Published in Scientific Papers. Series D. Animal Science, Vol. LXIII, Issue 1
Written by Tatiana BEGUN, Adrian TEACA, Mihaela MURESAN, Ana-Bianca PAVEL
Following the changes in physical factors, the benthic fauna was affected by the decrease in water salinity. The aim of this paper is to identify the trend of changes in the mollusc populations of the most important lagoon system on the Romanian Black Sea coast. After a period of reduced concern for the knowledge of Razim-Sinoe Lagoon System ecological evolution, the studies and researches carried out by GeoEcoMar in 2002-2017 aimed at updating the qualitative and quantitative assessment of the structure of the mollusc populations in the four main lakes, as well as improving the knowledge of the structural and functional changes in these lakes. Currently, the population structure is composed of 14 living species among of the 52 found in the composition of the substrate as recent or subfossil shell debris. By comparing the biological data recorded between 2002 and 2017 with data from the 1970s, it became obvious that a series of euryhaline species and the most sensitive freshwater forms had disappeared. These species were gradually replaced by new freshwater stenobiotic forms, which are more resistant.
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