Benthnic Foraminifera Diversity in the Bonny Estuary, Niger Delta, Nigeria

by C. O. Dublin-Green, Nigerian Inst for Oceanography and, Marine Research, Lagos, Nigeria,

Document Type: Proceeding Paper

Part of: Coastlines of Western Africa


The Bonny estuary is the most exploited in the Niger Delta. Several Oil fields, production platforms and flow stations are located within the estuary. Apart from these industrial uses, the river system provides nursery and breeding grounds for some commercially important species of fish and shrimps. Trends in diversity of benthic foraminifera in the Bonny estuary were investigate with reference to their Species Number (S); Fisher index (α), Shannon-Wiener index (H(S))and Equitability (E) Diversity values were low, with significant seasonal trends. Mean S values were low, with significant seasonal trends. Mean S value for February (late dry season) and September (late rainy season) were 13.0 and 7.0 respectively, while fisher index (α) for the two periods were 2.9 and 0.7. Seasonal values for Shannon-Weiner function (H(S)) were less than 2.0 at all stations sampled, while Equitability (E) ranged from 0.21 to 0.88.

Subject Headings: Developing countries | Estuaries | Seasonal variations | Fish and fishery management | Offshore platforms | Industries | High-rise buildings | Rainfall | Africa | Niger | Nigeria

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