title: The influence of hydrological conditions on phytoplankton community structure and cyanopeptide concentration in dammed lowland river.
abstract: Study results show continuous summer-autumn dominance of toxic cyanobacteria in plankton not only in the strongly eutrophicated lowland Siemianówka reservoir, but also along 130 km of Narew river below the lake. The negative effects of eutrophication of the reservoir reach far outside its boundaries. One of the symptoms of eutrophication was a mass development of cyanobacteria, including the toxin-producing Planktothrix agardhii. In the reservoir, the biomass of the species strongly correlated with the concentration of microcystins. Redundancy analysis (RDA) identified seven environmental variables as significantly influencing phytoplankton composition in the Narew river: discharge, conductivity, temperature, dissolved oxygen, orthophosphates, silicate ions, and total phosphorous. Higher discharge in the river and higher rates of flushing induced faster dilution of limnoplankton in downstream river and had positive effects on the decrease of cyanobacterial biomass and microcystin concentration.
authors.affiliation: Department of Hydrobiology, University of Białystok, Ciołkowskiego1J, 15-245, Białystok, Poland. magra@uwb.edu.pl.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Grabowska
authors.affiliation: Department of Marine Biotechnology, University of Gdańsk, Al. Marszałka Piłsudskiego 46, 81-378, Gdynia, Poland.
authors.forename: Hanna
authors.initials: H
authors.lastname: Mazur-Marzec
mesh_terms: D018533:Biomass; D000458:Cyanobacteria / Q000254:growth & development*; D004784:Environmental Monitoring / Q000379:methods*; D005068:Eutrophication; D062070:Hydrology; D052998:Microcystins / Q000032:analysis*; D010839:Phytoplankton / Q000254:growth & development / Q000382:microbiology*; D011044:Poland; D045483:Rivers / Q000737:chemistry* / Q000382:microbiology; D012621:Seasons; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D052998:Microcystins; D014874:Water Pollutants, Chemical; C078588:microcystin
keywords: Dammed river; Discharge; Phytoplankton; Toxic cyanobacteria