Author(s): Tolojanahary N L Fatroandria, Noromalala R Rasoamampionona, David R Vieites, Miguel Vences
Stomach contents from 190 specimens of the Malagasy grass frog, Ptychadena mascareniensis, from rice fields near Ranomafana National Park were obtained by stomach flushing. Contents comprised 404 identifiable prey items, mainly arthropods. This species is a generalist that feeds on a variety of prey. The most common prey were coleopterans and ants (16.2% each), orthopterans (13.4%), spiders (11.7%), insect larvae (7.5%), and hemipterans (5.4%). This study reveals the presence of one metamorphosing froglet among the prey, which might indicate cannibalism although it was not possible to identify to which species it belonged. Female P. mascareniensis are significantly larger than males but consume a similar number of prey. We observed a positive correlation between prey size and frog size, and a significant negative correlation between number and size of prey ingested.