Chemo-ecological relationship between some fish species in Lake Balaton and the glochidia of Anodonta cygnea L.

Lukacsovics, Ferenc and Lábos, Elemér (1965) Chemo-ecological relationship between some fish species in Lake Balaton and the glochidia of Anodonta cygnea L. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 32. pp. 37-54. ISSN 0365-3005

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Abstract

1. In this paper the effect of mucus of epidermis and serum of some fish species living in Lake Balaton (Cyprinus carpio, Carassius carassius, Rutilus rutilus, Abramis brama, Lucioperca lucioperca and Pelecus cultratus) produced on the larvae of Anodonta cygnea L. was investigated. 2. Motor activity of adductors may be induced also by tactic stimuli, but its tonicity is only of short duration. 3. The mucus obtained from epidermis is capable of producing considerable rhythmic and tonic activity in case of every fish species investigated. 4. The concentration dependency of rhythmic activity of a group of glochidia has a maximum, and the dependency of tonic responses on concentration may be illustrated graphically with an S-shaped curve. 5. In the lasting attachment of glochidia important ecological role is attributed to undiluted substances producing instantaneous and lasting tonic reactions. It is feasible that the attachment of glochidia is rendered possible by the rhythmic activity preceeding tonicity. 6. The chemoecological estimation of data shows that the mucus of epidermis and serum of fish species do not differ qualitatively and so on basis of these the glochidia do not have a distinguished host. 7. Quantitative differences were observed when using different dilutions. The activity produced with the mucus and serum of Abramis is most conspicuous, and it is assumably due to an organic substance (ichthyotoxin?) whereas the chemoecologically important act may be explained also by the inorganic salt constituents of tissues.

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