Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 83. (Budapest 1991)

Lakatos, Gy., Ács, É. ; Buchtijarova, L. N.: Study on reed-periphyton in Lake Velence

ANNALES HISTORICO-NATURALES MUSEI NATIONALIS HUNGARICI Tomus 83. Budapest, 1991 p. 187-197. Study on reed-periphyton in Lake Velence by GY. LAKATOS, Debrecen, É. Ács, Budapest & L. N. BUCHTLTAROVA, Kijev LAKATOS, G Y., ÁCS, É. & BUCHTUAROVA, L. N.: Study on reed-periphyton in Lake Velence. - Annls histnat. Mus. natn. hung. 1991, 83: Abstract - In this paper we give an account of our findings between 1978 and 1988, while measuring the trends and tendencies of water quality due to the rehabilitation of Lake Velence. Dry mass and phytotecton analyses of reed-periphyton collected in 1978 and 1988 are presented. With 5 tables, 1 figure and 2 photoplates. INTRODUCTION To determine the quality of shallow water bodies, besides the studies on water chemistry and phytoplankton, it is necessary and essential to investigate the benthonic complexum - i. e. the aquatic plants and their periphyton - and reveal its role in them. It is especially true in our shallow water bodies, where the study on aquatic plants and periphyton should deserve more attention. Nowadays the most common danger to our waters is eutrophication. This phenomenon can be defined as a biological response to increased trophity, which causes over proliferation of plants. In order to reveal the direction and intensity of changes due to eutrophication or the processes of rehabilitation, it is necessary to evaluate the original state and the prevailing conditions from several aspects of biology. SAMPLING SITES AND METHODS The periphyton samples from green and old reed were taken at the open water side of reed stands (Fig. 1) in some characteristic water areas of Lake Velence from 1978. The classification of water areas of the lake follows the descriptions of BARTHA (1977), FELFOLDY (1972) and LAKATOS (1986): a - Dark brown water area: Vendel-tisztás (Ve), Nagytó-Rigya (Na), Gallér (Ga), Vaskapu (V), Hollóstisztás (Ho) b - Grey water area: Nagy-tisztás (Nt), Felső-tó (Fe), Nádas-tó (N), Belső-tisztás (B) c - Algal brown water area: Öreg-tisztás (Ö), Kárászos (K) d - Green water area: Fürdető (Fü) e - Transitional water quality area: Hosszú-tisztás (Ht), Lángi-tisztás (L) In addition, reed periphyton samples were collected from Német-tisztás (Né), which belongs to the brown water area. During our reed-periphyton sampling water depth and transparency were measured, and water samples were taken for chemical analysis. The wet and dry mass, the ash and chlorophyll-a contents were determined. The phyto- and zootecton samples were taxonomically, qualitatively and quantitatively analysed.