Diurnal rhythm of activity in fresh-water mussel (Anodonta cygnea l.) under natural conditions

Salánki, János and Véró, Mihály (1969) Diurnal rhythm of activity in fresh-water mussel (Anodonta cygnea l.) under natural conditions. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 36. pp. 95-107. ISSN 0365-3005

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Abstract

From investigations on the periodic and rhythmical activity of Anodonta cygnea under natural conditions the following observations were made: 1. The duration of active periods is longer in the night than in daytime. 2. In the active periods the mean rhythmical activity and mean frequency are higher from 18 to 06 than from 06 to 18 hours. 3. In the daily fluctuation of valvular activity illumination seems to play a predominant role but the influence of other factors cannot be excluded. 4. Daily periodicity is not typical of the activity of freshwater mussel. Daily fluctuation of environmental factors synchronize to a certain extent the irregularly distributed activity of the adductor muscles determined by endogenous mechanisms.

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