TRACE ELEMENT KINETICS IN CONTAMINATED POSIDONIA OCEANICA MEADOW J. Richir, N. Luy, G. Lepoint, A....
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![Page 1: TRACE ELEMENT KINETICS IN CONTAMINATED POSIDONIA OCEANICA MEADOW J. Richir, N. Luy, G. Lepoint, A. Alvera Azcarate, R. Biondo, S. Gobert Essaouira 05-2012.](https://reader035.fdocuments.in/reader035/viewer/2022070401/56649f215503460f94c39a15/html5/thumbnails/1.jpg)
TRACE ELEMENT KINETICS IN CONTAMINATED POSIDONIA OCEANICA MEADOW
J. Richir , N. Luy , G. Lepoint, A. Alvera Azcarate, R. Biondo, S. Gobert
Essaouira05-2012
![Page 2: TRACE ELEMENT KINETICS IN CONTAMINATED POSIDONIA OCEANICA MEADOW J. Richir, N. Luy, G. Lepoint, A. Alvera Azcarate, R. Biondo, S. Gobert Essaouira 05-2012.](https://reader035.fdocuments.in/reader035/viewer/2022070401/56649f215503460f94c39a15/html5/thumbnails/2.jpg)
Mediterranean submitted to anthropic pressures
Introduction
INTRODUCTION
bioindicator : Posidonia oceanica- monitoring of coastal ecosystem pollution;- representative accumulation;- pollutant biologically accessible.
pollution trace elements (TEs)
TE Cd Pb Cu Zn Cr Fe Ni
# ref. 39 30 28 26 23 15 14
TE As Ag Co Mn Al Bi V Mo
# ref. 4 3 3 3 2 1 1 1
Luy et al. (2012)
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Mediterranean submitted to anthropic pressures
Introduction
INTRODUCTION
bioindicators : Posidonia
oceanica
pollution trace elements (TEs)
TEs uptake and loss kinetics of P. oceanica contaminated in their natural environment?
e.g.: Ledent (1992); Warnau et al. (1996)
![Page 4: TRACE ELEMENT KINETICS IN CONTAMINATED POSIDONIA OCEANICA MEADOW J. Richir, N. Luy, G. Lepoint, A. Alvera Azcarate, R. Biondo, S. Gobert Essaouira 05-2012.](https://reader035.fdocuments.in/reader035/viewer/2022070401/56649f215503460f94c39a15/html5/thumbnails/4.jpg)
Mediterranean submitted to anthropic pressures
Introduction
INTRODUCTION
bioindicators : Posidonia
oceanica
pollution trace elements (TEs)
TEs uptake and loss kinetics of P. oceanica contaminated in their natural environment?
Objectives:
To study TEs kinetics and tissue compartmentalization of P. ocenica contaminated in situ at 2 experimental levels:
- moderate: 21x Calvi SW conc.; 4x world ocean mean conc. - acute: 151x Calvi SW conc.; 31x world ocean mean conc.
e.g.: Ledent (1992); Warnau et al. (1996)
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In situ experimental contaminations
MATERIAL - METHODS
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MATERIAL
-
METHODS
Contamination at moderate levels
• 5 days of contamination in June 2009;
• 410L bell-shaped mesocosm;
• Contamination every 12 hours (9am-9pm);
• 15 days of decontamination.
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MATERIAL
-
METHODS
Contamination at moderate levels
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MATERIAL
-
METHODS
Contamination at acute levels
• 24h00 of contamination in June 2009;
• 54L rectangular-box mesocosm;
• 5 contaminations, 1 every 3 hours (9am-9pm);
• 15 days of decontamination
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Posidonia oceanica
(A) shoot of leaves on a plagiotropic rhizome (Rz); (B, C) adult leaves (AL); (D) intermediate leaf (IL); (E) juvenile leaf. Libes and Boudouresque,1987
plagiotropic shoot
orthotropic shoot
rhizome
blade
roots
MATERIAL
-
METHODS
limb
ligula
leaf base (petiole)
EDCB
A
rootleaf base
stipule
scale
rhizome
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RESULTS
Ag moderate conta.: kinetics
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RESULTS
Ag moderate conta.: kinetics
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RESULTS
Ag moderate conta.: kinetics
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RESULTS
Ag moderate conta.: kinetics
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RESULTS
Ag moderate conta.: compartmentalization
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RESULTS
Ag moderate conta.: compartmentalization
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RESULTS
Ag moderate conta.: kinetics
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RESULTS
Ag acute conta.: kinetics
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RESULTS
Ag acute conta.: kinetics
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RESULTS
Ag acute conta.: kinetics
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RESULTS
Ag acute conta.: compartmentalization
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RESULTS
Ag acute conta.: compartmentalization
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RESULTS
Ag acute conta.: kinetics
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CONCLUSION
Conclusion
• P. oceanica takes up TEs from the beginning of experiments;
• Moderate contamination design are preferred;
• Once contaminations end, TE concentrations rapidly decrease;
• Leaves exhibited different uptake kinetics: the younger growing leaves forming new tissues incorporated chemicals more rapidly than the older senescent leaves;
• Rhizomes did not show any clear trend.
P. oceanica is a sensitive sentinel to delineate punctual pollutions similar to what might be measured in contaminated Mediterranean waters routine use in regularly scheduled monitoring programs.
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QUESTIONS
Thank you for your attention
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RESULTS
Cu moderate conta.: kinetics
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RESULTS
Cu moderate conta.: compartmentalization
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RESULTS
Cu moderate conta.: kinetics
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RESULTS
Cu acute conta.: kinetics
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RESULTS
Cu acute conta.: compartmentalization
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RESULTS
Cu acute conta.: kinetics
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RESULTS
Fe moderate conta.: kinetics
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RESULTS
Fe moderate conta.: compartmentalization
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RESULTS
Fe moderate conta.: kinetics
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RESULTS
Fe acute conta.: kinetics
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RESULTS
Fe acute conta.: compartmentalization
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RESULTS
Fe acute conta.: kinetics
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Analytical steps:
• homogeneous sample
• acidic digestion in a microwave oven
• measures : inductively coupled plasma mass spectrometer
MATERIAL
-
METHODS
Laboratory analyses
Ethos D
ELAN DRCII
adult leavesshoots 1/6/9
Calvi