PRELIMINARY ASPECTS CONCERNING MACROINVERTEBRATES QUALITATIVE STRUCTURE IN THE DANUBE RIVER

Adina Popescu, Daniela Ibanescu, I. Vasilean, Aurelia Nica

Abstract
   The authors present the qualitative structure of macroinvertebrates recorded in the Danube River sector of Calăraşi and Brăila (km 375- km 175). On the basis of samples collected in the vegetative season of the 2011, in seven critical points (PCO1- area Bala end sandbank Caragheorghe, PCO2- area Island Epurasu, PCO3- upstream and downstream Seica, PCO4- Islands Ceacaru and Fermecatu, PCO7- Island Fasolele, PCO9- area Varsăturii, PC1O- channel Caleia (Ostrovul Lupu) were highlighted seven taxonomic groups namely: Oligochaeta, Gastropods, Bivalves, Ostracods, Amphipoda, Odonata, Diptera.
   They were identified in total 16 species of macroinvertebrates. Macroinvertebrates are present in all plants analyzed are represented in most of the gastropods (13.79-82.69%).

Key words: macroinvertebrates, species, qualitative structure