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- Title
CHANGES IN THE STRUCTURE OF BENTHIC BIOCOENOSES ON THE LOWER COURSE OF THE DANUBE FROM 1996 TO 2004.
- Authors
Oreanu, Priscila Ana
- Abstract
The aim of this study was to evaluate long-term changes in the distribution and diversity of benthic fauna in the lower (Romanian) sector of the Danube River from 1996 to 2004. Up to 43 taxa (also including developmental stages of some species) belonging to 22 supra-specific taxonomic groups were identified, with determination down to the level of the species made only for molluscs, polychaetes and ostracods, the other organisms being grouped according to supra-specific taxa. On the whole the most frequent benthic organisms were worms (represented by oligochaetes and nematods), with frequencies ranging from 65% to 100%, which can be regarded as euconstant and constant organisms. The other forms encountered are accessory or just accidental. In both years worms contributed with 90% to the constitution of the general densities of benthic fauna, while the taxonomic structure of the benthic biomass was dominated by molluscs with 99%. In 2004 rich populations of Corbicula fulminea, an alien species, occurred.
- Subjects
DANUBE River; BENTHIC animals; OLIGOCHAETA; TAXONOMY; BIODIVERSITY
- Publication
GeoEcoMarina, 2010, Vol 16, Issue 1, p93
- ISSN
1224-6808
- Publication type
Article