Water Science & Technology Vol 42 No 10 pp 171–178 © IWA Publishing 2000
Relationships between bacteria and cyanobacteria in the Marrakech waste
stabilisation ponds
K Oufdou*, N Mezrioui**, B Oudra***, M Barakate****, M Loudiki***** and A Ait Alla******
*
Microbiology Laboratory, Cadi Ayyad University,
Faculty of Sciences-Semlalia, Department of Biology,
P.O. Box S15, Marrakech 40 000, Morocco.
**
Microbiology Laboratory, Cadi Ayyad University,
Faculty of Sciences-Semlalia, Department of Biology,
P.O. Box S15, Marrakech 40 000, Morocco.
***
Algology Laboratory, Cadi Ayyad University, Faculty of Sciences-Semlalia,
Department of Biology, P.O. Box S15, Marrakech 40 000, Morocco.
****
Microbiology Laboratory, Cadi Ayyad University,
Faculty of Sciences-Semlalia, Department of Biology,
P.O. Box S15, Marrakech 40 000, Morocco.
*****
Algology Laboratory, Cadi Ayyad University, Faculty of Sciences-Semlalia,
Department of Biology, P.O. Box S15, Marrakech 40 000, Morocco.
******
Microbiology Laboratory, Ibnou Zohr University, Faculty of Sciences,
Department of Biology, P.O. Box S28, Agadir, Morocco.
ABSTRACT
In waste stabilisation pond systems the interactions between algae and
bacteria have an important ecological effect and appeared to play a key
role in the self-purification process. The aim of the present study is to
evaluate the interactions between two axenic cyanobacteria: Synechocystis
sp. and Pseudanabaena sp. with heterotrophic bacteria and some pathogenic
bacteria: E. coli, Salmonella sp. and non-O1 V. cholerae. The results
obtained showed that Synechocystis sp. (planktonic cyanobacterium) and
Pseudanabaena sp. (benthic cyanobacterium) stimulated the growth and the
survival of heterotrophic bacteria and non-O1 V. cholerae and reduced the
survival of E. coli and Salmonella. Blooms of these cyanobacteria during
hot periods which are a particularity in stabilisation ponds of Marrakech,
could explain the dynamics of bacteria studied in this sewage treatment
process. The presence of heterotrophic bacteria, showing relative high
densities during hot periods, could be considered as an important bioticfactor which led to the cyanobacteria blooms in the Marrakech ponds which
function under an arid Mediterranean climate.
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