Zooplankton assemblages of Oguta lake | [Bioscience Research • 2024]

Author(s):

1. Uzoka Christopher Ndubuisi: Department of Environmental Management, Federal University of Technology,Owerri,Nigeria

2. Ibe Colman Chikwem: Department of Science Laboratory Technology, Imo State Polytechnic,Omuma,Nigeria

3. Uche Cosmas Chinedu: Department of Environmental Management, Federal University of Technology,Owerri,Nigeria

4. Samuel Ikpo Ogbaa: Department of Urban and Regional Planning, Federal University of Technology,Owerri,Nigeria

5. Egwim Chukwumezirim Jideaku: Department of Environmental Management, Federal University of Technology,Owerri,Nigeria

6. Unegbu Nobert Rapuruchukwu: Department of Environmental Management, Federal University of Technology,Owerri,Nigeria

7. Amaku Grace Ebele: Department of Environmental Management, Federal University of Technology,Owerri,Nigeria

8. Ude Anayo Dominic: Department of Urban and Regional Planning, Federal University of Technology,Owerri,Nigeria

9. Acholonu Chidinma Annivena: Department of Environmental Management, Federal University of Technology,Owerri,Nigeria

Abstract:

The abundance and composition of zooplankton in Oguta lake were studied. Oguta lake is strategic as the largest natural lake in the Imo River Basin of South Eastern Nigeria. A plankton net of 2µm mesh size and 30cm diameter was used to obtain the zooplankton and samplings carried out according to stations for a period of one year. Zooplankton samples collected were preserved in 4% formalin before laboratory analysis. With the aid of a compound microscope the zooplankton were identified to species level using relevant taxonomic keys. 38 species of zooplankton belonging to four taxonomic groups; Protozoa, Copepoda, Cladocera and Rotifera were recorded, and in this order: Rotifera > Cladocera > Copepoda >Protozoa. The four sampling stations of Osemoto, Utu, Njaba and Orashi had different relative abundance of 24.3%, 23.79%, 21.66% and 30.17% respectively. Margalef's index of species richness, Simpson's index of species dominance and Jaccard's index of similarity showed less variations among the study stations. The status of Oguta lake could be said to be moderately eutrophic as evidenced by the diversity of zooplankton.

Page(s): 544-552

DOI: DOI not available

Published: Journal: Bioscience Research, Volume: 21, Issue: 3, Year: 2024

Keywords:

abundance , Diversity , Zooplankton , Oguta Lake

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