Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria

  • Oluseun Peter BOLAWA Obafemi Awolowo University, Department of Zoology, Ile-Ife (NG)
  • Adebukola Adenike ADEDEJI Obafemi Awolowo University, Department of Zoology, Ile-Ife (NG)
  • Yetunde Folasade TAIWO Obafemi Awolowo University, Natural History Museum, Ile-Ife (NG)
Keywords: Opa reservoir occurrence; spatial variation; species richness; temporal variation zones; trophic state index


The present study investigated the ecological status of Opa reservoir, Obafemi Awolowo University, Ile Ife, Nigeria, based on the spatial and temporal variations in abundance and distribution of zooplankton. 72 samples were collected monthly with a quantitative net zooplankton from both the surface and bottom levels in three stations established at the dam site (Lacustrine), mid-lake (Transition) and inflow (Riverine) over a period of an annual cycle. A total of fifty-four (54) species were recorded from the reservoir comprising Rotifera (57.41%) > Arthropoda (33.33%) > Protozoa (5.56%) > Ciliophora (1.85%) = Cnidaria (1.85%), in the order of abundance. The least number of species (47) was recorded at the Transition station, while the highest number of species (49) occurred at the Lacustrine zone. Of all the zooplankton recorded, four species had significant spatial variation, while nine displayed seasonal variations during the study period (p ≤ 0.05). The highest species richness was observed in Transition surface station (4.18), followed by Lacustrine surface station (3.80) and Riverine surface station (3.23). Shannon’s index showed that zooplankton species were more diverse during the rainy season than dry season. The highest Trophic State Index (TSICR) with respect to Rotifer abundance occurred in Transition surface, followed by Riverine surface and the least occurred in Transition bottom portion. The mean TSICR value obtained was 65.20, indicative of hyper-eutrophic, while the mean TSICL value with respect to cyclopoida-calanoida obtained was 58.07 also revealing eutrophic status of the study area. Opa reservoir comprises mainly Rotifers and its TSICR showed the lake as eutrophic, tending towards becoming hyper-eutrophic, which could speed up the aging of the lake.


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Author Biography

Oluseun Peter BOLAWA, Obafemi Awolowo University, Department of Zoology, Ile-Ife


Abioye HY (2015). Planktonic community and primary productivity of Owalla Reservoir, Osun state, Nigeria. M.Sc. Thesis. Department of Zoology, Obafemi Awolowo University, Ile-Ife, Osun state, Nigeria.

Adedeji AA, Aduwo AI, Aluko OA, Awotokun F (2011). Effect of chicken droppings as organic fertilizer on water quality and planktonic production in an artificial culture media. Ife Journal of Science 13(2):239-249.

Adesakin, TA, Adedeji AA, Aduwo AI, Taiwo YF (2017). Effect of discharges from re-channeled rivers and municipal runoff on water quality of Opa reservoir, Ile-Ife, Southwest Nigeria. African Journal of Environmental Science and Technology 11(1):56-70.

Akinbuwa O (1992). A preliminary study of diurnal vertical distribution of Rotifers in Opa Reservoir, Nigeria. Journal of Aquatic Science 7:19-28.

Akinbuwa O, Adeniyi IF (1991). The Rotifera fauna of Opa reservoir, Ile-Ife, Nigeria. Journal of African Zoology 105(5):383-391.

Akinbuwa O and Adeniyi IF (1996). Seasonal variation, distribution and interrelationships of Rotifers in Opa Reservoir, Nigeria. African Journal of Ecology 34:351-363.

Akindele EO, Adeniyi IF (2013). A study of the physicochemical water quality, hydrology and zooplankton fauna of Opa Reservoir. African Journal of Environmental Science and Technology 7(5):192-203.

Arimoro FO, Oganah AO (2010). Zooplankton community responses in a perturbed tropical stream in the Niger Delta, Nigeria. The Open Environmental and Biological Monitoring Journal 3(1):1-11.

Ayodele HA, Adeniyi IF (2006). The zooplankton fauna of six impoundments on the river Osun, Southern Nigeria. The Zoologist 1(4):49-67.

Burger DF, Hogg ID, Green JD (2002). Distribution and abundance of zooplankton in the Waikato River, New Zealand. Hydrobiologia 479(1):31-38.

Burns NM, Rutherford JC (1998). Results of monitoring New Zealand lakes, 1992-1996. NIWA Hamilton Client Report MFE80216, Hamilton, New Zealand. In: https: //doi.org /10.1080 /07438149909354122 .

Carpenter SR, Kitchell JF (1993). The trophic cascade in lakes. Cambridge University Press, Cambridge, pp 301-335.

Casanova SMC, Henry R (2004). Longitudinal distribution of Copepoda populations in the transition zone of Paranapanema river and Jurumirin reservoir (Sao Paulo, Brazil) and interchange with two lateral lakes. Brazilian Journal of Biology 64(1):11-26.

Clark EO, Aderinola OJ and Adeboyejo OA (2013). Dynamics of Rotifer Populations in a Lagoon Bordered by Heavy Industry in Lagos, Nigeria. American Journal of Research Communication 1(4):172-192.

Coulter GW (1991). Pelagic fish. In: Coulter GW (Ed). Lake Tangayika and its life. Oxford University Press, London pp 111-138.

Duggan IC, Duggan KS (2011). Are botanical gardens a risk for zooplankton invasions? Biological Invasions 13:2997-3003.

Duggan IC, Green JD, Shiel RJ (2001). Distribution of Rotifers in North Island, New Zealand, and their potential use as bioindicators of Lake Trophic State. Hydrobiologia 446-447:155-157.

Egborge ABM (1994). Water pollution in Nigeria: Biodiversity and chemistry of Warri River, Nigeria. Ben Miller Publisher, Warri, Nigeria pp 254.

Ejsmont-Karabin J (2012). The usefulness of zooplankton as lake ecosystem indicators: Rotifer trophic index. Polish Journal of Ecology 60:339-350.

Ejsmont-Karabin J, Karabin A (2013). The suitability of zooplankton as lake ecosystem indicator; Crustacean trophic state index. Polish Journal of Ecology 61(3): 561-573.

Ekpo I (2013). Effect of physico-chemical parameters on zooplankton species and density of a tropical rainforest river in Niger Delta, Nigeria using canonical cluster analysis. The International Journal of Engineering and Science 2(4):13-21.

Fawole OO, Arawomo GAO (2000). Fecundity of Sarotherodon galilaeus (Pisces: Cichlidae) in the Opa reservoir, Ile-Ife, Nigeria. Revista de Biología Tropical 48(1):201-204.

Fernando CH (2002). A guide to tropical freshwater zooplankton: identification, ecology and impact on fisheries. Backhuys publishers, Leiden, The Netherlands pp 291.

Fernando CH, Paggi JC, Rajapaksa R (1987). Daphnia in tropical lowlands. Member of Institute of Hydrobiology 45:107-141.

Goswami SC (2004). Zooplankton methodology, collection and identification - a Field Manual. National Institute of Oceanography. Dhargalkar, V.K. Verlecar, X.N. (Eds). Dona Paula, Goa pp 205-300.

Haberman J, Haldna M (2014). Indices of zooplankton community as valuable tools in assessing the trophic state and water quality of eutrophic lakes: long term study of Lake Vortsjarv. Journal of Limnology 73(2):263-273.

Ibrahim S (2009). A survey of zooplankton diversity of Challawa River, Kano and evaluation of some of its physicochemical conditions. Bayero Journal of Applied Sciences 2(1):19-26.

Imoobe TOT (2011). Diversity and seasonal variation of zooplankton in Okhuo River, a tropical forest river in Edo State, Nigeria. Centrepoint Journal 17(1):37-51.

Jeje CY, Fernando CH (1986). A practical guide to the identification of Nigerian zooplankton (Cladocera, Copepoda and Rotifera). Kanji Lake Research Institute, New Bussa, Nigeria, Publication pp 142.

Mageed AA, Konsowa AH (2002). Relationship between phytoplankton, zooplankton and fish culture in a freshwater fish farm. Egyptian Journal of Aquatic Biology and Fisheries 16(2):183-206.

Mitsch WJ, Gosselink RL (2000). Wetlands. 3rd Ed., John Wiley, New York, USA pp 920.

Moshood KM (2002). A pre-impoundment survey of the flora and fauna communities of Oyun Lake in Ilorin, Kwara state, Nigeria. Nigerian Journal of Pure and Applied Sciences 17:1200-1209.

Offem BO, Ayotunde EO, Ikpi GU, Ada FB, Ochang SN (2011). Plankton-based assessment of the trophic state of three tropical lakes. Journal of Environmental Protection 2:304-315.

Ogunfowokan AO, Akanni MS, Ajibola RO, Ayinde FO (2011). Trophic status and physicochemical parameters of three reservoirs in Osun State, Nigeria. Ife Journal of Science 13(1):27-44.

Okogwu OI (2010). Seasonal variations of species composition and abundance of zooplankton in Ehoma Lake, a floodplain lake in Nigeria. Revista De Biología Tropical 58(1):171-182.

Olaleye VF, Adedeji, AA (2005). Water and planktonic quality of a palm oil effluent impacted river in Ondo state, Nigeria. International Journal of Zoological Research 1(1):15-20.

Paterson M (2001). Protocols for measuring biodiversity; zooplankton in freshwaters. www. eman-resecaleman /ecotools/ protocols /freshwater /zooplankton.

Sarkar SK , Chaudhary B (1999). Role of some environmental factors on the fluctuations of plankton in a lentic pond at Calcutta, Limnological Research in India, Daya Publishing House pp 108-130.

SPSS (Statistical Package for Social Sciences) (2012). Statistical Package for the Social Sciences Base 21 for Windows. Chicago, IL: SPSS.

Tshevelova NG, Pomazkova I (1995). The Order Cladocera. In: O. Timoshkin (ed.). Guide and Key to Pelagic Animals of Baikal. Nauka, Novosibirisk pp 431-474.

Yao H, Qian X, Gao H, Wang Y, Xia B (2014). Seasonal and Spatial variations in Heavy Metals in Two typical Chinese Rivers: Concentrations, Environmental Risks and Possible sources. International Journal on Environmental Resource and Public Health 11:11860-11878.

How to Cite
BOLAWA, O. P., ADEDEJI, A. A., & TAIWO, Y. F. (2018). Temporal and Spatial Variations in Abundance and Diversity of Zooplankton Fauna of Opa Reservoir, Obafemi Awolowo University, Ile-Ife, Southwest Nigeria. Notulae Scientia Biologicae, 10(2), 265-274. https://doi.org/10.15835/nsb10210170
Research articles
DOI: 10.15835/nsb10210170