A. N. Severtsov Institute of Problems of Ecology and Evolution, Russian Academy of Science, Leninsky prospekt 33, Moscow 117071, Russia

Abstract

The Rana arvalis tadpoles at 27-40 stages responsed to solution of some L-amino acids inconcentration 10-2 mol/l with feeding reactions. The range of perceptible amino acids increased duringdevelopment from 10 to 16. The best feeding stimuli were aspartic and glutamic acids; iminoacids(proline and oxyproline), metionine, leucine and isoleucine did not evoke the significant reactions.The sensitivity to some amino acids (alanine, glutamine, lysine, ornitine, proline and valine) was10-5-10-4 mol/l at earlier stages and increased to 10-6-10-5 mol/l during larval ontogenesis.