Data to the chemical sensitivity of freshwater mussel (Anodonta cygnea L.)

Lukacsovics, Ferenc and Salánki, János (1968) Data to the chemical sensitivity of freshwater mussel (Anodonta cygnea L.). A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 35. pp. 25-34. ISSN 0365-3005

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Abstract

Examining the responsiveness of Anodonta to various salts it was established: 1. The outflow syphon responded to the least effective concentration of the stimulatory chemical agent tested. Closure of the valves (contraction of adductors) was produced by stimuli of sufficient intensity. 2. The order of the cations on basis of closure of inflow syphon was: К > Cd > Ca > Mg > NH₄ > Na. 3. This order changed slightly with regard to concentrations producing closure of the valves: К > Cd > NH₄ > Mg > Ca > Na. 4. A surprisingly great difference was observed between threshold concentration and concentrations producing the highest possible response in the case of the cations K, Ca and Cd, which might give an explanation to the high concentration dependency of the effect of К and Cd on the rhythmic and periodic activity. 5. It is assumable th a t the receptor zone of the syphons might considerably influence the central mechanism of activity regulation.

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