Abstract
Efteni Lake is a small and shallow lake located at the Western Black Sea Region of Turkey that is under severe environmental threat in terms of receiving land-based sources of pollutants especially of diffuse character. No field investigations related to phytoplankton distribution or enteric bacteria in the lake have been conducted prior to this study. To fill this gap in order to better understand the present status of microbiological water quality, the progress of the eutrophication process and to support the investigations relating to the rehabilitation of the lake as well as water quality management, a field study for determining the instantaneous spatial distribution of enteric bacteria and phytoplankton groups has been realized. The results of these investigations indicate that the lake is currently in transition from mesotrophic to eutrophic state. Enteric bacteria with multiple antibiotic resistances that may threat the public health as well as livestock were identified. The antibiotics to which these bacteria were found to be resistant were more commonly used for livestock rather than humans. This finding indicates that livestock is the more important source of faecal contamination than human-based faecal contamination. This study is the first step of a more comprehensive rehabilitation planning study for the lake. Key words: Antibiotic resistance, enteric bacteria, biological water quality, Efteni Lake, eutrophication, phytoplankton distribution.
Highlights
Efteni Lake located at the North-Western part of Turkey within the Western Black Sea Watershed is a small and quite shallow and natural lake with a surface area of 180 ha and an average depth of less than 2 m (Figure 1)
The aim of this study is to better understand the present status of microbiological water quality, the progress of the eutrophication process for supporting the investigations related to the rehabilitation and water quality management in the Efteni Lake
Quantitative data related to enteric bacteria were obtained by multiple tube fermentation method
Summary
Efteni Lake located at the North-Western part of Turkey within the Western Black Sea Watershed is a small and quite shallow and natural lake with a surface area of 180 ha and an average depth of less than 2 m (Figure 1). The lake is an important wetland for birds nesting and breeding. The lake had been larger and deeper years ago and was connected to a stream system. The lake lost most of its surface area after it was drained to gain agricultural land (Figure 2).
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