Assessment of the Ecological Status of "Dalgachka" River in its Section within the Protected Site "Ovcharovo", (NE Bulgaria)
Dimitar D. Doichev1*, Pilar J. Santander2, Teodora V. Koynova1, Milen S. Petkov3, Nikolay D. Natchev1,4
1 – University of Shumen "Konstantin Preslavski", Faculty of Natural Sciences, Department of Biology, Shumen, BULGARIA
2 – University of Cordoba, Cordoba, SPAIN
3 – Shumen Regional Laboratory at the Environmental Executive Agency, Shumen, BULGARIA
4 – Vienna University, Department of Integrative Zoology, Vienna, AUSTRIA
*Corresponding author:
Abstract. Hydrobiological monitoring and assessment of the ecological status of Dalgachka River and an ecological potential assessment based on abiotic metrics of Ovcharovo dam, was performed in the region of Protected Site "Ovcharovo" in 2017 and 2018. The ecological status assessment was based on the macroinvertebrate community as a bio-indicator and the measurement of the supportive physicochemical and hydrological parameters of the water (according Water frame directive and Bulgarian legislation). The water basins fall into Ecoregion 12 - Pontic province and Black Sea River Basin. To date no recorded indices/parameters or sample collection from Dalgachka River and dam Ovcharovo were obtained, despite such data are required for the purposes of the ecological status/potential assessment. In the present study we assessed for the first time the ecological status of the river section which passes through Protected Site "Ovcharovo" - BG0002093 and provide supportive physico-chemical parameters of the superficial waters in Ovcharovo dam. The river/dam ecosystem is of moderate ecological status, because of high concentration of nitrates and BOD5 in the dam and phosphorus, phosphates and BOD5 in the river section. The ecological status assessment conducted in the spring of 2017 at sample site 1 showed moderate status and at sample site 2 the ecological status was assessed as good, according to Biotic index. Additionally, we established a georeferenced database which can be used as a reference base for the further research on the protected site, but can also serve the purposes of the ecological decision making for the area.
Key words: ecological status assessment, macrozoobenthos, river dam system, protected areа, water physicocemistry, water dependent Natura 2000 site.

Ecologia Balkanica, 2020, Volume 12, Issue 1 pp. 76-84
Article № eb.20117 [Full text - PDF]pdf

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