Dominik KOCINGER Foreword Igor MUCHA Pre dam development of the Danubian lowland Igor MUCHA Project PHARE Dominik KOCINGER, Igor MUCHA, Zoltán HLAVATÝ, Katarína KUČÁROVÁ Development after putting the Gabčíkovo step into operation Igor MUCHA, Zoltán HLAVATÝ, Ľubomír BANSKÝ, Dalibor RODÁK, Erika KÚROVÁ Basic aspects of the Gabčíkovo step structures Igor MUCHA, Zoltán HLAVATÝ, Mária KOZOVÁ Ecological part of the framework agreement between the government of the republic of Hungary and the government of the Slovak republic on implementation principles of the International court of justice judgement Zoltán HLAVATÝ, Ľubomír BANSKÝ, Dalibor RODÁK, Katarína KUČÁROVÁ Surface water, ground water and soil moisture regime Jarmila MAKOVINSKÁ The Danube water quality between Bratislava and Visegrád (1989 - 1997) Jarmila MAKOVINSKÁ, František HINDÁK Phytoplankton of the river Danube between Bratislava and Visegrád in 1990 - 1997 Marian VRANOVSKÝ, Marta ILLYOVÁ Zooplankton in the Danube and its left side arm system Ilja KRNO, Ferdinand ŠPORKA, Dušan MATIS, Eva TIRJAKOVÁ, Jozef HALGOŠ, Vladimír KOŠEL, Eva BULÁNKOVÁ, Daniele ILLÉŠOVÁ Development of the Zoobenthos in the slovak Danube inundation area after the Gabčíkovo hydropower structures began operating Jaroslav ČERNÝ Monitoring of Ichtyocoenoses in the slovak stretch of the Danube and in its side arms Jaroslav ČERNÝ, Beata KVASOVÁ Impact of the Gabčíkovo project on fish - data review Anton KIRKA Ichtyofauna and fisheries of the Čunovo reservoir Štefan NAGY Composition of Macrozoobenthos of the Čunovo reservoir with respect to trophical potential for fish communities Ladislav ŠOMŠÁK Flora and vegetation conditions of floodplain ecosystems Eduard BUBLINEC, Ján KUKLA Quality of soil in the Gabčíkovo structures area Ferdinand KUBÍČEK Productivity of the Herb layer in the Danubian lowland floodplain forest Július OSZLÁNYI Dynamics of leaf area index in forest ekosystems of the Danube floodplain in the period of 1988-1998 Štefan ŠMELKO Tree species diameter growth and increment in the Gabčíkovo adjacement forest stands Ladisla VARGA Saving of the forest tree species gene-pool in the area of the Gabčíkovo structures Eva UHERČÍKOVÁ, Peter PIŠÚT, Jan HAJDÚK Changes of flood-plain forests vegetation in the permanent monitoring plots and vegetation succession on the Gabčikovo structures dikes Ladislav JEDLIČKA, Ivan ORSZÁGH, Tomáš ČEJKA, Alžbeta DAROLOVÁ, Miroslav KULFAN, Peter MIKULÍČEK, Zbyšek ŠUSTEK, David ŽIAK Terrestrial fauna Rastislav RYBANIČ Birds