Vízügyi Közlemények, 1996 (78. évfolyam)
4. füzet - Csányi Béla: Vízfolyások hidrobiológiai vizsgálatának módszertani lehetőségei
384 Cs ányi В. Nesemann H.-Csänyi В.: Description of Batracobdelloides moogi n. sp., a leech genus and species new to the European fauna with notes on the identity of Hirudo paludosa CARENA 1824 (Hirudinea: Glossiphoniidae). Lauterbornia 21, pp. 69-79. 1995. Sládecek V: System of water quality from the biological point of view. Ergebnisse der Limnologie 7, pp. 1-128. 1973. Szabó J—Dévai Gy—Dévai I.-Horváth K.—Bancsi I. —Tóth M.: Hidroökológiai vizságlatok a Bükk és a Zempléni hegység vizeiben I. Acta Biol. Debrecen 8. 1970. Szabó J—Dévai Gy.—Dévai I-Horváth K.: Hidroökológiai vizsgálatok a Bükk és a Zempléni hegység vizeiben II. Acta Biol. Debrecen 9. 1971. Tuffery G.-Verneaux J.: Méthode de détermination de la qualité biologique des eaux courantes. Exploitation codifée des inventaires de fauna du fond. Ministere de Г Agriculture (France), 23 p. 1968. UN/ECE: Convention on the protection and use of transboundary watercourses and international lakes. Helsinki, 17 March 1993, p. 12. 1992. * * * Methodological option of the hydrobiological investigations of streams Béla CSÁNYI, biologist In investigating the benthic communities of streams one should take their varying habitats into consideration. This also refers to small streams. The time required for taking and analysing samples imposes a basic limitation on the investigations. Consequently it is desirable to apply relatively simple quantitative and semi-quantitative sampling methods for mapping benthic fauna. It can be stated that in the initial phase of investigating the relationship between bioindication and water quality the survey of the local fauna is the most important step in every countries. This initial phase of the investigations must not be bypassed in Hungary, neither. Since this activity is focused at the reference/phrenetic characteristics of the water body one may call this surveying activity as that of collecting information for ceno-biological patterns and coexistential structures. The methods of biological qualification are actually based on the knowledge on the ecological needs of various taxa, relying on the survey of the biota of flowing waters. Water quality management systems should be relying on those hydrobiological and ecological procedures that allow a relatively simple numerical formulation of the information available. This was the very basis of the saprobiological evaluation system, with its inherent faults and advantages, and the same refers to various scoring systems which render values to the sensitivity to and/or tolerance against pollution of various aquatic animals. A baseline survey of the fauna of Hungarian creeks would be an especially urgent task, since hydrobiological work of this type, considering the catchment basin as a whole, has not been unfortunately made in the past decades. A good example to this is the demand for a unified hydrobiological survey of the streams discharging into Lake Balaton, which faces a complex environmentál problem. The biological water qualification/monitoring system, being under development, would require the exact description of reference communities and groups of taxa that characterize unpolluted waters. The catchment basin oriented survey would be especially important as this would allow the "stepping over" of local problems and the searching of regional relationships and could also facilitate the identification of the bio"geographically deterministic characteristics. At the present water pollution control activities are in urgent need for such information. * * *
