Collapse of a Planktothrix agardhii perennial bloom and microcystin dynamics in response to reduced phosphate concentrations in a temperate lake

Planktothrix agardhii dynamics, microcystin concentration and limnological variables were monitored every 2 weeks for 2 years (2004-2006) in a shallow hypereutrophic artificial lake (BNV, Viry-Châtillon, France). Time-series analysis identified two components in the P. agardhii biomass dynamics: (1)...

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Bibliographic Details
Published in:FEMS microbiology ecology 2008-07, Vol.65 (1), p.61-73
Main Authors: Catherine, Arnaud, Quiblier, Catherine, Yéprémian, Claude, Got, Patrice, Groleau, Alexis, Vinçon-Leite, Brigitte, Bernard, Cécile, Troussellier, Marc
Format: Article
Language:English
Subjects:
Animals
Artificial lakes
Biomass
Collapse
Cyanobacteria - growth & development
Cyanobacteria - metabolism
Dynamics
Ecology
Ecosystem
Equivalence
France
Fresh Water - chemistry
Fresh Water - microbiology
Freshwater
Gene Expression Regulation, Bacterial
Life Sciences
Microbiology
Microbiology and Parasitology
microcystin
Microcystins
Microcystins - metabolism
Microcystins - toxicity
Models, Biological
Periodicity
Phosphates - analysis
Phosphates - metabolism
Phytoplankton - growth & development
pico- and nanophytoplankton
Planktothrix agardhii
Seasonal variations
shallow lake
statistical modeling
Subpopulations
Surface water
Time series
Toxins
Zooplankton
Zooplankton - growth & development
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Summary:Planktothrix agardhii dynamics, microcystin concentration and limnological variables were monitored every 2 weeks for 2 years (2004-2006) in a shallow hypereutrophic artificial lake (BNV, Viry-Châtillon, France). Time-series analysis identified two components in the P. agardhii biomass dynamics: (1) a significant decreasing trend in P. agardhii biomass (65% of the overall variance) and (2) a residual component without significant seasonal periodicity. A path-analysis model was built to determine the main factors controlling the P. agardhii dynamics over the period studied. The model explained 66% of P. agardhii biomass changes. The decreasing trend in P. agardhii biomass was significantly related to a decrease in the PO₄³⁻ concentration resulting from an improved treatment of the incoming watershed surface water. The residual component was related to zooplankton dynamics (cyclopoid abundances), supporting the hypothesis of a top-down control of P. agardhii, but only when the biomass was low. Forty-nine percent of the variability in the microcystin (MC) concentration (min:
ISSN:0168-6496
1574-6941
DOI:10.1111/j.1574-6941.2008.00494.x