INFLUENCE OF CYANOBACTERIAL BLOOM ON FRESHWATER BIOCOENOSIS. USE OF BIOASSAYS FOR CYANOBACTERIAL MICROCYSTINS TOXICITY ASSESSMENT
Journal Title: Civil and Environmental Engineering Reports - Year 2017, Vol 1, Issue 24
Abstract
The issues presented in this study concern a very important problem of the occurrence of cyanobacterial blooms in surface water used for water supply purposes. The objective of this study was to analyze the occurrence of cyanotoxic risk in the catchment area of the Obrzyca River (including Sławskie lake which is the beginning of the river), which is a source of drinking water for the inhabitants of Zielona Góra. In order to evaluate toxicity of cyanobacterial bloom it was conducted toxicological testing using aquatic invertebrates (Daphnia magna, Dugesia tigrina) and heterotrophic bacteria (Escherichia coli, Enterococcus faecalis, Pseudomonas fluorescens). Test samples were collected from May to October, 2012. The most toxic was a sample collected from Lake Sławskie on 20th October when cyanobacteria bloom with a predominance of Microcystis aeruginosa occurred and the amount of microcystins was the largest. The methanol extract of the sample was toxic only above a concentration of 6·103 mg·dm-3 . The lethal concentration (48-h LC 50) for Daphnia magna was 3.09·103 and for Dugesia tigrina (240-h LC 50) 1.51·103 mg·dm-3 of microcystins (MC-LR, MC-YR and MC-RR). The same extract stimulated growth of Escherichia coli and Enterococcus faecalis cells.
Authors and Affiliations
Marlena PIONTEK, Wanda CZYŻEWSKA
Keywords
Related Articles
- EP ID EP243251
- DOI -
- Views 44
- Downloads 0
Spatial distribution of iron and aluminum in pore water and bottom sludge of the meromictic acid lake no 54, Łuk Mużakowski, Poland
The spatial distribution of iron and aluminum in bottom sludge and pore water of the meromictic acid pit lake no 54 situated in Łuk Mużakowski, Poland were examined. Samples were taken three times from two places located...
NUMERICAL ANALYSIS OF PREFABRICATED STEEL-CONCRETE COMPOSITE FLOOR IN TYPICAL LIPSK BUILDING
The aim of the work was to perform numerical analysis of a steel-concrete composite floor located in a LIPSK type building. A numerical model of the analytically designed floor was performed. The floor was in a six-store...
Hydraulic research for successful fish migration improvement – ”nature-like” fishways
This article presents an overview of the design solutions for fishways which are locates nearby hydrotechnical constructions. Currently fashionable and recommended hydraulic design of fishways are moving towards "close t...
SCAFFOLDINGS USED DURING THE RENOVATION OF THE METROPOLITAN CATHEDRAL OF ST. JOHN THE BAPTIST AND ST. JOHN THE EVANGELIST IN LUBLIN
This article describes three cases of scaffolding use as a structure for carrying out a renovation work at the Cathedral in Lublin. In order to achieve optimum access to the object, one used modular scaffolding. This typ...
EXAMPLES OF SOLUTIONS FOR STEEL-CONCRETE COMPOSITE STRUCTURES IN BRIDGE ENGINEERING
The aim of the article [1] was to discuss the application of steel-concrete composite structures in bridge engineering in the aspect of structural design, analysis and execution. It was pointed out that the concept of st...