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Reference lake in Wallonia: Falemprise. Catchment ara = 4164 ha. Surface area = 47 ha Max. depth = 6 m. Lake Falemprise is one of the Eau d’Heure Lakes and is an official swimming area in the Walloon Region.

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slide1

Reference lake in Wallonia: Falemprise

Catchment ara = 4164 ha

Surface area = 47 ha

Max. depth = 6 m

Lake Falemprise is one of the Eau d’Heure Lakes and is an official swimming area in the Walloon Region.

Therefore, this lake is monitored for microbiological quality by the Walloon authorities.

slide2

Other taxa present in the samples : Microcystis aeruginosa, Anabaena sp and Limnothrix sp, with Gomphosphaeriumsp and Aphanocapsa sp more sporadically. In 2008, no Planktothrix, but Microcystis

slide3

BLOOMNET in Wallonia

Bambois, July 2008

Microcystin in Ri Jaune, 2009

subcontract with aquapole ulg model simulations
Subcontract with Aquapole – ULgModel simulations

Phosphorus reductions (external loading) will help reduce cyanobacteria blooms

Hydrometeorology 2002

Releases 2002 and 2015

Hydrometeorology 2007

Releases 2007 and 2015

slide5

Groupe II Planktothrix

Groupe I Nostocales

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Groupe III Picocyanobactéries

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Groupe IV Microcystis

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Groupe V Woronichinia

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Groupe VI Snowella

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Groupe VII Pseudanabaena/

Limnothrix

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Genetic diversity of cyanobacteria in Belgian waterbodies (2007)

In Falemprise, Chérapont, Ecaussines, Ixelles pond II

16S rRNA sequences obtained by

DGGE (blue)

Green and brown sequenceswere previously found in Belgium

3 groups are forming blooms and are potentially toxic in Belgian waterbodies

? Invasive species?

slide6

2007

2008

mcyA

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mcyE

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Cyano

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Toxin gene detection during a 2-years survey in lake Falemprise

  • mcy geneswere always detected when the toxin seems to be in the
  • cyanobacterial cells/biomass
  • mcy genes were detected even when the biomass was low in 2008
  • = Efficient early warning tool

Particulate MC-LR

Soluble MC-LR

slide7

Park Westveld, Sint-Amandsberg

  • 99 samples (2007-2008, 2009)
  • microscopical analysis:
  • cyanobacteria
  • phytoplankton
  • grazers and parasites
  • molecular analysis Microcystis
  • (ITS rDNA)
slide10

First detection of Cylindrospermopsis raciborskii

in Belgium

  • August 2009
  • Zonhoven and Averbode
  • 20 – 27 µg microcystin L-1
slide11

Bruxelles

A large number of ponds

urban context

heavy pollution (nutrients)

high productivity

cyanobacteria Blooms

cyanotoxins present at all times

sometimes at alarming concentrations

slide12

Bruxelles

Before

After

Predictive model

– management tool

Probability of bloom occurrence

Identification of ponds at risk of developing cyanobacteria

setup of monitoring programs

Bloom reduction and restoration of the most affected ponds by approriate techniques

slide13

Total_MC - page 1

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fitted function

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Microcystis.Cyano (97.1%)

ZEU (1.1%)

TP (0.9%)

DIN (0.3%)

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CyanoT2 (0.3%)

NbreClado (0.1%)

NbreGdsClado (0.1%)

CyanoT1 (0%)

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NO3 (0%)

NbreCopépodites (0%)

Planktothrix.Cyano (0%)

NbreCopépodes (0%)

Prediction of microcystin concentration from the B-BLOOMS2 data set method: classification and regression tree (CART)
slide14

In hyper-eutrophic lakes, the best predictor of cyanobacteria biomass is … Total phosphorus

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