Coding of chemosensory information by the nervous system ofDaphnia magna andEnchytraeus albidus under conditions of action of high environmental temperature

Chemical stimuli (glutamate, glycine, cAMP, and AMP) cause slow and pronounced changes in thermostability of the organisms ofDaphnia magna andEnchytraeus albidus, which can be explained by functioning of not adapted or partially adapted chemoreceptive cells. In experiments with action of purines on the thermostability, the presence inE. albidus of two different chemoreceptors, specific accordingly to cAMP and non-cyclic purines, is shown. A complex extremal stimulus—reaction function, with several optimal values of intensity of the chemical stimulus, at its action on theD. magna andE. albidus thermostability, shows that the elements (neurons or their systems) with the extremal input-output function take part in coding the chemosensory information by the nervous system of these animals.