Temporal and spatial distribution of faecal bacteria in a Moroccan Lagoon
The origin and distribution of microbial contamination in Oualidia lagoon were assessed using faecal coliform and streptococci bacteria. The lagoon is used for recreation, oyster farming, and fishing. Samples were collected from 9 different sites, and physicochemical and microbiological analyses were performed monthly during 2 years (October 2003-0ctober 2005). These samples were subjected to bacteriological analysis faecal coliform count and faecal streptococcal count. The physicochemical analysis of the water samples includes pH, temperature, and specific conductance. The bacterial genera were identified on the basis of their morphological and physiological characteristics. The present study confirmed the presence of bacterial indicators of faecal origin at various stations in every stretch of the Oualidia lagoon system. The samples collected from different sites of the lagoon showed wide variations in the counts of bacteria. The Bacterial population varied with seasonal variations in the water body. The Faecal coliform counts increase during the summer months and decrease during winter. The opposite happens for streptococci bacteria, which increase during winter and decrease during the summer, depending on rainfall. Positive correlation was established between faecal coliform and streptococci bacteria. The results of bacteriological analysis of water revealed that the situation is alarming. The Bacteriological analysis of lagoon water indicated that water was polluted by faecal contaminants to the extent that it was unsuitable for recreation and hence needed thorough impoundment.
- 1. FAULKNER H, EDMONDS-BROWN V., GREEN A. Problems of quality designation in diffusely polluted urban streams. The case of Pymme's Brook. North London. Environ. Pollut. 109, (1), 91, 2000.
- 2. MAANAN M. Trace metal contamination of marine organisms from the Moroccan North Atlantic coastal environments. Environ. Pollut. 153, (1), 176, 2008.
- 3. DHAGE S.S., CHANDORKAR A.A., KUMAR R, SRI- VASTAVA A., GUPTA I. Marine water quality assessment at Mumbai West Coast. Environ. Int. 32, 149, 2006.
- 4. AFFIAN K., ROBIN M., MAANAN M., DIGBEHI B., DJAGOUA É.V., KOUAME F. Heavy metal and polycyclic aromatic hydrocarbons in Ebrié lagoon sediments, Côte d'Ivoire. Environ. Monit. Assess. 159, 531, 2009.
- 5. KAY D., AITKEN M., CROWTHER J., DICKSON I., EDWARDS A.C., FRANCIS C, HOPKINS M., JEFFREY W., KAY C, MCDONALD A.T., MCDONALD D., STAPLETON C.M., WATKINS J., WILKINSON J., WYER M.D. Reducing fluxes of faecal indicator compliance parameters to bathing waters from diffuse agricultural sources: The Brighouse Bay study, Scotland. Environ. Pollut. 147, (1), 138, 2007.
- 6. DUFOUR A.P. Escherichia coli: the faecal coliform. In: Hoadley, A.W., Dutka, B.J. (Eds.), Bacterial Indicators/Health Hazards Associated with Water. ASTM STP635. American Society for Testing and Materials. West Conshohocken. PA, pp. 48-58,1977.
- 7. ROMALD J. L., AREA E., SANCHEZ G., RIBAO C., TORRADO I., ABAD X., PINTO R. M., BARJA J. L., BOCSH A. Prevalence of enterovirus and Hepatitis A virus in bivalve molluscs from Galicia (NW Spain): Inadequacy of the EU standards of microbiological quality. Int. J. Food Microbiol. 74, 119, 2002.
- 8. RODGERS P., SOULSBY C„ HUNTER C., PETRY J., Spatial and temporal bacterial quality of a lowland agricultural stream in northeast Scotland. Sci. Total Environ. 289- 302,314, 2003.
- 9. VINTEN A.J.A., DOUGLAS J.T., LEWIS D.R., AITKEN M.N., FENLON D.R. Relative risk of surface water pollution by E. coli derived from faeces of grazing animals compared to slurry application. Soil Use Management. 20, (1), 13,2004.
- 10. ASQAAC. Australian shellfish quality assurance program (ASQAP) operations manual.http://www.pir.sa.gov.au/ byteserve/aquaculture/sasqap/asqap_manual_final. Pdf. 2002.
- 11. CFIA., DFO., EC. Canadian shellfish sanitation program, manual of operations. Canadian Food Inspection Agency. Department of Fisheries and Oceans and Environment Canada. 2004.
- 12. LEE R. J., YOUNGER A. Developing microbiological risk assessment for shellfish purification. Int. Biodeter. Biodegr. 50, 177, 2002.
- 13. MALLIN M.A., ENSIGN S.H., MCIVER M.R., SHANK G.C., FOWLER P.K. Demographic, landscape, and meteorological factors controlling the microbial pollution of coastal waters. Hydrobiologia. 460, (1-3), 185, 2001.
- 14. El ATTAR J., ASSOBHEI O. Study of faecal pollution in a Moroccan oyster growing area (Oualidia lagoon). Marine Life. 11,(1-2), 39, 2001.
- 15. BENNOUNA A., BERLAND B., El ATTAAR J., ASSOBHEI O. Lingulodinium polyedrùm (Stein) Dodge red tide in shellfish areas along Doukkala coast (Moroccan Atlantic). Oceanologica Acta. 25, 159, 2002.
- 16. APHA. American Public Health Association, American Water Works Association, Water Environment Federation. Standard Methods for the Examination of Water and Wastewater, 20th edition. 1999.
- 17. MEHAFFY M. H., NASH M. S., WADE.T. G., EBERT D. W., JONES K. B.; RAGER A. Linking Land Cover and Water Quality in New York City.s Water Supply Watersheds. Environ. Monit. Assess. 107, 29, 2005.
- 18. NELSON ERIN J., BOOTH DEREK B. Sediment Sources in an Urbanizing, Mixed Land-Use Watershed. J. Hydrol. 264, (1-4), 51, 2002.
- 19. HUNTER C., PERKINS J., TRANTER J., GUNN J. Agricultural land-use effects on the indicator bacterial quality of an upland stream in the Derbyshire Peak District in the UK. Water Res. 33, 3577,1999.
- 20. CHIGBU P., GORDON S., STRANGE T.R. Faecal coliform bacteria disappearance rates in a north-central Gulf of Mexico estuary. Estuar. Coast. Shelf. S. 65, (1-2), 309, 2005.
- 21. SCHOONOVER JON E., LOCKABY B. GRAEM E., SHUFEN PAN. Changes in Chemical and Physical Properties of Stream Water Across an Urban-Rural Gradient in Western Georgia. Urban Ecosystems. 8, 107, 2005.
- 22. MALLIN M.A., WILLIAMS K. E., ESHAM E., CARTIER E. Effect of Human Development on Bacteriological Water Quality in Coastal Watersheds. Ecol. Appl. 10, (4), 1047, 2000.
- 23. YOUNG KATHERINE D., THACKSTON EDWARD L. Housing Density and Bacterial Loading in Urban Streams. J. Environ. Eng. 125, (12), 1177,1999.
- 24. KISTEMANN T, CLABEN T., KOCH C, DANGENDORF F., FISCHEDER R., GEBEL J., VACATA V., EXNER M. Microbial load of drinking water reservoir tributaries during extreme rainfall and runoff. Appl. Environ. Microbiol. 68,2188, 2002.
- 25. CROWTHER J., KAYD., WYER M. D. Faecal-indicator concentrations in waters draining lowland pastoral catchments in the UK: relationships with land use and farming practices. Water Res. 36, 1725, 2002.
- 26. NOBLE R.T., FUHRMAN J.A. Enteroviruses detected by reverse transcriptase polymerase chain reaction from the coastal waters of Santa Monica Bay, California: low correlation to bacterial indicator levels. Hydrobiologia. 460, 175, 2001.