Qualitative and quantitative studies in the coatings of Potamogeton perfoliatus and Myriophyllum spicatum in Lake Balaton

Entz, Béla (1947) Qualitative and quantitative studies in the coatings of Potamogeton perfoliatus and Myriophyllum spicatum in Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 17. pp. 17-37. ISSN 0365-3005

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Abstract

The coatings on small growths of Potamogeton and Myriophyllum in the open water and a bay of Lake Balaton, and the animal organisms living in them, were examined on the basis of material taken from different strata during 5 weeks at the beginning of the autumn of 1946. The organisms were; examined and numbered in a live condition, and the numerical data uniformly calculated to a given surface. On the Potamogeton the coatings are very thin near the surface and very rich near the bottom. The difference is more remarkable in the open water than in the bay. On Myriophyllum the coating is not so rich but more equally distributed. Characteristic organisms living in the coating according to frequency are: Punctodora, Nitocra sp. Corophium curvispinum, Chironomida larvae, Notommata sp., Dreissena polymorpha, etc. The differences between the animals harboured by the coating of Po tamoge ton and Myriophyllum are chiefly quantitative, although some qualitative differences were also observed. The organisms in closest relation to ithe coating live principally near the bottom, those more independent of it in the upper regions. A relation can be shown between the ra te of locomotion of th e organism and the ease with which it is washed away. The m ajo rity of th e inhabitants of the coating feed on (the detritus in the coating, or on Diatoms or other animal organisms living in it, and only; one or two specimens of a very few species were found to feed on the plant itself.

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