CECOAL   02625
CENTRO DE ECOLOGIA APLICADA DEL LITORAL
Unidad Ejecutora - UE
artículos
Título:
Alimentación de dos especies de anfibios (Anura: Hylidae) en la estación de bajas temperaturas y su relación con la acumulación de energía en Santa Fe, Argentina
Autor/es:
CAROLINA ELIZABETH ANTONIAZZI; JAVIER ALEJANDRO LÓPEZ; MARTA DURÉ; FALICO D.A.
Revista:
REVISTA DE BIOLOGÃA TROPICAL
Editorial:
REVISTA DE BIOLOGIA TROPICAL
Referencias:
Lugar: Turrialba; Año: 2013 vol. 61 p. 875 - 886
ISSN:
0034-7744
Resumen:
Abstract: Feeding of two amphibian species (Anura: Hylidae) during the low temperatures season and its
relationship with energy storage in Santa Fe, Argentina. In environments with thermal and pluvial seasonality
such as those of the Middle Paraná River floodplain (Province of Santa Fe, Argentina), most amphibian
species reproduce during the warm season and drastically diminish their activity during winter. Even though, a
few species remain active during the cold season, such as Hypsiboas pulchellus that has its reproductive peak
during the autumn-winter period (and the consequent energy demand). The objective of this study was to analyze
and compare the feeding and development of fat bodies during the low temperature season for H. pulchellus
and Dendropsophus nanus. We analyzed entire gastrointestinal tract contents of both species (H. pulchellus=110
specimens; D. nanus=114 specimens) and applied an index (IRI%) that combines prey abundance, volume and
frequency to describe frogs diets; we used fat bodies weights as indicators of stored energy reserves. We compared
diet between species with a niche overlap index (Ojk: 0-1) and used null models to ascribe statistical significance
to evaluate overlap; and we analyzed variation in empty guts proportions through months and between
species. Also, using ANCOVAs we explored differences in fat bodies, number and volume of prey consumed
along months, between species and sexes. The most important preys in H. pulchellus diet during the cold season
were Araneae (IRI%=34.96), Chironomidae (IRI%=33.08), Tipulidae (IRI%=11.44) and Gryllidae (IRI%=7.31);
while for D. nanus, Chironomidae (IRI%=48.14), Tipulidae (IRI%=18.41), Psychodidae (IRI%=7.44) and
Araneae (IRI%=7.34). Diet overlap between species was elevated (Ojk=0.78) and higher than expected by
chance (mean simulated indices: Ojk=0.04; p[observed≥expected]