Investigations on crustacean and molluscan remains inthe upper sedimentary layer of Lake Balaton

Ponyi, Jenő (1971) Investigations on crustacean and molluscan remains inthe upper sedimentary layer of Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 38. pp. 183-197. ISSN 0365-3005

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Abstract

Investigating 15 cm long and 3 cm wide mud-cores taken from 7 points of each 5 transversal sections of Lake Balaton it has been established: 1. The frequency and relative amounts of Mollusca and Ostracoda shells rapidly increases toward north especially between the axis of depth of the lake and the northern shore. The relative amount of Cladocera fragments is lower in the cores of the Keszthely-Bay than in the other investigated sections. 2. The ratio of Candona and Darwinula shells compared to each other seems to be connected with the amount of detritus. The decrease of the latter causes a change in the ratio in favour of Candona while an increase brings on opposite effect. 3. The population of Bosmina longirostris might have been significant in the south-western basin of Lake Balaton during the last 70-90 years. 4. On the basis of occurrence of Dreissena shells in depth, considering 35 years, the average siltation of Lake Balaton can be estimated as 1.7 mm/year. The siltation seems to be most intense in the central regions of the lake.

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