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• W2371301488 abstract "AbstractWeillustratethefundamentalimportanceofsuctuationsinnaturalwatersowstothelong-termsustainabilityandproductivityofriverineecosystemsandtheirriparianareas.Naturalsowsarecharacterizedbytemporalandspatialheterogeneityinthemagnitude,frequency, duration, timing, rate of change, and predictability of discharge. These characteristics, for a speciÞc river or a collectionof rivers within a deÞned region, shape species life histories over evolutionary (millennial) time scales as well as structure theecological processes and productivity of aquatic and riparian communities. Extreme events– uncommon soods or droughts– areespecially important in that they either reset or alter physical and chemical conditions underpinning the long-term development ofbiotic communities. We present the theoretical rationale for maintaining sow variability to sustain ecological communities andprocesses, and illustrate the importance of sow variability in two case studies– one from a semi-arid savanna river in South Africaand the other from a temperate rainforest river in North America. We then discuss the scientiÞc challenges of determining thedischarge patterns needed for environmental sustainability in a world where rivers, increasingly harnessed for human uses, areexperiencing substantially altered sow characteristics relative to their natural states.To cite this article: R.J. Naiman et al., C. R.Geoscience 340 (2008).# 2008 AcadŽmie des sciences. Published by Elsevier Masson SAS. All rights reserved.ResumeVariabilite des debits et vitalite biophysique des systemes uviaux.Nous illustrons lOimportance fondamentale des suxhydriques naturels pour la permanence ˆ long terme et la productivitŽ des Žcosystmes lotiques et riverains. Les sux naturels sontcaractŽrisŽs par une hŽtŽrogŽnŽitŽ temporelle et spatiale des dŽbits, de par leur ampleur, frŽquence, durŽe, calendrier, vitesse dechangement et prŽdictibilitŽ. Ces caractŽristiques, pour une rivire ou lOensemble des rivires dOune rŽgion donnŽe, faonnent leshistoires de vie des espces sur des Žchelles de temps millŽniales, de mme quOelles structurent les processus Žcologiques et laproductivitŽ des communautŽs aquatiques et riveraines. Les ŽvŽnements extrmes– crues ou sŽcheresses inhabituelles– sontparticulirementimportants,enceciquOilsrŽtablissentoumodiÞentlesconditionsphysiquesetchimiquesdudŽveloppementˆlongterme des communautŽs biotiques. Nous prŽsentons les bases thŽoriques dOune prŽservation des rŽgimes de dŽbit, dans le butdOentretenir les communautŽs et les processus Žcologiques. Nous illustrons lOimportance de lavariabilitŽ des dŽbits par deux Žtudesde cas– une rivire de savane semi-aride en Afrique du Sud et une rivire de fort pluvieuse tempŽrŽe en AmŽrique du Nord. Nousdiscutons ensuite la question des rŽgimes de dŽbit nŽcessaires ˆ la permanence des Žcosystmes dans un monde o les rivires, de" @default.
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• W2371301488 date "2008-01-01" @default.
• W2371301488 modified "2023-09-26" @default.
• W2371301488 title "Surface geosciences (hydrology-hydrogeology) Flow variability and the biophysical vitality of river systems" @default.
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