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- Title
ASSESSMENT OF THE TROPHIC STATE OF AWBA RESERVOIR, IBADAN, SOUTHWEST NIGERIA.
- Authors
AYOADE, Adedolapo Abeke; ADEROGBA, Aishiat
- 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.
- Subjects
IBADAN (Nigeria); NIGERIA; UNIVERSITY of Ibadan; TROPHIC state index; CHLOROPHYLL in water; DRINKING water quality; GREEN algae; FOOD chains; FACTORS of production; WATER supply
- Publication
Studia Universitatis Vasile Goldis Seria Stiintele Vietii (Life Sciences Series), 2020, Vol 30, Issue 4, p187
- ISSN
1584-2363
- Publication type
Article