Assessment of the trophic state of Awba Reservoir Ibadan, Southwest Nigeria
March 5, 2021
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| Article Title: | Assessment of the trophic state of Awba Reservoir Ibadan, Southwest Nigeria |
| Authors: | Ayoade A. A., Aderogba A. |
| Affiliation: | 1Hydrobiology and Fisheries Unit, Department of Zoology, University of Ibadan, Ibadan, Oyo State, Nigeria 2Ecology and Environmental Biology Unit, Department of Zoology, University of Ibadan, Ibadan, Oyo State, Nigeria |
| Abstract: | This study was carried out to determine the trophic status of a tropical man-made lake that supplies water to the University of Ibadan community. Water samples were collected for six months and analyzed for physico-chemical parameters including total nitrogen, total phosphorus and chlorophyll-a. Phytoplankton samples were collected and analyzed using standard methods. The trophic level was calculated with the Carlson formula. The obtained mean total phosphorous was above the typical lake total phosphorus concentration. The total nitrogen: total phosphorus ratio of the lake was interpreted that nitrogen could be the limiting factor for primary production. The high correlation between chlorophyll-a and Secchi depth suggest that chlorophyll-a was the major light attenuating substance in Awba reservoir. Trophic state index values from total phosphorus, chlorophyll a and Secchi disc transparency of Awba reservoir exceeded the criteria at which lakes are interpreted as eutrophic. The abundant green algae and blue green algae give further evidence that the reservoir may be eutrophic. |
| Keywords: | chlorophyll-a, TN: TP, secchi disc transparency, Awba reservoir |
| *Correspondence: | Hydrobiology and Fisheries Unit, Department of Zoology, University of Ibadan, Ibadan, Oyo State, Nigeria, Tel. +234-8033855807, email- kenpeadobece@gmail.com |
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