AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Authors: IOAN CĂRĂUŞ.
The increased number of dam reservoirs determined a special interest in order to know their ecological impact. There are generally recognized major impacts of hydrotechnical developments as the integral destruction of terrestrial and aquatic biocoenoses from the flooded area, the breakdown of the river connectivity, with a dramatic impact upon the upstream fish migration. There are also well known the alterations of natural flow pattern and of alluvial transport downstream of dams; many authors emphasize the reduction of biodiversity as a consequence of river damming. In the paper it is discussed mainly a case study – the environmental impact on biodiversity – of hydrotechnical developments on the Bistriţa valley (the Eastern Carpathians, Romania). In fact, the apparition of a new, lacustrine habitat, determined the installation in the new biotope of a lot of lentic organisms, which previously could not occur under stream conditions. The emergence of true phytoplankton and zooplankton communities determines a real increase of biodiversity at the watershed level.
Keywords: biodiversity, dam reservoirs, environmental impact.
