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...Fresh surface water vol ii river ecosystems m zalewski lapinska and i wagner department of applied ecology university lodz poland keywords ecosystem scientific paradigms ecohydrology impact on resources climate changes basin management contents introduction evolution the in an integrative interdisciplinary approach for research watershed cumulative threats due to instability inappropriate environmental fate pharmaceutical contamination drugs chemical ddt pcbs conclusions appendix glossary bibliography biographical sketches summary although longitudinal linkages played a most important role early thinking as zones concepts continuum concept there is un unesco eolss urgent need replace this paradigm dimensional one considering whole context e g proposed by ehc sample chapters growing body evidence that results human activity different parts its can significantly affect functioning other remote system be harmful biota beings restoration strategies should thus apply ecohydrological methods...