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The development of a Biotic Pollution Index for the River Nile in Egypt

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Abstract

This article describes the development of a Nile Biotic Pollution Index (NBPI) for the River Nile in Egypt. Chemical data were collected from 30 locations along the Nile from Aswan to Cairo and 21 sites within the river delta, incorporating a range of conditions from unpolluted to grossly polluted. Seven chemical variables were used to calculate a Nile Chemical Pollution Index (NCPI) for each site. Biological data were collected primarily using Artificial Substrate Samplers (ASS). The UK developed, Biological Monitoring Working Party (BMWP) biotic index and the BMWP-ASPT were applied to the data. A Nile Biotic Pollution Index (NBPI) and the NBPI-ASPT were obtained by incorporating more of the Nile taxa. There were highly significant regressions (P < 0.001) for both the UK and the Nile Pollution Index scores with the NCPI for the whole river. The modification of the UK indices improved the Nile Indices increasing the number of taxa recorded from 29 to 43 and the total number of recorded taxon occurrences from 377 to 490. The Nile Indices provided better discrimination at both ends of the pollution spectrum. The NBPI-ASPT was best for the river as a whole, and particularly for the river from Aswan to Cairo. The NBPI was much better in the delta than from Aswan to Cairo. These differences in performance were attributed to the fact that the NBPI-ASPT excludes information on taxon diversity. In clean waters there was a wide range of NBPI score suggesting that the biodiversity of taxa is dependent on other aspects of habitat quality. Conversely in the polluted delta the high score of an individual taxon is critical for the NBPI-ASPT as it may have a distorting effect. As the NBPI-ASPT was the most consistent biotic index it is recommended as the regular biological assessment and regulatory tool for Egypt to meet the requirements of the Convention for Biodiversity.

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Acknowledgements

We are most grateful to the British Council which funded the work through a British Council link agreement between Kings College London and the National Institute of Oceanography and Fisheries, Inland water and Aquaculture Branch, Cairo.

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Authors and Affiliations

  1. National Institute of Oceanography and Fisheries, Inland Water and Aquaculture Branch, 101 Kasr El Aini St., Cairo, Egypt

    M. Reda Fishar

  2. Department of Geography, Centre for Environmental Assessment, Management and Policy, King’s College University of London, Strand, London, WC2R 2LS, UK

    W. Peter Williams

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  1. M. Reda Fishar
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  2. W. Peter Williams
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Correspondence to M. Reda Fishar.

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Handling editor: R. Norris

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Fishar, M.R., Williams, W.P. The development of a Biotic Pollution Index for the River Nile in Egypt. Hydrobiologia 598, 17–34 (2008). https://doi.org/10.1007/s10750-007-9137-7

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  • DOI: https://doi.org/10.1007/s10750-007-9137-7

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