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Abundance and Distribution of Benthic Macroinvertebrates and Plankton in the Okulu Aleto River, Eleme, Rivers State, Nigeria

Ogan, Josephine Egbichi; Leo, Chiegbu. Osuji; Onojake, Mudaga Chukuned; Komi, Gentle Wilson

Abstract

Freshwater ecosystems in the Niger Delta region are increasingly threatened by industrial pollution, which can disrupt aquatic biodiversity and ecosystem functions. This study aimed to assess the abundance and distribution of benthic macroinvertebrates and plankton in the Okulu Aleto River, Eleme, Rivers State, Nigeria, to evaluate the ecological impacts of varying pollution levels. Using an experimental research design, samples were collected from six strategically selected locations including: upstream, midstream, downstream, effluent discharge site, and two control sites, representing a gradient of anthropogenic influence. Stratified random sampling was employed to ensure representative spatial coverage. Key results showed a complete absence of plankton and benthic macroinvertebrates in the effluent- impacted site, while control sites recorded the highest taxa richness (up to six taxa) and organism counts (up to 18 individuals). Diversity indices, including Shannon’s index and Simpson’s diversity, were highest at control and composite stations (Shannon’s H up to 1.61, Simpson’s 1-D up to 0.82) and lowest downstream and at effluent sites, indicating reduced ecological health in polluted areas. Elevated physicochemical parameters such as electrical conductivity (up to 17,070 µS/cm) and biochemical oxygen demand correlated with diminished biodiversity. The findings conclude that industrial effluents significantly degrade aquatic biodiversity and water quality, emphasizing the need for continuous monitoring and pollution control to protect riverine ecosystems in the Niger Delta.

Keywords

Benthic MacroinvertebratesPlankton DiversityIndustrial PollutionWater QualityEcological Assessment.

References

Akinwumiju, A. S., Adelodun, A. A., & Ogundeji, S. E. (2020). Geospatial assessment of oil spill pollution in the Niger Delta of Nigeria: an evidence-based evaluation of causes and potential remedies. Environmental Pollution, 267, 115545. Alagoa, K. J., Kariye, E. L., & Charles, E. E. (2023). Post Flood Impact on the Diversity, Abundance and Distribution of Phytoplankton in River-Nun, at Amassoma, Niger Delta, Nigeria. Multidisciplinary Research Journal, 3(2). https://www.multiresearchjournal.com Anetor, G. O., Nwobi, N. L., Igharo, G. O., Sonuga, O. O., & Anetor, J. I. (2022). Environmental pollutants and oxidative stress in terrestrial and aquatic organisms: examination of the total picture and implications for human health. Frontiers in physiology, 13, 931386. Ben, I. (2022). The development of a framework for assessing the impact of oil spills in the Ogoni land of Nigeria Niger Delta (Doctoral dissertation, Glasgow Caledonian University). Chindah, A. C., & Nduaguibe, T. O. (2022). Impact of Refinery Effluents on Phytoplankton Communities in the Niger Delta: A Case Study of the Okrika Estuarine System. Nigerian Journal of Aquatic Sciences, 37(2), 104–113. Corami, F., Rosso, B., Sfriso, A. A., Gambaro, A., Mistri, M., Munari, C., & Barbante, C. (2022). Additives, plasticizers, small microplastics (< 100 ?m), and other microlitter components in the gastrointestinal tract of commercial teleost fish: Method of extraction, purification, quantification, and characterization using Micro-FTIR. Marine Pollution Bulletin, 177, 113477. Edegbene, A. O., Emenike, E. O., & Ogidiaka, E. (2020). Water Quality and Phytoplankton Composition of the Ethiope River in Southern Nigeria. Environmental Monitoring and Assessment, 192(5), 1–12. Edegbene, A. O., Omoigberale, M. O., & Oribhabor, B. J. (2020). Sediment pollution and its ecological implications in Niger Delta aquatic ecosystems. Nigerian Journal of Applied Biology and Environmental Sciences, 18(3), 120–130. El Hayany, B., Rumpel, C., Hafidi, M., & El Fels, L. (2022). Occurrence, analysis of microplastics in sewage sludge and their fate during composting: A literature review. Journal of Environmental Management, 317, 115364. G?rtner, G., Stoyneva-G?rtner, M., & Uzunov, B. (2021). Algal toxic compounds and their aeroterrestrial, airborne and other extremophilic producers with attention to soil and plant contamination: A review. Toxins, 13(5), 322. Ibigoni, B. M., Eremie, J. A., & Wokoma, S. (2024). Ecotoxicological risks of petrochemical effluents on water and sediment quality in the Okulu Aleto River, Rivers State. African Journal of Environmental Pollution and Health, 9(1), 88–101. Igbani, F., Tatah, G. W., & Odekina, M. U. (2024). A Review on the Effects of Crude Oil Spill on Aquatic Life (Fish) in The Niger Delta, Nigeria. International Journal of Environment and Pollution Research, 12(1), 75-94. Kabir, A. E., Sekine, M., Imai, T., Yamamoto, K., Kanno, A., & Higuchi, T. (2021). Assessing small-scale freshwater microplastics pollution, land-use, source-to-sink conduits, and pollution risks: Perspectives from Japanese rivers polluted with microplastics. Science of the Total Environment, 768, 144655. Kalaronis, D., Ainali, N. M., Evgenidou, E., Kyzas, G. Z., Yang, X., Bikiaris, D. N., & Lambropoulou, D. A. (2022). Microscopic techniques as means for the determination of microplastics and nanoplastics in the aquatic environment: A concise review. Green Analytical Chemistry, 3, 100036. Ndimele, P. E., Kumolu-Johnson, C. A., & Anetekhai, M. A. (2021). Phytoplankton Composition and Water Quality of a Riverine Ecosystem in the Niger Delta. Niger Delta Biologia, 21(1), 23–33. Nduka, J. C., Nkpaa, K. W., & Daka, E. R. (2023). Assessment of Plankton Diversity and Water Quality in Bonny River, Niger Delta, Nigeria. African Journal of Aquatic Science, 48(1), 87–99. Ngodigha, S. A., Ngeri, B. N., & Uwakwe, C. (2025). Sediment quality assessment of rivers impacted by petrochemical industries in the Niger Delta. Journal of Environmental Monitoring and Restoration, 3(1), 18–29. Ngodigha, S. A., Uyi, H. S., & Deekae, S. N. (2025). Diversity and Abundance of Benthic Macro Invertebrate at Middle Reaches of Orashi River, Niger Delta. International Journal of Global Sustainable Research, 2(8), 531–544. Nuhu, M. M., Rene, E. R., & Ishaq, A. (2022). Remediation of crude oil spill sites in Nigeria: problems, technologies, and future prospects. Environmental Quality Management, 31(4), 165-175. Olarinmoye, O. M., Stock, F., Scherf, N., Whenu, O., Asenime, C., & Ganzallo, S. (2020). Microplastic presence in sediment and water of a lagoon bordering the urban agglomeration of Lagos, Southwest Nigeria. Geosciences, 10(12), 494. Olubusoye, B. S., Oni, P., Owusu, F., Adekoya, O., Ongwech, A., Odogwu, D. A., ... & Arwenyo, B. (2023). Microplastics in Marine Environment: Occurrence, Distribution, and Extraction Methods in Marine Organisms. Open Journal of Ecology, 13(12), 931- Pironti, C., Ricciardi, M., Motta, O., Miele, Y., Proto, A., & Montano, L. (2021). Microplastics in the environment: intake through the food web, human exposure and toxicological effects. Toxics, 9(9), 224. Shruti, V. C., Pérez-Guevara, F., Kutralam-Muniasamy, G. (2021). Use of Scanning Electron Microscopy (SEM) in Microplastics Research. In: Microplastics in the Ecosphere. Springer, Cham. https://doi.org/10.1007/978-3-030-78627-3_12 Smith, J. K., Green, L. E., & Patel, S. S. (2021). Herbicide impacts on amphibian populations: A meta-analysis of ecological studies. Ecological Applications, 31(3), e02204. Woke, G. N., Ogamba, E. N., & Amakiri, M. A. (2020). Effects of industrial waste on the physicochemical properties of surface waters in the Niger Delta region. African Journal of Environmental Science and Technology, 14(7), 213–221. Woke, G. N., Omofonmwan, S. I., & Ogbanga, M. N. (2020). Assessment of Water Quality and Phytoplankton Diversity of the Elelenwo River, Rivers State, Nigeria. Journal of Applied Sciences and Environmental Management, 24(1), 123–129.

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