Contributions to the problem of daily rhythm in the activity of the fresh water mussel Anodonta cygnea L.

Salánki, János (1964) Contributions to the problem of daily rhythm in the activity of the fresh water mussel Anodonta cygnea L. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 31. pp. 109-116. ISSN 0365-3005

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Abstract

We investigated in Anodonta cygnea L. the daily fluctuations of the rhythmic activity (quick contractions of the adductor muscle) and of the periodic activity (transition to rest from activity and reversely) under laboratory conditions. We found the rhythmic activity compared to the other three periods to increase in the 2 nd period of the day (from 6-12 hours). Simultaneously the values of the transitions from activity to rest are also the highest between 6-12 hours. The beginning of the new active period is the most frequent in the third period of the day. The results were the same on rest days, when the laboratory was practically “noiseless”. The daily fluctuations are supposed to origin in the fluctuations oi the illuminations and in the water temperature. The observed daily rhythm does not play determining role in the rhythmic and periodic activity of the fresh water mussel, but influences to a certain degree the daily distribution of them.

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