Current Ecological Status of Lotic Ecosystems in Vitosha Mountain Reserves (Torfeno Branishte and Bistrishko Branishte)

Radka P. Fikova1, Emilia D. Varadinova1, 2*, Lachezar P. Yakimov1, Lyubomir A. Kenderov3
1 - Bulgarian Academy of Sciences, Institute of Biodiversity and Ecosystem Research, Department ofAquatic Ecosystems, 2 Gagarin St. 1113 Sofia, BULGARIA
2 - South-West University "Neofit Rilski", Faculty of Mathematics and Natural Sciences, Department Geography, Ecology and Environmental Protection,
66 Ivan Michailov St. 2700 Blagoevgrad, BULGARIA
3 - Sofia University "St. Kliment Ohridski", Faculty of Biology, 1164 Sofia, 8 Dragan Tsankov Blvd., Bulgaria
*Corresponding author:
Abstract. The national legislation on surface waters characterization (Regulation N4/2012) was applied for the lotic ecosystems in Torfeno Branishte (Vladayska and Boyanska Rivers) and Bistrishko Branishte Reserves (Bistritsa and Yanchovska Rivers) in view of ecological status assessment. Water samples were collected and analysed both for physicochemical elements (pH, dissolved oxygen, conductivity, biological oxygen demand, nitrate and ammonium nitrogen, chlorides, sulphates) and macrozoobenthos (by calculating the regulated indices Total number of taxa and Biotic index). The assessment based on Total Number of Taxa, Biotic index and the supporting physicochemical parameters showed a "good" and "high" ecological status for four rivers. The results obtained for the representative studied water bodies, can be utilized in decision- making process to insure the relevant measures for prevention the anthropogenic pressure and further maintaining the high water quality of the aquatic ecosystems in the two reserves.
Key words:  reserves, macrozoobenthos, biological quality element, physicochemical elements, rivers, ecological status.

Ecologia Balkanica, 2019, Special Edition 2, pp. 9-14
Article № eb.19SE203 [Full text - PDF]pdf

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