Horizontally occurrring quantitative phytoplankton investigations in Lake Balaton, 1974

Tamás, Gizella (1975) Horizontally occurrring quantitative phytoplankton investigations in Lake Balaton, 1974. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 42. pp. 219-279. ISSN 0365-3005

Preview

Text 221_cut_MTA_TihanyiBiologiaiKutIntEvkonyve_42.pdf Download (24MB) | Preview

Abstract

The author examined 177 lifted samples and 100 netfiltrates taken from 15 stations along the 5 transversal sections of Lake Balaton in the period of February December 1974. It was established that the 160 species and 6 varieties belong to the following six taxonomic phyla: Cyanophyta 22, Euglenophyta 11, Pyrrophyta 12, Chrysophyta 66, Chlorophyta 54, Caulobacteriales 1. The highest number of species (79) was found in the Keszthely Bay on September 18 and the lowest ones (22) at section Balatonfüred—Zamárdi in late June and at section Balatoalmádi—Balatonvilágos in March. Maxima of individuals were noted in December at transversal sections M (20 million) and K (23 million). Minimum of individuals (381,600) was found between Balatonfüred and Zamárdi at the end of June. In the Keszthely Bay the number of filamentous blue-greens (Anabaena and Aphanizomenon species) increased from mid-September till the end of October. On September 18, in addition to the filamentous blue-greens the biomass value of 13.5 mg/litre was significantly contributed by the Ceratium hirundinella population too. The lowest biomass values of the sections varied between 0.5 and 1.4 mg/litre. The great quantity of Synedra acus var. angustissima produced an opalescent water coloration in March, while in the period of September October a water bloom of blue-greens (Anabaena, Aphanizomenon) occurred at the south-western region of the lake. Just here a frequency of 7.0-15.8 million individuals/litre of Nitzschia acicularis with the Cryptomonas species made the water brownish-green from October till December .

Actions (login required)

Edit Item