La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	At the extreme of physical gradients: phytoplankton in highly flushed, large rivers
Auteurs :	Nico Salmaso, Auteur ; Andrea Zignin, Auteur
Type de document :	Article
Dans :	Hydrobiologia (639(1) FEB 2010)
Article en page(s) :	21-36
Résumé :	Phytoplankton and associated environmental factors were collected fortnightly during a 1-year cycle in the upper and lower reaches of the River Adige (northeastern Italy). The river has a typical Alpine flow, with the period of high flow and flooding occurring in the spring and summer months. Phytoplankton biomass was constrained by physical variables, mainly water discharge and associated variables directly linked to water fluxes. These factors acted negatively and synchronously by diluting phytoplankton cells and worsening the light regime. Nutrient concentrations did not appear to limit phytoplankton growth. Compared to many other central European rivers, the very low maximum algal biomasses supported by River Adige (Chl a

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