Physico-chemical parameters, chlorophyll a and phytoplankton community as trophic state indices of two tropical lakes, southwestern Nigeria
  • Article Type: Research Article
  • Eurasian Journal of Biosciences, 2019 - Volume 13 Issue 1, pp. 15-22
  • Published Online: 06 Feb 2019
  • Article Views: 629 | Article Download: 386
  • Open Access Full Text (PDF)
AMA 10th edition
In-text citation: (1), (2), (3), etc.
Reference: Ayoade AA, Osuala BO, Adedapo TA. Physico-chemical parameters, chlorophyll a and phytoplankton community as trophic state indices of two tropical lakes, southwestern Nigeria. Eurasia J Biosci. 2019;13(1), 15-22.

APA 6th edition
In-text citation: (Ayoade et al., 2019)
Reference: Ayoade, A. A., Osuala, B. O., & Adedapo, T. A. (2019). Physico-chemical parameters, chlorophyll a and phytoplankton community as trophic state indices of two tropical lakes, southwestern Nigeria. Eurasian Journal of Biosciences, 13(1), 15-22.

Chicago
In-text citation: (Ayoade et al., 2019)
Reference: Ayoade, Adedolapo Abeke, Blessing O. Osuala, and Temitayo A. Adedapo. "Physico-chemical parameters, chlorophyll a and phytoplankton community as trophic state indices of two tropical lakes, southwestern Nigeria". Eurasian Journal of Biosciences 2019 13 no. 1 (2019): 15-22.

Harvard
In-text citation: (Ayoade et al., 2019)
Reference: Ayoade, A. A., Osuala, B. O., and Adedapo, T. A. (2019). Physico-chemical parameters, chlorophyll a and phytoplankton community as trophic state indices of two tropical lakes, southwestern Nigeria. Eurasian Journal of Biosciences, 13(1), pp. 15-22.

MLA
In-text citation: (Ayoade et al., 2019)
Reference: Ayoade, Adedolapo Abeke et al. "Physico-chemical parameters, chlorophyll a and phytoplankton community as trophic state indices of two tropical lakes, southwestern Nigeria". Eurasian Journal of Biosciences, vol. 13, no. 1, 2019, pp. 15-22.

Vancouver
In-text citation: (1), (2), (3), etc.
Reference: Ayoade AA, Osuala BO, Adedapo TA. Physico-chemical parameters, chlorophyll a and phytoplankton community as trophic state indices of two tropical lakes, southwestern Nigeria. Eurasia J Biosci. 2019;13(1):15-22.

Abstract

Background: Asejire and Eleyele Lakes are sources of water supply and used for fishing activities in southwestern Nigeria. However, various anthropogenic activities occur in their catchment area that could lead to deterioration of the ecological status. The purpose of this research was to determine the trophic status of the lakes (on which there is limited information) based on the environmental variables, chlorophyll a and phytoplankton assemblage.
Methods: Water samples were collected for six months and analyzed for total nitrogen, total phosphorus, chlorophyll a and phytoplankton. Other physicochemical parameters were determined in situ. The trophic level was calculated with the Carlson Formula. Phytoplankton data were analyzed to determine diversity indices using the Shannon Weiner and Margalef formula.
Results: The total nitrogen: total phosphorus ratio of the two lakes was interpreted that nitrogen could be the limiting factor for primary production. Trophic state index values from total phosphorus, chlorophyll a and Secchi disc transparency of both lakes exceeded the criteria at which lakes are interpreted as eutrophic. The dominance of blue green algae and abundance of green algae in both lakes further suggested they are eutrophic. The Shannon-Weiner and Margalef diversity indices for Eleyele and Asejire Lakes were H= 0.78, d = 8.78 and H= 0.72, d= 8.02, respectively.
Conclusion: These values suggested the lakes are in eutrophic condition. Future management activities need to reduce phosphorus load of the two lakes.

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