture of the potential interactions among species.
ISSN: 0029-8549
Local de publicação: Alemanha
Aparece nas coleções:Coordenação de Biodiversidade (CBIO)

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