Diversity and toxin content of cyanobacteria in fish ponds (South Moravia, Czech Republic) related to fishery management intensity
2008
Kopp, R.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Zikova, A.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Mares, J.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Zoologie, Rybarstvi, Hydrobiologie a Vcelarstvi | Navratil, S.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Ustav Veterinarni Ekologie a Ochrany Zivotniho Prostredi | Adamovsky, O.,Masarykova Univ., Brno (Czech Republic). Centrum pro Cyanobakterie a Jejich Toxiny | Palikova, M.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Ustav Veterinarni Ekologie a Ochrany Zivotniho Prostredi
During the vegetative period of the year 2005 (June-October) we carried out hydrobiological and hydrochemical monitoring of selected ponds in Southern Moravia in relation to different fishery management intensities. Water temperature, dissolved oxygen content, pH, conductivity, water transparency, concentrations of N-NH4+, N-NO2-, N-NO3-, P-PO4,3-, chlorophyll a and cyanotoxins were measured. Samples of phytoplankton were analyzed for species composition. All ponds were characterized by low water transparency, high values of pH as well as concentrations of N-NH4+, P-PO4,3- and chlorophyll a. We detected maximum concentration of 18.7 microg/L microcystins in ponds dominated by the species Microcystis aeruginosa. The total microcystin concentration in water of all ponds with dominance of pikoplanktonic cyanobacteria were below the detection limit (0.125 microg/L). The dominance of cyanobacteria species shifts from coccal (especially genus Microcystis) to small-colonial pikoplanctonic (genus Aphanocapsa, Aphanothece) and to single-filamentous (genus Planktothrix, Limnothrix, Pseudanabaena) cyanobacteria related to increasing fish stock density.
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