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. 2020 Jun 23;27(26):33373–33379. doi: 10.1007/s11356-020-08763-8

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© The Author(s) 2020

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Fig. 1 — Map of the study area showing the sampling stations (inset a: map of Nigeria showing the locations of Osun and Ogun Rivers; inset b: map of Ogun and Osun River Basins showing their connections with the Gulf of Guinea