Advertisement

Hydrobiologia

, Volume 30, Issue 1, pp 154–176 | Cite as

Hydrology and Plankton of Eleiyele Reservoir Ibadan, Nigeria

  • A. M. A. Imevbore
Article

Summary

This study describes seasonal variation in the numbers of planktonic organisms in relation to hydrological changes in a flood-controlled reservoir at Ibadan, Nigeria. Results of fortnightly estimations of water-level, temperature, transparency, and oxygen content have been presented. The reservoir is thermally stratified for most of the year but the periodic flooding following heavy rainfall and the occasional breakdown of the periodic flooding following heavy rainfall and the occasional breakdown of the thermal stratification by winds during the dry season dominate the habitat, causing regular seasonal fluctuation in plant nutrients and the transparency of the water.

Such effects have also been shown to exert an important influence directly on the zooplankton as well as on the phytoplankton. The highest plankton densities were recorded during periods of maximum water level and the lowest during the beginning of the filling process. Some evidence suggests that the zooplankton feeds directly on bacteria-rich detritus and that the phytoplankton probably plays an insignificant part as food source for the zooplankton. The phytoplankton may be controlled primarily by the limitation and decline of plant nutrients from the reservoir bed.

Keywords

Phytoplankton Bottom Sediment Nigeria Flood Water Algal Density 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Résumé

Etude concernant les variations de la quantité de plancton en rapport avec les changements de l'eau dans un reservoir a Ibadan (Nigéria). Les résultats des mensurations bimensuelles du niveau de l'eau, de sa température et de sa transparence ont été étudiés. L'auteur a fait une stratification thermale pour une grande partie de l'année, mais l'inondation périodique qui suit chaque grande précipitation ainsi que la perturbation occasionelle de la stratification thermale efectuée par les vents pendant la saison sèche, dominent le milieu et occasionnent des variations régulières dans la quantité des plantes nutritives et dans la transparence de l'eau.

Ces phénomènes ont une grande influence directe sur le zooplancton aussi bien que sur le phytoplancton. Les densités les plus considérables de plancton sont enrégistrées pendant la saison où le niveau de l'eau est au maximum et les plus basses au début de la saison d'inondation. Les résultats montrent que le zooplancton se nourrit du détritus très riche en bactéries et que le phytoplancton ne joue qu'un rôle insignifiant comme source de nourriture pour le zooplancton. On peut d'ordinaire contrôler le phytoplancton par la limitation et la diminution des plantes nutritives dan le lit du réservoir.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Beauchamp, R. S. A. - 1952 - Introduction. In:East Afr. Fish. Res. Ann. Rep. Part I.Google Scholar
  2. Beauchamp, R. S. A. - 1953 - Sulphates in African Inland waters. Nature, Lond., 171: 769–771.CrossRefGoogle Scholar
  3. Birge, E. A.- 1907 - The respiration of an inland lake. Trans. Amer. Fish. Soc., 36: 223–241.CrossRefGoogle Scholar
  4. Blanc, M., Daget, J. & D'Aubenton, F. - 1955 - Recherches Hydrobiologiques dans le Bassin du Moyen Niger. Bull. Inst. franç. Afr. noire, (A) 17: 680–746.Google Scholar
  5. Briggs, R., Dyke, G. V. & Knowles, G. - 1958 - Use of the Wide-bore Dropping mercury electrode for longer period recording of concentration of dissolved. Analyst, 83: (986) 304–311.CrossRefGoogle Scholar
  6. Brook, A. J., & Rzóska, J. - 1954 - The influence of the Gebel Aulyia Dam on the development of Nile Plankton. J. Anim. Ecol., 23: 101–104.CrossRefGoogle Scholar
  7. Brook, A. J. & Woodwards, W. B. - 1956 - Some observations on the effects of water inflow and outflow on the plankton of small lakes. J. Anim. Ecol., 25 (1): 22–25.CrossRefGoogle Scholar
  8. Buchanan, K. M. & Pugh, J. C. - 1955 - Land and People in Nigeria. Univ. of Lond. Press.Google Scholar
  9. Harrison Church, R. J. - 1953 - West Africa. Longmans Press. London.Google Scholar
  10. Daget, J. - 1957 - Données récentes sur la biologie des Poissons dans le delta central du Niger. Hydrobiologia, 9: 321–47.CrossRefGoogle Scholar
  11. Darnell, R. M. - 1961 - Trophic spectrum of an estuarine community, based of studies of Lake Pontchartrain, Louisiana. Ecology, 42: 553–67.CrossRefGoogle Scholar
  12. Enwenzor, W. O. - 1962 - The phosphorus status of some Nigerian soils. M. Sc. thesis. Univ. of London.Google Scholar
  13. Evans, J. H. - 1962 - The distribution of phytoplankton in some Central East African Waters. Hydrobiologia 19: 299–315.CrossRefGoogle Scholar
  14. General Climatic data taken from reports published by Dept. of Geography, University of Ibadan.Google Scholar
  15. Hickling, C. F. - 1961 - Tropical Inland Fisheries. Longmans Press. London.Google Scholar
  16. Hill, M. B. & Webb, J. E. - 1958 - The topography and physical features of Lagos harbour and Lagos Lagoon. Phil. Trans. B., 683: 319–333.CrossRefGoogle Scholar
  17. Holden, M. J. & Green, J. - 1960 - The hydrology and plankton of the River Sokoto. J. Anim. Ecol., 29: 65–84.CrossRefGoogle Scholar
  18. Hutchinson, G. E. - 1957 - A Treatise on Limnology. Geography, Physics and Chemistry, 1: 1015 pp.Google Scholar
  19. Imevbore, A. M. A. - 1965 - A Preliminary Check-list of the Planktonic organisms of Eleiyele Reservoir, Ibadan, Nigeria. J. West Afr. Sci. Ass. 10: 56–60.Google Scholar
  20. Miller, R. - 1952 - The climate of Nigeria. Geog., 37: 198–213.Google Scholar
  21. Mortimer, C. H. - 1941, 1942 - The exchange of dissolved substances between mud and water in lakes. J. Ecol., 29: 280–329; 30: 147–201.CrossRefGoogle Scholar
  22. Mortimer, C. H. - 1956 - The oxygen content of air-saturated fresh waters and aids in calculating percentage saturation. Mitt. int. Ver. Limnol., 6: 20 pp.Google Scholar
  23. Moss, R. P. - 1961 - A soil study of a part of South-western Nigeria. Ph. D. thesis. University of London.Google Scholar
  24. Newell, R. - 1965 - The role of detritus in the nutrition of two marine deposit feeders, the prosobranchHydrobia ulvae and the bivalveMacoma balthica. Proc. Zool. Soc. Lond. 144: 25–45.CrossRefGoogle Scholar
  25. Prowse, G. A. & Talling, J. F. - 1958 - The seasonal growth and succession of plankton algae in the White Nile. Limnol. and Oceanogr., 3: 222–238.CrossRefGoogle Scholar
  26. Ruttner, F. - 1953 - Fundamentals of Limnology. Univ. of Toronto Press.Google Scholar
  27. Wright, J. C. - 1954 - The hydrology of Atwood Lake, a floodcontrol Reservoir. Ecology, (3): 305–316.CrossRefGoogle Scholar

Copyright information

© Dr W. Junk Publishers 1966

Authors and Affiliations

  • A. M. A. Imevbore
    • 1
  1. 1.Department of ZoologyUniversity of IfeNigeria

Personalised recommendations