Chemotesting Movements and Chemosensory Sensitivity to Amino Acids in the European Pond Turtle, Emys Orbicularis L.
The European pond turtle Emys orbicularis is an amphibious animal detecting and locating food by chemoreception both on land and in water (Honigmann, 1921). This turtle makes regular low-amplitude movements of the lower jaw that promote the propulsion of water to chemoreceptors within the nasal and oral cavities which may be regarded as stimulus acquisition behavior after the terminology of Atema (1987). de term these movements “jaw testing movements” (JTM). Various changes in the sensory medium and the animal’s emotional state elicit an increase of the JTM frequency which serves as an indicator of chemosensory perception of stimuli. In this study, we examined the reaction of Emys orbicularis to some L-amino acids. Such agents are effective stimuli for chemoreceptor3 of most aquatic animals and are generally found in the aquatic medium (Bardach, 1975).
KeywordsTest Stimulus Reproductive Behavior Stimulus Effect Differential Threshold Stimulus Concentration
Unable to display preview. Download preview PDF.
- Atema, J., 1987, Distribution of chemical stimuli, in: Sensory Biology of Aquatic Animals, J. Atema, R.R. Fay, A.N. Popper and W.H. Tavolga, eds, Springer-Verlag, New York.Google Scholar
- Bardach, J.E., 1975, Chemoreception of aquatic animals, in: Olfaction and Taste, Vol. V, D.A. Denton and J.P. Coghlan, eds., Academic Press, New York.Honigmann, H., 1921, Zur Biologie der Schildkrite, Biol. Zentralblatt, 41:241.Google Scholar
- Jorgensen, N.O.G., 1986, Fluxes of free amino acids in three Danish lakes, Freshwater Biol. 16: 255.Google Scholar
- Manteifel, Yu.B., and Boyko, V.P., 1987, Comparative evaluation of sensitivity of different chemoreceptor systems of Emys orbicularis, Sensory Systems 1:22 (in Russ.).Google Scholar
- Zygmuntova, J., 1972, Occurence of free amino acids in pond water, Acta hydrobiol. 14: 317.Google Scholar