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Temporal Turnover Outweighs Spatial Differences in The Fish Assemblage of a Peri-Urban Tidal River During the Early Rainy Season: The Egbelu Reach of The New Calabar River, Niger Delta, Nigeria

Wala Chimela, Onisowurun Tom Lazarus, and Eke-John Honour Chibueze

Abstract

Tidal rivers that pass through growing Niger Delta towns sustain artisanal fisheries, but surveys rarely collect fish and water quality data at the same places and times. We sampled three stations on the Egbelu reach of the New Calabar River, Rivers State, Nigeria, each month from May to July 2026. On every visit we measured eleven physico-chemical variables and caught fish with gill nets, cast nets and hooks. Salinity, conductivity and total dissolved solids differed among stations (p < 0.001), while only temperature and pH changed from month to month. Dissolved oxygen (6.50–6.80 mg L−1) and BOD5 (2.50–2.80 mg L−1) pointed to well- oxygenated water with modest organic loading. We caught 1,533 fish belonging to 20 species and 11 families. Cichlidae made up 28.6% of individuals, Clupeidae 16.0% and Alestidae 11.4%, and Sarotherodon melanotheron was the most abundant species (12.5%). Every species turned up at every station, diversity was almost the same everywhere (H′ = 2.91–2.93; J′ = 0.97–0.98), and Bray–Curtis similarity was above 92%. Sampling month, on the other hand, explained 81% of the variation in assemblage composition (PERMANOVA, pseudo-F = 11.04, p = 0.028), against only 4% for station (p = 0.861). Mugil cephalus, Neochelon falcipinnis, Elops lacerta and other marine-associated species declined from May to July, as Brycinus spp., Hemichromis fasciatus and Chrysichthys nigrodigitatus became more common. In the early rainy season, then, the assemblage changed far more over time than across space, and monitoring of the reach should follow the seasonal cycle rather than add stations.

Keywords

ichthyofauna; estuarine fish assemblage; temporal turnover; PERMANOVA; water quality; Niger Delta

References

Anderson, M. J. (2001). A new method for non-parametric multivariate analysis of variance. Austral Ecology, 26(1), 32–46. https://doi.org/10.1111/j.1442-9993.2001.01070.pp.x APHA. (2017). Standard methods for the examination of water and wastewater (23rd ed.). American Public Health Association, American Water Works Association and Water Environment Federation. Bagenal, T. B. (Ed.). (1978). Methods for assessment of fish production in fresh waters (3rd ed., IBP Handbook No. 3). Blackwell Scientific Publications. Birk, S., Chapman, D., Carvalho, L., Spears, B. M., Andersen, H. E., Argillier, C., Auer, S., Baattrup-Pedersen, A., Banin, L., Beklioğlu, M., Bondar-Kunze, E., Borja, A., Branco, P., Bucak, T., Buijse, A. D., Cardoso, A. C., Couture, R.-M., Cremona, F., de Zwart, D., ... Hering, D. (2020). Impacts of multiple stressors on freshwater biota across spatial scales and ecosystems. Nature Ecology & Evolution, 4(8), 1060–1068. https://doi.org/10.1038/s41559-020-1216-4 Bray, J. R., & Curtis, J. T. (1957). An ordination of the upland forest communities of southern Wisconsin. Ecological Monographs, 27(4), 325–349. https://doi.org/10.2307/1942268 Davies, I. C., & Ekperusi, A. O. (2021). Evaluation of heavy metal concentrations in water, sediment and fishes of New Calabar River in southern Nigeria. Journal of Limnology and Freshwater Fisheries Research, 7(3), 207–218. Dienye, H. E., Olopade, O. A., & Toby, S. A. (2018). Species composition and diversity of cast net fisheries in New Calabar River, Niger Delta, Nigeria. Journal of Biodiversity Conservation and Bioresource Management, 4(1), 19–26. https://doi.org/10.3329/jbcbm.v4i1.37873 Dienye, H. E., & Woke, G. N. (2015). Physico-chemical parameters of the upper and lower reach of the New Calabar River, Niger Delta. Journal of Fisheries & Livestock Production, 3, 154. Dudgeon, D. (2019). Multiple threats imperil freshwater biodiversity in the Anthropocene. Current Biology, 29(19), R960–R967. https://doi.org/10.1016/j.cub.2019.08.002 Elliott, M., & Quintino, V. (2007). The estuarine quality paradox, environmental homeostasis and the difficulty of detecting anthropogenic stress in naturally stressed areas. Marine Pollution Bulletin, 54(6), 640–645. https://doi.org/10.1016/j.marpolbul.2007.02.003 Elliott, M., Whitfield, A. K., Potter, I. C., Blaber, S. J. M., Cyrus, D. P., Nordlie, F. G., & Harrison, T. D. (2007). The guild approach to categorizing estuarine fish assemblages: a global review. Fish and Fisheries, 8(3), 241–268. https://doi.org/10.1111/j.1467- 2979.2007.00253.x Froese, R., & Pauly, D. (Eds.). (2024). FishBase [Database]. World Wide Web electronic publication. https://www.fishbase.org Hammer, Ø., Harper, D. A. T., & Ryan, P. D. (2001). PAST: Paleontological statistics software package for education and data analysis. Palaeontologia Electronica, 4(1), 1–9. Ibim, A. T., Gogo, O. O., Okpofabri, O., & Igbani, F. (2016). The ichthyofaunal assemblage of the lower and upper reaches of New Calabar River, Rivers State, Niger Delta, Nigeria. Journal of Environment and Earth Science, 6(9), 186–197. Idodo-Umeh, G. (2003). Freshwater fishes of Nigeria: Taxonomy, ecological notes, diet and utilization. Idodo Umeh Publishers. Imachrist, I. D., Sikoki, F. D., Kika, P., & Chris, D. I. (2024). Biological significances of environmental pollution in the New Calabar River, southern Nigeria: a case study in zooplankton composition. Journal of Bioresource Management, 11(1), 7. https://doi.org/10.35691/JBM.4202.0016 Junk, W. J., Bayley, P. B., & Sparks, R. E. (1989). The flood pulse concept in river–floodplain systems. Canadian Special Publication of Fisheries and Aquatic Sciences, 106, 110– 127. Koehnken, L., Rintoul, M. S., Goichot, M., Tickner, D., Loftus, A.-C., & Acreman, M. C. (2020). Impacts of riverine sand mining on freshwater ecosystems: a review of the scientific evidence and guidance for future research. River Research and Applications, 36(3), 362–370. https://doi.org/10.1002/rra.3586 Magurran, A. E. (2004). Measuring biological diversity. Blackwell Publishing. Margalef, R. (1958). Information theory in ecology. General Systems, 3, 36–71. Murphy, J., & Riley, J. P. (1962). A modified single solution method for the determination of phosphate in natural waters. Analytica Chimica Acta, 27, 31–36. https://doi.org/10.1016/S0003-2670(00)88444-5 Nwibani, B. H., Olagbemiro, T. O., Bob-Manuel, K. N. O., & Uyi, H. (2025). Assessment of physicochemical characteristics and subtidal benthic macroinvertebrate communities in Luubara Creek and New Calabar River, situated in the Niger Delta region of Nigeria. Journal of Applied Sciences and Environmental Management, 29(5), 1512–1521. https://doi.org/10.4314/jasem.v29i5.16 Olaosebikan, B. D., & Raji, A. (2013). Field guide to Nigerian freshwater fishes (3rd ed.). Federal College of Freshwater Fisheries Technology. Olopade, O. A., & Dienye, H. E. (2018). Distribution and abundance of cichlids in the New Calabar River, Nigeria. Journal of Fisheries, 6(2), 617–622. https://doi.org/10.17017/jfish.v6i2.2018.318 Olopade, O. A., Dienye, H. E., & Oderhohwo, O. (2019). Fish species composition and size structure exploited by gill net fishery in the New Calabar River, Nigeria. Acta Aquatica: Aquatic Sciences Journal, 6(1), 1–6. Olopade, O. A., Sinclair, N. G., & Dienye, H. E. (2017). Fish catch composition of selected small scale fishing gears used in the Bonny River, Rivers State, Nigeria. Journal of Fisheries, 5(1), 455–460. Paugy, D., Lévêque, C., & Teugels, G. G. (Eds.). (2003). The fresh and brackish water fishes of West Africa (Vols. 1–2). IRD Éditions, MNHN and MRAC. Pielou, E. C. (1966). The measurement of diversity in different types of biological collections. Journal of Theoretical Biology, 13, 131–144. https://doi.org/10.1016/0022- 5193(66)90013-0 Potter, I. C., Tweedley, J. R., Elliott, M., & Whitfield, A. K. (2015). The ways in which fish use estuaries: a refinement and expansion of the guild approach. Fish and Fisheries, 16(2), 230–239. https://doi.org/10.1111/faf.12050 R Core Team. (2023). R: A language and environment for statistical computing. R Foundation for Statistical Computing. https://www.R-project.org/ Reid, A. J., Carlson, A. K., Creed, I. F., Eliason, E. J., Gell, P. A., Johnson, P. T. J., Kidd, K. A., MacCormack, T. J., Olden, J. D., Ormerod, S. J., Smol, J. P., Taylor, W. W., Tockner, K., Vermaire, J. C., Dudgeon, D., & Cooke, S. J. (2019). Emerging threats and persistent conservation challenges for freshwater biodiversity. Biological Reviews, 94(3), 849–873. https://doi.org/10.1111/brv.12480 Schneider, W. (1990). FAO species identification sheets for fishery purposes: Field guide to the commercial marine resources of the Gulf of Guinea. FAO Regional Office for Africa. Shannon, C. E., & Weaver, W. (1949). The mathematical theory of communication. University of Illinois Press. Simpson, E. H. (1949). Measurement of diversity. Nature, 163, 688. https://doi.org/10.1038/163688a0 Telesh, I. V., & Khlebovich, V. V. (2010). Principal processes within the estuarine salinity gradient: a review. Marine Pollution Bulletin, 61(4–6), 149–155. https://doi.org/10.1016/j.marpolbul.2010.02.008 Tickner, D., Opperman, J. J., Abell, R., Acreman, M., Arthington, A. H., Bunn, S. E., Cooke, S. J., Dalton, J., Darwall, W., Edwards, G., Harrison, I., Hughes, K., Jones, T., Leclère, D., Lynch, A. J., Leonard, P., McClain, M. E., Muruven, D., Olden, J. D., ... Young, L. (2020). Bending the curve of global freshwater biodiversity loss: An emergency recovery plan. BioScience, 70(4), 330–342. https://doi.org/10.1093/biosci/biaa002 Tukey, J. W. (1949). Comparing individual means in the analysis of variance. Biometrics, 5(2), 99–114. https://doi.org/10.2307/3001913 Virtanen, P., Gommers, R., Oliphant, T. E., Haberland, M., Reddy, T., Cournapeau, D., Burovski, E., Peterson, P., Weckesser, W., Bright, J., van der Walt, S. J., Brett, M., Wilson, J., Millman, K. J., Mayorov, N., Nelson, A. R. J., Jones, E., Kern, R., Larson, E., ... van Mulbregt, P. (2020). SciPy 1.0: Fundamental algorithms for scientific computing in Python. Nature Methods, 17(3), 261–272. https://doi.org/10.1038/s41592-019-0686-2 Whittaker, R. H. (1965). Dominance and diversity in land plant communities. Science, 147(3655), 250–260. https://doi.org/10.1126/science.147.3655.250

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