Back
 GEP  Vol.6 No.2 , February 2018
Impact of Sand Dredging Activities on Ecosystem and Community Survival in Ibeshe Area of Lagos Lagoon, Nigeria
Abstract: This study investigates the impact of sand dredging activities on coastal ecosystem and community survival around Ibeshe area of the Lagos Lagoon, Nigeria. Surface water and bottom sediment samples were collected from locations partitioned into Dredged Area (DA) and Undredged Area (UA) in the lagoon for laboratory analyses. Questionnaires were administered to community dwellers and sand miners to further analyze perception of locals. Significant differences in water quality parameters and sediments properties from Dredged and Undredged areas, and highly significant relationship between sand dredging and unsustainable ecological practices in Ibeshe were observed. One way ANOVA test indicates that all water quality parameters measured with exception of turbidity and nitrate concentration were not significantly different (P > 0.05) between Dredged and Undredged area. With exception of moisture content other sediment parameters measured were not significantly different (P > 0.05) between Dredged and Undredged areas. The project also determined the impact of dredging activities on the fisheries and fishing business in the environment. Turbidity values revealed that fishes will be negatively affected due to dredging activities; moreover dwellers pay little or no attention to conservation of the area due to unawareness. Sand dredging operations negatively influence ecological resources and water composition of the area. This project is designed to randomly sample the opinion of sand mining operators and residents; and questionnaires were administered to obtain data. Strict regulation and enforcement will assist to control ecological destruction and solve problems facing the lagoon environment.
Cite this paper: Adekunbi, F. , Elegbede, I. , Akhiromen, D. , Oluwagunke, T. and Oyatola, O. (2018) Impact of Sand Dredging Activities on Ecosystem and Community Survival in Ibeshe Area of Lagos Lagoon, Nigeria. Journal of Geoscience and Environment Protection, 6, 112-125. doi: 10.4236/gep.2018.62008.
References

[1]   Central Dredging Association (2009) Dredging and the Environment: Moving Sediments in Natural Systems. CEDA Information Paper. The Netherlands.
http://www.dredging.org

[2]   Newell, R.C., Seiderer, L. and Hitchcock, D.R. (1998) The Impact of Dredging Works in Coastal Waters: A Review of the Sensitivity to Disturbances and Subsequent Recovery of Biological Resources in the Seabed. Oceanography Marine Biology Annual Review, 36, 809-818.

[3]   Caetano, M., Madureira, M.J. and Vale, C. (2003) Metal Remobilisation during Resuspension of Anoxic Contaminated Sediment: Short-Term Laboratory Study. Water Air Soil Pollution, 143, 23-40.
https://doi.org/10.1023/A:1022877120813

[4]   Vale, C., Ferreira, A., Micaelo, C., Caetano, M., Pereira, E., Madureira, M.J. and Ramalhosa, E. (1998) Mobility of Contaminants in Relation to Dredging Operations in a Mesotidal Estuary (Tagus Estuary, Portugal). Water Science Technology, 37, 25-31.

[5]   Monteiro, M.T., Oliveira, R. and Vale, C. (1995) Metal Stress on the Plankton Communities of Sado River (Portugal). Water Research, 29, 695-701.
https://doi.org/10.1016/0043-1354(94)00156-2

[6]   Cabrita, M.T., Raimundo, J., Pereira, P. and Vale, C. (2013) Optimizing Alginate Beads for the Immobilisation of Phaeodactylum tricornutum in Estuarine Waters. Marine Environmental Research, 87-88, 37-43.
https://doi.org/10.1016/j.marenvres.2013.03.002

[7]   Pan, K. and Wang, W.-X. (2012) Trace Metal Contamination in Estuarine and Coastal Environments in China. Science Total Environment, 421-422, 3-16.
https://doi.org/10.1016/j.scitotenv.2011.03.013

[8]   Rogers, S.I. and Greenaway, B. (2005) A UK Perspective on the Development of Marine Ecosystem Indicators. Marine Pollution Bulletin, 50, 9-19.
https://doi.org/10.1016/j.marpolbul.2004.10.028

[9]   Paerl, H.W., Lexia, M.V., Alan, R.J. and Valerie, W. (2007) Phytoplankton Indicators of Ecological Change in the Eutrophying Pamlico Sound System, North Carolina. Ecological Applications, 17, 88-101.
https://doi.org/10.1890/05-0840.1

[10]   Ade Sobande and Associates (1998) Dredging Impact Study. Report, Shell Petroleum Development Company of Nigeria (SPDC), Warri.

[11]   Ohimain, E.I., Imoobe, T.O.T. and Benka-Coker, M.O. (2002a) Impacts of Dredging on Zooplankton Communities of Warri River, Niger Delta. African Journal of Environmental Pollution and Health, 1, 37-45.

[12]   Ohimain, E.I., Benka-Coker, M.O. and Imoobe, T.O.T. (2002b) Algal Bloom in a Newly Dredged Canal in a Tropical Mangrove Ecosystem. In Press.

[13]   Ohimain, E.I., Benka-Coker, M.O. and Imoobe, T.O.T. (2002c). Impacts of Dredging on the Abundance and Diversity of Benthic Invertebrates in the Niger Delta. UNIBEN Digest. In Press.

[14]   US Geological Survey (2004) Chesapeake Bay River Input Monitoring Program.
http://va.water.usgs.gov/chesbay/RIMP/waterchem.html

[15]   Moss, B., Madgwick, J. and Phillips, G. (1996) A Guide to the Restoration of Nutrient Enriched Shallow Lakes. W W Hawes, UK.

[16]   Jain, C.K. and Ram, D. (1997) Adsorption of Metal Ions on Bed Sediments. Hydrological Science Journal, 42, 713-723.
https://doi.org/10.1080/02626669709492068

[17]   Nielsen, P. (2009) Coastal and Estuarine Processes. World Scientific, Singapore.
https://doi.org/10.1142/7114

[18]   Manap, N. and Voulvoulis, N. (2015) Environmental Management for Dredging Sediments—The Requirement of Developing Nations. Journal of Environmental Management, 147, 338-348.

[19]   Ohimain, E.I. (2004) Environmental Impacts of Dredging in the Niger Delta. Terra et Aqua, 97, 9-19.

[20]   Sammut, J. and Lines-Kelly, R. (1996) An Introduction to Acid Sulfate Soils.

[21]   Ohimain, E.I. (2003a) Environmental Impacts of oil Mining Activities in the Niger Delta Mangrove Ecosystem. Proceedings of the International Mine Water Association Congress, Johannesburg, October 2003, 503-517.

[22]   Ohimain, E.I. (2003c) Available Options for the Bioremediation and Restoration of Abandoned Pyritic Dredge Spoils Causing the Death of Fringing Mangroves in the Niger Delta. The International Biohydrometallurgy Symposium, Athens, September 2003, 475-481.

[23]   Ohimain, E.I. (2001) Bioremediation of Heavy Metal Contaminated Dredged Spoil from a Mangrove Ecosystem in the Niger Delta. PhD Thesis, School of Postgraduate Studies, University of Benin, Benin City, 341 p.

[24]   Burford, M.A. and O’Donohue, M.J. (2006) A Comparison of Phytoplankton Community Assemblages in Artificially and Naturally Mixed Subtropical Water Reservoirs. Freshwater Biology, 51, 973-982.
https://doi.org/10.1111/j.1365-2427.2006.01536.x

[25]   Lucas, C.H., Widdows, J., Brinsley, M.D., Salkeld, P.N. and Herman, P.M.J. (2000) Benthic-Pelagic Exchange of Microalgae at a Tidal Flat. 1. Pigment Analysis. Marine Ecology Progress Series, 196, 59-73.
https://doi.org/10.3354/meps196059

[26]   APHA-AWWA-WPCF (2005) Standard Methods for the Examination of Water and Wastewater. 15th Edition, R.R. Donnelley & Sons Company, Chicago, 547.

[27]   FAO/SIDA (1983) Manual of Methods in Aquatic Environmental Research, Part 9. Analyses of Metals and Organochlorines in Fish. FAO Fisheries Technical Paper, 212.

[28]   Martins, M.V.A., Laut, L., Duleba, W., Zaaboub, N., Aleya, L., Terroso, D.L., Sequeira, C., Pena, A., Rodrigues, M.A. and Rocha, F. (2017) Sediment Quality and Possible Uses of Dredged Materials: The Ria de Aveiro Lagoon Mouth Area (Portugal). Journal of Sedimentary Environments, 2, 149-166.

[29]   Mostafa, Y.E.S. (2012) Environmental Impacts of Dredging and Land Reclamation at Abu Qir Bay, Egypt. Ain Shams Engineering Journal, 3, 1-15.
https://doi.org/10.1016/j.asej.2011.12.004

[30]   Reavell, P.E. (1997) The Effect of Dredging on Light Penetration in the Boro River, Okavango Delta, Botswana, from 1972 to 1975. Water SA, 23, 109.

[31]   Akintola, S.L., Jimoh, A.A., Owodehinde, F.G., Whenu, O.O. and Fakoya, K.A. (2009) Environmental Threat to the Development of Aquaculture in Lagos State, Nigeria. European Journal of Scientific Research, 34, 337-347.

 
 
Top