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During this biological assay an insect richness in permanent waters of the lake system has been noticed compared to temporary ponds [ 92 ]. The large abundance of larvae of Chironomids suggests a significant organic load and the existence of an oxygen deficiency in the substrate. The occurrence of the marine species, i.
Our results showed that the decrease in taxon richness is related to anthropogenic influences that took effect on the qualitative and quantitative structures of the benthic populations. Today, the dominant forms are represented by freshwater species. It was noticed that Euryhaline taxa of bivalves, gastropods, crustaceans, i.
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Lamarck, , Hydrobia sp. Hartmann, , Briozoa, Balanus sp. Costa, , marine ostracodes and sensitive freshwater Theodoxus spp. Montfort, species disappeared . They have been gradually replaced by newly emerged stenobiont i.
The biological assessment in terms of composition, relative abundance, and diversity of the benthic macro invertebrate communities, concluded that within the investigated area developed mainly freshwater species, and subordinately brackish ones. Therefore, the ecological succession of the lagoon complex showed a gradual transition from the marine to a freshwater environment. Despite the large regional and local pressures in terms of natural and anthropogenic influences, the present study evidenced that the Razim-Sinoie lagoon system is in near good ecological condition.
Both physico-chemical and biological indicators affirmed good ecological status. Investigated lakes are well-oxygenated with alkaline character. The levels of the physico-chemical parameters agreed generally with related environmental standards. In this sense, the results did not identify levels that would warrant special concern. The exception was represented by some unsatisfactory levels for a few indicators encountered in some sectors of investigated lakes, where, individual values only incidentally exceeded the acceptable threshold, but with levels and areal distribution that would not warrant special concern.
With reference to surficial sediments, the lithological analyses have allowed the separation of the two types of recent accumulations, sediments with high levels of siliciclastic content and transitional areas characterized by sediments rich in organic matter, that are consistent with the geomorphological features of the lagoon system. The levels of heavy metals under study were below the recommended allowable limits.
In this sense, there has currently no clear evidence of heavy metal contamination in investigated lakes. The results of the biological assessment suggested that the anthropic disturbances gradually impair the functioning of the lagoon system. In general, lagoon ecosystems are directly related to the complex physical, chemical and biological processes taking place within its environment.
A proper functioning of a lagoon system is mainly characterized by their degree of mixing between freshwater and saltwater and the level of dissolved oxygen present in water. Even if, over time it was noticed an intense development of freshwater species to the detriment of marine organisms, it can be appreciated that the natural balance freshwater and saltwater influences of the ecosystems is quite well maintained.
In this context, the obtained results are of particular significance since the majority of the investigated physicochemical indicators are key parameters in providing a sustainable habitat that withstand environmental conditions, being as well the binding factors for the survival of aquatic organisms, especially flora and fauna. Even if parts of the obtained data were rather uniform, lacking significant variability, they can provide a basis to assess the environmental conditions. Finally, this study improved and increased the database on the environmental conditions of the lagoon system, an area of great ecological importance to the preservation of ecosystems, taking into consideration the great variability and heterogeneity in the numerous variables that control and characterize transitional water systems.
Some inaccuracies slight deviations of the results compared to the admissible limit seem to be rather related to natural stressful conditions of transitional waters, or, due to the particularities of the local environmental conditions in the study area.
Such information may be of significant importance in understanding the functioning of the Razim-Sinoie Lagoon System in order to preserve and protect these vulnerable particular wetlands. Likewise, we would like to show our appreciation and thanks to Dr.
Melinte-Dobrinescu and Dr. Chapman D. Hatvani I. Lakes Res.
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