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Environmental sensitivity index mapping of Lagos shorelines

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Pages :
277 - 287

Oyedepo J.A. and Adeofun C.O.
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Environmental Sensitivity Index (ESI) mapping of Atlas Cove, Lagos, Nigeria was carried out with
the objective of producing an Environmental Analysis Index map of the shorelines. The study
integrated methodologies developed by National Oceanic and Atmospheric Administration (NOAA)
and Nigerian Oil Producing Trade Sector (OPTS) for the study. The result of the assessment was
validated by comparison with the ESI standads in Nigeria. 9 ESI types were found in the area
namely; ESI types 1b, 2a, 2b 3a, 4a, 6b, 9b, 9c, and 10a. Animal biodiversities such as shorebirds
(Tringaly poleucos and Charadrinning marginatus), sea turtles (Dermocellys spp) and white crabs
(Occipoda africana) were more prominent on the western shores. Spearman’s Correlation coefficient
(r) value of -0.6 was obtained for the association between number of socioeconomic features and
biological species along the shores. This shows that a cause and effect exists between biological
productivity and anthropogenic activities along the shorelines. The study ranked Mangrove swamps,
creeks and fresh water swamp highest with ESI values of 10a. Margalef’s index also shows that the
same areas are the most sensitive with respect to species richness. The database developed from
the study provides baseline information on the biophysical and socio-cultural condition of the
environment and can serve as good decision support system for coastal managers.

ESI, Oil spill, Geographic Information Systems, Atlas cove, Nigeria