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Invasive Alien Species of Benthic Macroinvertebrates and Fish in the Bulgarian Sector of the Danube River—Results of the Joint Danube Survey 4 (JDS4). WATER 2022. [DOI: 10.3390/w14152299] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The aim of this study was to assess the status of aquatic invasive alien species (IAS) in the shoreline zone of the Bulgarian sector of the Danube River, Danube tributaries, and adjacent standing water bodies in the frame of the Joint Danube Survey 4 (JDS4). Seven benthic macroinvertebrates and seven fish IAS were identified. The crayfish Faxonius limosus was frequently found and abundant in the tributaries. The mussels Corbicula fluminea, Dreissena rostriformis bugensis, and Sinanodonta woodiana dominated in the Danube River and the middle and lower reaches of the tributaries, while the fish Carassius gibelio, Perccottus glenii, and Lepomis gibbosus were most abundant in the standing water bodies. The integrated biocontamination estimated by taxonomic groups (crayfish, molluscs, and fish), sampling methods, and type of water bodies ranged from moderate in the shoreline zone of the Danube River, through moderate to high in the canals and lakes, to severe in the Danube tributaries and the reservoirs. The results demonstrate the importance of IAS in the assessment of the ecological status/potential of the water bodies in the DRB. The comprehensive evaluation of the aquatic IAS pressure will provide valuable information and support for the implementation of the national and EU IAS and water policies in the DRB.
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Kalcheva H, Stoichev S, Beshkova M, Kalchev R, Stanchkova M, Kozuharov D, Trichkova T. The Effect of Dreissena polymorpha on Bacterioplankton, Nematode Fauna and their Relations to Environmental Factors in Ogosta Reservoir (Danube Basin). TRANSYLVANIAN REVIEW OF SYSTEMATICAL AND ECOLOGICAL RESEARCH 2016. [DOI: 10.1515/trser-2015-0077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Spatial, seasonal, and annual bacterioplankton dynamics in recently infested by the species Dreissena polymorpha Ogosta Reservoir were studied for the first time during three year period. Bacterioplankton total number was higher in spring in ecotone zones, than in summer at thermocline. NH4-N, PO4-P, turbidity, dissolved oxygen, COD and chlorophyll-a correlate positively, while transparency and Ca2+ negatively with bacteria. Nematode species composition, included 22 species studied (13 rarely found and Rhabditis brevispina new for Bulgaria) belonging to nine families. The D. polymorpha impact is positive on nematodes and phytoplankton, negative on zooplankton and bacterioplankton, but weak positive on larger bacteria, rods and attached bacteria.
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Affiliation(s)
- Hristina Kalcheva
- Bulgarian Academy of Sciences, Institute of Biodiversity and Ecosystem Research, Tsar Osvoboditel Boulevard 1, Sofia, Bulgaria , BG-1000
| | - Stefan Stoichev
- Bulgarian Academy of Sciences, Institute of Biodiversity and Ecosystem Research, Tsar Osvoboditel Boulevard 1, Sofia, Bulgaria , BG-1000
| | - Mihaela Beshkova
- Bulgarian Academy of Sciences, Institute of Biodiversity and Ecosystem Research, Tsar Osvoboditel Boulevard 1, Sofia, Bulgaria , BG-1000
| | - Roumen Kalchev
- Bulgarian Academy of Sciences, Institute of Biodiversity and Ecosystem Research, Tsar Osvoboditel Boulevard 1, Sofia, Bulgaria , BG-1000
| | - Marieta Stanchkova
- Bulgarian Academy of Sciences, Institute of Biodiversity and Ecosystem Research, Tsar Osvoboditel Boulevard 1, Sofia, Bulgaria , BG-1000
| | - Dimitar Kozuharov
- Sofia University “St. Kliment Ohridski”, Faculty of Biology, Dragan Tsankov Boulevard 8, Sofia, Bulgaria , BG-1164
| | - Teodora Trichkova
- Bulgarian Academy of Sciences, Institute of Biodiversity and Ecosystem Research, Tsar Osvoboditel Boulevard 1, Sofia, Bulgaria , BG-1000
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Stanachkova M, Kozuharov D, Zlatanova D, Trichkova T. Dynamics of Dreissenaspp. veliger larvae in some Bulgarian reservoirs. BIOTECHNOL BIOTEC EQ 2015. [DOI: 10.1080/13102818.2015.1047180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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