The role of environmental temperature and pH on the variations in K⁺- and tryptamine-sensitivity of glochidia of Anodonta cygnea L.

Lábos, Elemér and Lukacsovics, Ferenc (1968) The role of environmental temperature and pH on the variations in K⁺- and tryptamine-sensitivity of glochidia of Anodonta cygnea L. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 35. pp. 13-24. ISSN 0365-3005

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Abstract

An experimental analysis on K⁺ - and tryptamine-sensitivities of rhythmic and tonic adductor-response in Anodonta-larvae was made and their dependence from temperature, osmotic and pH-changes was investigated. The low value of К⁺-sensitivity in October is supposed to be in connection with the osmotic immaturity of the larvae; the higher sensitivity found in distillated water was attributed to the absence of antagonistic ions while the sensitivity-decrease in spring to the changes of Balaton-water. The possibility of a change of ontogenetic character can not be excluded in the decrease of tryptamine response in spring. In distillated water no tryptamine response was found while there is a high K⁻ response. For the pH-depence of the responses it is characteristic that 1. the K⁺-tone increases in general with pH between 6 and 9; a pH < 6 again — decreases the tone, 2. the tryptamine-rhythm in case of a corresponding buffer — is pronounced with an alkalinic value of pH, but it is very low with a neutral pH. In the case of К⁺-response the importance of temperature adaptation was demonstrated. The cold-adapted animals give a less tonic response with a rhythm of higher frequency. The animals are capable to response for 11 days a t temperatures of 6 10 °C, and for 4 days a t temperatures of 20-25 °C. The jumps in temperature are of a sensitivity-decreasing effect.

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