Effects of fish elimination on the phytoplankton community of a eutrophic lake

1984 ◽  
Vol 22 (1) ◽  
pp. 649-657 ◽  
Author(s):  
Helge Reinertsen ◽  
Yngvar Olsen
Keyword(s):  
Phytoplankton Community ◽  
Eutrophic Lake

scholarly journals Effects of DOC addition from different sources on phytoplankton community in a temperate eutrophic lake: An experimental study exploring lake compartments

2021 ◽  
pp. 150049
Author(s):  
Bárbara Medeiros Fonseca ◽  
Eti Ester Levi ◽  
Lea Westphalen Jensen ◽  
Daniel Graeber ◽  
Martin Søndergaard ◽  
...  
Keyword(s):  
Experimental Study ◽  
Phytoplankton Community ◽  
Eutrophic Lake ◽  
Different Sources

Food spectrum of the omnivorous rotifer Asplanchna priodonta in two large northeastern European lakes of different trophy

2013 ◽  
Vol 42 (3) ◽  
Author(s):  
Katarina Oganjan ◽  
Taavi Virro ◽  
Velda Lauringson
Keyword(s):  
Phytoplankton Community ◽  
Stomach Contents ◽  
Eutrophic Lake ◽  
Phytoplankton Community Structure ◽  
Potential Prey ◽  
Lake Peipsi ◽  
Large Lakes ◽  
Lake Võrtsjärv ◽  
Asplanchna Priodonta ◽  
Rare Occasion

AbstractIn this paper we examine the stomach contents of the omnivorous rotifer, Asplanchna priodonta, to evaluate possible trophic interactions between this rotifer and its potential prey in two large northeastern European lakes: moderately eutrophic Lake Peipsi and strongly eutrophic Lake Võrtsjärv. Our results show that the A. priodonta diet consisted of Bacillariophyta, Chlorophyta, Cyanobacteria, and Dinoflagellata. Ciliata were detected on rare occasion. Bacillariophyta were the most frequent food items in stomachs. There were no between-lake differences in the consumption of Chlorophyta and Cyanobacteria, whereas Bacillariophyta were consumed more in Lake Peipsi. However, neither Dinoflagellata nor Ciliata were found in stomach samples in Lake Võrtsjärv. We conclude that A. priodonta is an opportunistic feeder that is capable of influencing the phytoplankton community structure in large lakes.

Influence of extended water column mixing during the first 2 years of hypolimnetic oxygenation on the phytoplankton community of Amisk Lake, Alberta

1997 ◽  
Vol 54 (9) ◽  
pp. 2133-2145 ◽  
Author(s):  
D J Webb ◽  
R D Robarts ◽  
E E Prepas
Keyword(s):  
Water Column ◽  
Trophic Status ◽  
Phytoplankton Community ◽  
Euphotic Zone ◽  
Open Water ◽  
Eutrophic Lake ◽  
Cyanobacterial Blooms ◽  
Chl A ◽  
Hypolimnetic Oxygenation ◽  
Physical Variables

The phytoplankton community, physical variables, and nutrient and chlorophyll a (Chl a) concentrations were monitored during the first two of six open-water seasons of hypolimnetic oxygenation in double-basined Amisk Lake, Alberta. Deep mixing of the water column in the treated basin (Zmax = 34 m) in spring was enhanced by hypolimnetic oxygenation. Oxygenation began in June 1988, when stratification was likely already established, but subsequent year-round treatment favoured an extended spring diatom bloom (Asterionella formosa and Cyclotella spp.), followed by a delay in the development of, and reduction in the severity of, cyanobacterial blooms (Aphanizomenon flos-aquae and Anabaena flos-aquae) in 1989. Historically, mean summer Chl a and total phosphorus (TP) concentrations in the euphotic zone (0-6 m) of the treated basin were 15.9 ± 1.6 and 33.5 ± 1.5 µg ·L-1, respectively, indicating a eutrophic lake. In 1988 and 1989, mean summer Chl a (10.0 ± 0.6 and 8.1 ± 0.7 µg ·L-1, respectively) and TP concentrations (29.0 ± 0.5 and 22.5 ± 0.9 µg ·L-1, respectively) in this stratum were lower than historic values (P < 0.05), indicating that the trophic status of Amisk Lake had shifted towards mesotrophy.

scholarly journals The Effect of a Combined Hydrogen Peroxide-MlrA Treatment on the Phytoplankton Community and Microcystin Concentrations in a Mesocosm Experiment in Lake Ludoš

Toxins ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 725 ◽  
Author(s):  
Dariusz Dziga ◽  
Nada Tokodi ◽  
Damjana Drobac ◽  
Mikołaj Kokociński ◽  
Adam Antosiak ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Phytoplankton Community ◽  
Eutrophic Lake ◽  
Safe Drinking Water ◽  
Environmental Waters ◽  
H2o2 Treatment ◽  
Toxic Metabolites ◽  
Combined Use ◽  
Mesocosm Experiments ◽  
Set Up

Harmful cyanobacteria and their toxic metabolites constitute a big challenge for the production of safe drinking water. Microcystins (MC), chemically stable hepatotoxic heptapeptides, have often been involved in cyanobacterial poisoning incidents. A desirable solution for cyanobacterial management in lakes and ponds would eliminate both excess cyanobacteria and the MC that they potentially produce and release upon lysis. Hydrogen peroxide (H2O2) has recently been advocated as an efficient means of lysing cyanobacteria in lakes and ponds, however H2O2 (at least when used at typical concentrations) cannot degrade MC in environmental waters. Therefore, mesocosm experiments combining the cyanobacteria-lysing effect of H2O2 and the MC-degrading capacity of the enzyme MlrA were set up in the highly eutrophic Lake Ludoš (Serbia). The H2O2 treatment decreased the abundance of the dominant cyanobacterial taxa Limnothrix sp., Aphanizomenon flos-aquae, and Planktothrix agardhii. The intracellular concentration of MC was reduced/eliminated by H2O2, yet the reduction of the extracellular MC could only be accomplished by supplementation with MlrA. However, as H2O2 was found to induce the expression of mcyB and mcyE genes, which are involved in MC biosynthesis, the use of H2O2 as a safe cyanobacteriocide still requires further investigation. In conclusion, the experiments showed that the combined use of H2O2 and MlrA is promising in the elimination of both excess cyanobacteria and their MC in environmental waters.

Climate exerts a greater modulating effect on the phytoplankton community after 2007 in eutrophic Lake Taihu, China: Evidence from 25 years of recordings

2019 ◽  
Vol 105 ◽  
pp. 82-91 ◽  
Author(s):  
Chaoxuan Guo ◽  
Guangwei Zhu ◽  
Boqiang Qin ◽  
Yunlin Zhang ◽  
Mengyuan Zhu ◽  
...  
Keyword(s):  
Phytoplankton Community ◽  
Lake Taihu ◽  
Eutrophic Lake

scholarly journals Cyanobacterial Blooms in Lake Varese: Analysis and Characterization over Ten Years of Observations

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 675 ◽  
Author(s):  
Nicola Chirico ◽  
Diana C. António ◽  
Luca Pozzoli ◽  
Dimitar Marinov ◽  
Anna Malagó ◽  
...  
Keyword(s):  
Algal Blooms ◽  
Phytoplankton Community ◽  
Microscopic Analysis ◽  
Environmental Parameters ◽  
Eutrophic Lake ◽  
Cyanobacterial Blooms ◽  
Weather Forecasts ◽  
Management Actions ◽  
Cyanobacteria Blooms ◽  
Microscopy Analysis

Cyanobacteria blooms are a worldwide concern for water bodies and may be promoted by eutrophication and climate change. The prediction of cyanobacterial blooms and identification of the main triggering factors are of paramount importance for water management. In this study, we analyzed a comprehensive dataset including ten-years measurements collected at Lake Varese, an eutrophic lake in Northern Italy. Microscopic analysis of the water samples was performed to characterize the community distribution and dynamics along the years. We observed that cyanobacteria represented a significant fraction of the phytoplankton community, up to 60% as biovolume, and a shift in the phytoplankton community distribution towards cyanobacteria dominance onwards 2010 was detected. The relationships between cyanobacteria biovolume, nutrients, and environmental parameters were investigated through simple and multiple linear regressions. We found that 14-days average air temperature together with total phosphorus may only partly explain the cyanobacteria biovolume variance at Lake Varese. However, weather forecasts can be used to predict an algal outbreak two weeks in advance and, eventually, to adopt management actions. The prediction of cyanobacteria algal blooms remains challenging and more frequent samplings, combined with the microscopy analysis and the metagenomics technique, would allow a more conclusive analysis.

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