Az Eszterházy Károly Tanárképző Főiskola Tudományos Közleményei. 1991. (Acta Academiae Paedagogicae Agriensis : Nova series ; Tom. 20)

Milinki Éva: Az egerszalóki víztározó plankton-szerkezete

MILINKI ÉVA AZ EGERSZALÓki VÍZTÁROZÓ PLANKTON-SZERKEZETE ABSTRACT: We carried out our investigations in the Laskó stream and the reservoir created by damming the above mentioned stream in 1988. We dealed with the structure of phyto- and Zooplankton. The effects of the surrounding environment on the laké created a very rieh plankton populations. We'd been found seasonal changes in the structure of plankton. In spring the small algae species and in summer the large species were typically. The Zooplankton population controlls the phytoplankton. In case of Zooplankton in spring the large Daphnia species and in simmer the small Bosmina species dominated. In wiuter as a result of the unfavourable temperature and feeding conditions few species were found and only in small numbers. In summer and autumn east part of reservoir was completly covered by bluegreen algae of the Microcystis aeruginosa. Blue-green algae species eliminated the other organisms in this time, and the diversity was 0,00. At the time of our investigations were found two diversity minimum. The first was in winter wich is due to the unfavourable environmental factors and the other was in summer. In summer a few species were found in large numbers and it was the reeason of diversity minimum. The effects of the environmental factors on the laké during the period of the investigation was strongly eutrophic, and plankton's structure indicated of eutrophication. BEVEZETÉS Az egerszalóki tározót Egerbakía és Egerszalók községek között hozták létre a Laskó-patak duzzasztásával 1981-ben. A tározót árvízvédelmi és öntözési céllal létesítették, de már jelenleg sem hagyható figyelmen kívül a tározó intenzív halászati hasznosítása. 49