Preface F. Fournier and A. Szollosi-Nagy; Part I. Introduction: 1. The groundwater/surface water ecotone perspective: state of the art J. Gilbert, F. Fournier and J. Mathieu; Part II. Function of Groundwater/Surface Water Interfaces: 2. Ecotonal animal assemblages: their interest for groundwater studies D. L. Danielopol, R. Rouch, P. Pospisil, P. Torreiter and F. Moszlacher; 3. Stochasticity in resource utilization by a larval chironomidae (diptera) community in the bed sediments of a gravel stream P. E. Schmid; 4. Temporal and spatial dynamics of meiofaunal assemblages in the hyporheic interstitial of a gravel stream J. M. Schmid-Araya; 5. Interstitial fauna along an epigean-hypogean in a Rocky Mountain river J. V. Ward and N. J. Voelz; 6. Filter effect of karstic spring ecotones on the population structure of the hypogean amphipod Niphargus virei F. Maland, M. J. Turquin and G. Magniez; 7. Community respiration in the hyporheic zone of a riffle-pool sequence M. Push; 8. Diversity, connectivity and variability of littoral, surface water ecotones in three side arms of the Szigetko region (Danube, Hungary) A. Bothar and B. Rath; 9. Seasonal dynamics and storage of particulate organic matter within bed sediment of three streams with contrasted riparian vegetation and morphology L. Maridet, M. Philippe, J.-G. Wasson and J. Mathieu; 10. Bedsediments: protein and POM content (RITRODAT-Lunz study area, Austria) M. Rulik; 12. Surface water/groundwater/forest alluvia ecosystems: functioning of interfaces: the case of the Rhine floodplain in Alsace (France) M. Tremolieres, R. Carbiener, I. Eglin, F. Robach, U. Roeck and J. M. Sanchez-Perez; 13. Modelling of hydrological processes in a floodplain wetland C. Bradley and A. G. Brown; 14. Contribution to the groundwater hydrology of the Amboseli ecosystem, Kenya A. M. J. Meijerink and W. van Wijngaarden; 15. The role of hydrology in defining a groundwater ecosystem J. E. Dreher, P. Pospisil and D. L. Danielopol; 16. Typology of water transport and chemical reactions in groundwater/lake ecotones O. Frazle and W. Kluge; 17. Development of a water transfer equation for a groundwater/surface water interface and use of it to forecast floods in the Yanghe Reservoir Basin S. Liu; 18. Uses and limitations of ground penetrating RADAR in two riparian systems G. C. Poole, R. J. Naiman, J. Pastor and J. A. Stanford; Part III. Malfunction of Groundwater/Surface Water Interfaces: Causes and Methods of Evaluation: 19. Heterogeneity of groundwater-surface water ecotones V. Vanek; 20. Failure of agricultural riparian buffers to protect surface waters from groundwater nitrate contamination D. L. Correll, T. E. Jordan and De. E. Weller; 21. Stable nitrogen isotope tracing of trophic relations in good webs of river and hyporheic habitats R. C. Wissmar, J. A. Stanford and B. K. Ellis; 22. La zone hypodermique du sol ecotone entre eaux meteoriques et eaux souterraines dans l'infiltraqtion des pesticides dissous C. Thirrio and B. Caussade; 23. Soils of the north-eastern coast of the Caspian Sea as the zone of sea water/groundwater interaction T. A. Glushko; Part IV. Management and Restoration of Groundwater/Surface Water Interfaces: 24. Ecotones and problems of their management in irrigation regions V. S. Zaletaev; 25. Hydrochemistry and ecohydrology of the transition area of the Netherlands Delta and the Brabantse Wal T. W. Hobma; 26. Cautious reforestation of a wetland after clearfelling G. Jacks, A.-C. Norrstrom, A. Joelsson and U. Johansson; 27. Responses of riparian ecosystems to dewatering of the Aral Sea in the vicinity of the Tedgen and Murgab rivers T. V. Dikariova; 28. Water regime management of desertificated ecotone systems in the Amudarya delta (Aral Sea basin) N. M. Novikova and I. N. Zabolotsky; Part V. Conclusion: 29. Problems and challenges in grounewater/surface water ecotone analysis J. Gilbert and F. Fournier; Annex.