The quantitative proportions Rotifera plankton in Lake Balaton, in 1967

P.-Zánkai, Nóra and Ponyi, Jenő (1970) The quantitative proportions Rotifera plankton in Lake Balaton, in 1967. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 37. pp. 291-308. ISSN 0365-3005

Preview

Text 293_cut_MTA_TihanyiBiologiaiKutIntEvkonyve_37.pdf Download (8MB) | Preview

Abstract

1. With regard to the quantity of the total Rotifera significant difference occurred between Keszthely-Bay and the open water areas of the lake. The average values per section during the whole period of investigation in Keszthely- Bay yielded 64 sp/1, while for the other sections (“K” - “E”) this value fluctuated between 125 and 171. 2. The number of individuals of the total Rotifera plankton in every section increase twice (perhaps three times?). 3. The 24 species determined during the investigations, including varietas and forms too, five species (Keratella cochlearis, K. c. tecta, K. quadrata, Polyarthra vulgaris and Pompholyx sulcata) can be regarded as the main components of Rotifera plankton in Lake Balaton. From among these species the population of K. quadrata and P. sulcata increases once in the whole area of the lake. K. cochlearis and К. c. tecta show two maxima in the middle part of the lake (“K” - “G”), while towards the two ends of Lake Balaton they show only one maximum. Polyarthra shows clear population increase twice only in Keszthely-Bay, while in the other parts of the lake apparently it shows three maxima. The development of maxima generally may be placed in the month of May, and in August and October. 4. The quantitative change of the Rotifera plankton is inversely proportional with Secchi (transparency); i.e. apparently it is directly proportional with the concentration of the formed foodstuff. 5. The population changes and dynamics of Rotifera plankton cannot be elucidated even by detailed and regular investigations if it is restricted to only one section, because investigating the different areas of the lake in the same time, the development of Rotifera population may differ from one another. 6. The double population increase of the total Rotifera plankton and the proliferation of species indicating eutrophic processes apparently prove that Lake Balaton may be ranged among the moderately eutrophic waters.

Actions (login required)

Edit Item