G. S. Surovaa, T. V. Mukhinab, and D. V. Bezryadnovb
aMoscow State University, Moscow, 119992 Russia
e-mail: surova@hotbox.ru
bAnokhin Research Institute of Normal Physiology, Russian Academy of Medical Sciences,
ul. Mokhovaya 11/4, Moscow, 125009 Russia
e-mail: bezriadnov@yahoo.com
Received March 6, 2008
Abstract—Different components of group effect on the locomotor activity of single common toad and brown
frog tadpoles have been studied by estimating the length of their trajectories, the speed of movement, the num-
ber of crossings of experimental field zones, and the number and duration of stops. The results show that toad
tadpoles are more active than frog tadpoles. Conspecific metabolites added to the water do not change the pat-
tern of their locomotor activity. Under conditions of visual contact with other tadpoles, locomotor activity of a
toad tadpole decreases, whereas that of a frog tadpole increases. Thus, tadpoles of the two amphibian species
show species-specific behavioral responses to changes in experimental conditions.
DOI: 10.1134/S1067413609040092
Key words: Anura, tadpoles, interactions, group effect.
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