scholarly journals Hallmarking microplastics of sediments and Chamelea gallina inhabiting Southwestern Black Sea: A hypothetical look at consumption risks

2022 ◽  
Vol 174 ◽  
pp. 113252
Author(s):  
Kenan Gedik ◽  
Ahmet Mutlu Gozler
Keyword(s):  



2020 ◽  
Vol 15 (1) ◽  
pp. 16-27
Author(s):  
Zh. P. Selifonova ◽  
V. K. Chasovnikov ◽  
E. Z. Samyshev ◽  
P. R. Makarevich

Aim. To study the state of the marine ecosystem of the recreational‐tourist zone of the Caucasian sector of the Black Sea through the example of a beach near the mouth of the Agoy River.Material and Methods. Phytoplankton, heterotrophic bacterioplankton, infusoria, holoplankton, meroplankton, ichthyoplankton, zoobenthos of loose bottom sediments and hydrochemistry samples of the water and bottom sediments were collected in June 2012 on three sections from the mouth of the Agoy River to the coastal runoff zone (depths 2.5–7.5 m). The identification of species of plankton and of the zoobenthos and of the chemical parameters of water and sediments was carried out according to standard methods. Results. It was revealed that most of the beach area, where psammophilic biocenoses of Lucinella divaricate and Chamelea gallina (Bivalvia) were located, was in satisfactory condition. An increase in the density of Lucinella divaricate, a rare species in the late 1990s, was noted. In the runoff zone, there was observed the appearance of cyanobacteria and the suppression of zoobenthos, expressed through the replacement of mollusc biocenoses by the biocenosis of the polychaete, Capitella capitate, with a biomass two orders of magnitude lower than the average for the area. High numbers of heterotrophic bacterioplankton (4.5 million cell/ml) and infusoria (64 million ind./m3) could indicate bacterial contamination of this zone. The negative impact of waste water on plankton is manifested in a decrease in the population of netted zooplankton, their abnormal development, and the increasing role of microheterotrophs.Conclusions. The results obtained give an image of the state of marine coastal ecosystems of recreational‐tourist and cordoned areas of the Caucasus and can be useful for the further monitoring of this region.



2021 ◽  
Vol 27 (4) ◽  
pp. 4077-4083
Author(s):  
Borislava K. Pavlova ◽  
◽  
Sevginar F. Ibryamova ◽  
Dаrina Bachvarova ◽  
Dimitar D. Doichev ◽  
...  

The "white sand mussels" are edible bivalves inhabiting the littoral shores usually buried in the sand. Тhey are invasive species for the Bulgarian waters of the Black Sea. The samples for this study were collected from different points on the northern and southern Black Sea Bulgarian coast in the period January 2020 to December 2020. The study of different types of microorganisms was performed by using the microbial identification system model: MicroLog M® BIO45101 BiologInc and the software product GEN III. The physic-chemical parameters of the waters – temperature, pH, salinity and dissolved O2 were also determined. In the different species, we had detected specific microbiological complexes. The species Pseudomonas viridilivida and Citrobacter farmer were isolated only from Donax trunculus. The species Escherichia hermannii was found only in Mya arenaria, and Acinetobacter johnsonii was detected only in Chamelea gallina. The isolated species Acinetobacter gyllenbergii and Acinetobacter johnsonii are related to humans and are indicators for pollution of the water with channel waste waters. Our results demonstrated an increase ofhe quantity of the coliforms the region of Sveti Vlas from August, where they were 50 the norms. In the region of Arkutino in July and Ahtopol in August, the quantity of the fecal coliforms is 190 and 30 times the norms prescribed in the Ordinanceo. 4 from 20.10.2000 for the quality of fisheries water and the breeding of shellfish (the amount of fecal coliforms in the inter-shell content should be less than 300 NVB). We noticed also seriousollution of the Varna lake even months after an accident with a leaky pipe.



Author(s):  
Göktuğ Dalgiç ◽  
İbrahım Okumuş ◽  
Sedat Karayücel

Age and growth of the clam Chamelea gallina from dredged, non-dredged and closed areas of the Turkish Black Sea coast were estimated. Von Bertalanffy growth curves were fitted for each sampling site; asymptotic length (L∞) values ranged between 25.995 and 28.883 mm and the growth coefficient (K) from 0.164 to 0.217 per year. Results indicate growth rates were significantly reduced in the far eastern commercial populations compared with those in western populations. According to our results presented here it can be concluded that C. gallina at closed area does not grow as fast as non-dredged stock and this is because of the shortness of closure season. Nevertheless we suggest that fallowing is the major precaution for the recovery of C. gallina stocks in the Black Sea.









2019 ◽  
Author(s):  
Sergiu Musteata
Keyword(s):  




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