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- Title
THE STRUCTURE OF BENTONIC POPULATIONS FROM THE LOWER SECTOR OF THE OLT RIVER (ROMANIA).
- Authors
Florina, MIHAI; Olivia, CIOBOIU
- Abstract
The limnological peculiarities of the dam lakes are largely dependent on the pulsating character of the stationary water circulation, as well as on the economic needs. The ecological balance of the Olt River in the lower sector was drastically affected after the arrangement, there were a number of changes in the morphology of the riverbed and river banks, as well as important changes in the flow of surface and groundwater, soil cover and biotic environment. All these have led to profound changes in the structure of aquatic biocenoses, by reducing some populations to the limit of survival, replacing rheophilic populations with pelophilic, pelophytophilic or phytophilic populations, or even leading to the disappearance of some species, the most affected being the benthic and nectonic fauna. The complex development of the Olt River determined its structural and functional characteristics. The structures of biotopes and biocenoses are specific to both typical rheophilic and stagnophilic ecosystems. In accordance with the determined characteristics of the arrangement, all the specific ecological compartments (planktonic and benthic) can be identified in the structure of the biocenoses. Benthic fauna is represented by 10 groups of invertebrates, dominated by oligochaetes, bivalves, chironomides, gastropods. Gastropods have an important role in the transfer of matter and energy to higher consumers - fish.
- Subjects
GROUNDWATER flow; BENTHIC animals; BIOTIC communities; RIPARIAN areas; WATER table
- Publication
Oltenia, Studii si Comunicari Seria Stiintele Naturii, 2021, Vol 37, Issue 2, p171
- ISSN
1454-6914
- Publication type
Article