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    STUDIA BIOLOGIA - Issue no. 1 / 2009  
         
  Article:   AQUATIC MACROPHYTES IN THE DANUBE DELTA – INDICATORS FOR WATER QUALITY AND HABITAT PARAMETERS.

Authors:  ERIKA SCHNEIDER . 		 
       
         
  Abstract:   The diversified types of water bodies in the Danube Delta, their hydrological regime and trophic condition offer the basis for a large range of aquatic macro- and microhabitats. These are settled by various macrophytes and their communities and are distributed along ecological gradients. The aim of our research has been to make out the differentiation between various types of water bodies (standing and running waters) on the basis of the indicator value of water macrophytes. This concerns not only water quality i.e. the trophic condition of the water bodies, but also physical parameters.
         Studies showed that only a few species are bound to running waters, other species occur in both water types, i.e. in slowly running waters abundant in suspended solids and in standing waters showing different degrees of turbidity or with clear water in more isolated lakes. A large range of macrophytes is only characteristic of lakes occupying different ecological niches in these water bodies.        
         After having studied the water macrophytes for several years in the Danube Delta/Romania and after having been able to monitor some sampling points in chosen areas (Babina, Cernovca, Popina, Fortuna, Isac-Uzlina), the species’ indicator values became much more precise in their different evolution stages. They demonstrated the dynamics of the sites in the studied areas and at the same time showed the possibility to use water macrophytes as perfect indicators for water quality and as indicators for water dynamics, including the regime of suspended solids, the filtering capacity of vegetation and sedimentation processes.

Keywords: types of water bodies, macro- and microhabitats, water macrophytes, ecological gradients, water quality indicators, habitat quality indicators, macrophyte communities 		 
         
     
         
         
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