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Open Life Sciences

formerly Central European Journal of Biology

Editor-in-Chief: Ratajczak, Mariusz


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Volume 5, Issue 2

Issues

Volume 10 (2015)

Phytoplankton community of the drinking water supply reservoir Borovitsa (South Bulgaria) with an emphasis on cyanotoxins and water quality

Ivanka Teneva / Rumen Mladenov / Detelina Belkinova / Ivanka Dimitrova-Dyulgerova / Balik Dzhambazov
Published Online: 2010-03-03 | DOI: https://doi.org/10.2478/s11535-010-0009-1

Abstract

The phytoplankton diversity, algal biomass, and selected physicochemical parameters were investigated in the drinking water reservoir (Borovitsa) located in the Kardzhali region, Bulgaria. Particular attention was given to Cyanoprokaryota and presence of cyanotoxins in the water samples. Twenty-nine species belonging to six divisions (Cyanoprokaryota, Chlorophyta, Zygnemophyta, Dinophyta, Euglenophyta and Bacillariophyta) were identified. The microscopic examination of the phytoplankton samples showed the dominance of Ankyra judayi, Oocystis lacustris (Chlorophyta) and Aphanizomenon flos-aquae (Cyanoprokaryota) in July 2006, and Microcystis pulverea, Synechococcus elongatus (Cyanoprokaryota), Radiococcus planktonicus (Chlorophyta) and Melosira varians (Bacillariophyta) in September 2006. A blooming event due to Aphanizomenon flos-aquae was observed in July 2006. The reservoir exhibits a tendency to shift from an oligotrophic environment to a state of mesotrophy. Presence of cyanotoxins such as anatoxin-a, microcystins and saxitoxins were analyzed by HPLC and ELISA methods. Our results demonstrated the presence of anatoxin-a and microcystins (0.09 µg/L) in the raw water samples from July 2006, and saxitoxins (2.5 µg/L) and microcystins (0.18 µg/L) in the raw water samples from September 2006. The study underlines that permanent monitoring programs of Cyanoprokaryota in the reservoirs used as sources of drinking water and toxicity assessments should be implemented. Indirect exposure and transfer of cyanotoxins through food chains must also be considered.

Keywords: Borovitsa reservoir; Cyanoprokaryota; Drinking water; Microcystins; Phytoplankton; Saxitoxins

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About the article

Published Online: 2010-03-03

Published in Print: 2010-04-01


Citation Information: Open Life Sciences, Volume 5, Issue 2, Pages 231–239, ISSN (Online) 2391-5412, DOI: https://doi.org/10.2478/s11535-010-0009-1.

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© 2010 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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