Eutrophication Impacts On Characteristics Of
Natural Organic Matter: A Laboratory Approach
Based On Euglena Gracilis And Microcystis
Aeruginosa Cultivation
Author(s)
M. Leloup, R. Nicolau, V. Pallier & G. Feuillade-Cathalifaud
Abstract
Surface water resources can be largely impacted by recurrent seasonal bloom
phenomena of algae and cyanobacteria. Algal Organic Matter (AOM) generated
presents different composition and properties from that of Natural Organic
Matter (NOM). The objective of this work was thus to characterize AOM
generated by an alga, Euglena gracilis, and a cyanobacteria, Microcystis
aeruginosa, and to evaluate its impacts on NOM during and after eutrophication.
The alga and the cyanobacteria were cultivated in laboratory experiments and the
evolution of AOM characteristics during the different growth phases were
assessed by organic matter fractionation according to hydrophobicity and
Specific UV Absorbance (SUVA) determination. The AOM characteristics were
then compared to those of NOM from both an eutrophic pond and a river. The
AOM characteristics were both algal species and growth phase dependent.
During lag and exponential phases, AOM was hydrophilic and mainly produced
by metabolic activity. During stationary and decline phases, the percentages of
hydrophobic and transphilic compounds progressively increased because of cell
mortality. In natural water, the percentage of hydrophilic compounds reached
10–30% of the DOM. In this study this percentage reached more than 50% for
AOM during the decline phase for both species and 45% for NOM of an
eutrophic pond during summer, when phytoplanktonic contribution was
maximum. The fractionation of OM according to hydrophobicity can thus be
used to identify and differentiate the eutrophication origin of OM.
Keywords: eutrophication, organic matter, fractionation, SUVA.
Keywords
Keywords: eutrophication, organic matter, fractionation, SUVA.
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