INVESTIGADORES
DURE PITTERI marta Ines
artículos
Título:
TROPHIC AND MICROHABITAT NICHE OVERLAP IN TWO SYMPATRIC DENDROBATIDS FROM LA SELVA, COSTA RICA
Autor/es:
CAJADE, R.; SCHAEFER, E. F.; DURÉ, M. I.; KEHR, A. I.
Revista:
CUADERNOS DE HERPETOLOGÃA
Editorial:
ASOCIACIÓN HERPETOLÓGICA ARGENTINA
Referencias:
Lugar: Tucumán; Año: 2010 vol. 24 p. 81 - 92
ISSN:
0326-551X
Resumen:
We studied the trophic ecology of Dendrobates auratus and Oophaga
pumilio in La Selva Biological Station, Costa Rica. At this site, both dendrobatids are sympatric
due to the introduction and naturalization of D. auratus in the last 24 years. Diets of both
dendrobatids were recorded by the analysed stomach flushing technique. Microhabitats uses
were defined as the site where each individual was captured. The influence of microhabitat on
diets was evaluated by the dietary (prey proportions and volume) and microhabitat overlaps
using Piankas (Ojk) overlap index calculated with EcoSim software. Diets of both dendrobatids
were principally characterized by the preference of hymenopterans (ants), acarines and
collembolans, resulted in a high overlapping in prey proportions and prey volume. However,
diets overlaps were not significant, suggesting the absence of negative feeding interactions.
Microhabitat use was low overlapped and also not significant, suggesting a differentiation on the
use of spatial resource. The absence of negative feeding interactions between Dendrobates
auratus and Oophaga pumilio could be due to segregation in microhabitat use and possible by
the abundance of trophic resource in the area. The great large volumes of formicids and
acarines in the diet of this dendrobatids are in agreement with the hypothesis of these
arthropods as a dietary source of alkaloids.