Behavior of toads, Bufo bufo, in a dynamic environment

Article type: Research Article

Authors: Lychakov, D.V.

Affiliations: Sechenov Institute of Evolutionary Physiology and Biochemistry of Russian Academy of Sciences, Thorez pr. 44, 194223, St. Petersburg, Russia. E-mail: [email protected]

Abstract: Susceptibility to motion sickness was tested by exposing free moving toads to rotation of a stimulator modeled after an amusement park Ferris Wheel. The stimulator provided a gentle stimulation of frequency 0.25 Hz and centrifugal acceleration 0.143 g during 120 min or more without external visual cues. No emetic or prodromal behavioral response was elicited during or after rotation. During rotation the amount of motor activity in most toads increased evidently. The most active toads attempted to climb out of the test chamber. It was inferred that experimental rotation was rather a stressful stimulus which initiated an escape response. In addition, during rotation the number of eye retractions and urination incidences increased, but appetite after rotation was inhibited. During rotation the motionless toads performed small regular head movements with period equal to rotation period of stimulator. These oscillations were probably vestibular (otolith) reaction to oscillating acceleration. The proposed resonance hypothesis gives a general idea of why lower vertebrates are immune to motion sickness.

Keywords: Nauseogenic dynamic environment, toad, low vertebrates, vestibular reaction, stress reactions

DOI: 10.3233/VES-2009-0355

Journal: Journal of Vestibular Research, vol. 19, no. 3-4, pp. 69-82, 2009