Comparative Data on the Trophic Spectrum of Syntopic [i]Bombina variegata[/i] and[i] Rana temporaria[/i] (Amphibia: Anura) Populations from the Iezer Mountains, Romania
Journal Title: Ecologia Balkanica - Year 2011, Vol 3, Issue 1
Abstract
In August 2009, we compared the trophic spectrum of syntopic [i]Bombina variegata[/i] and [i]Rana temporaria[/i] populations from the Bratia Valley in the Iezer Mountains. The separation of the trophic niche observed between the juveniles and the adults of [i]R. temporaria[/i] is caused by the differences in size between them, differences that influence their jump. The main consumed prey taxa by [i]Rana temporaria[/i] is represented by Arahnida, Gastropoda and Hymenoptera. Furthermore, the differences between the sizes of their mouths separate the trophic niche between the two species. Our results indicate a trophic selectiveness for B. variegata, which prefers ants. Despite the fact that the two species share the same habitat, the ants were consumed mostly by [i]B. variegata[/i]. This is probably a consequence of the fact that [i]B. variegata[/i] is a poisonous species, the toxins being able to originate from their preys – as are ants as well. The lack of competition for the two species indicates a rich trophic offer, enough to satisfy the energy needs of both species in contact in a limited space.
Authors and Affiliations
Sára Ferenți, Severus-D. Covaciu-Marcov
Keywords
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