, Volume 377, Issue 1–3, pp 177–181 | Cite as

Short-term variations in pelagic photosynthesis demand well-timed sampling to monitor long-term limnological changes in Lake Victoria

  • Jan H. Wanink
  • Jeremiah J. Kashindye


Oxygen concentration and water transparency at two offshore stations in Lake Victoria varied significantly during a few hours around noon. This affects comparative limnological research on changes in oxygenation after a period of perturbation. Most of the recently published papers on this subject do not account for sampling time, whereas our data show the importance of well-timed sampling programmes.

Lake Victoria oxygen transparency pelagic photosynthesis 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Akiyama, T., A. A. Kajumulo & S. Olsen, 1977. Seasonal variations of plankton and physicochemical condition in Mwanza Gulf, Lake Victoria. Bull. Freshwat. Fish. Res. Lab. 27: 49–61.Google Scholar
  2. Benson, B. B. & D. Krause Jr., 1980. The concentrations and isotopic fractionation of gases dissolved in freshwater in equilibrium with the atmosphere. 1. Oxygen. Limnol. Oceanogr. 25: 662–671.Google Scholar
  3. De Beer, M., 1989. Light measurements in Lake Victoria, Tanzania. Ann. Mus. r. Afr. c., Zool. 257: 57–60.Google Scholar
  4. Carpenter, S. R. & J. F. Kitchell, 1993. The trophic cascade in lakes. Cambridge University Press, Cambridge. 385 pp.Google Scholar
  5. Goldschmidt, T., F. Witte & J. Wanink, 1993. Cascading effects of the introduced Nile perch on the detritivorous/ phytoplanktivorous species in the sublittoral areas of Lake Victoria. Conserv. Biol. 7: 686–700.CrossRefGoogle Scholar
  6. Gophen, M., P. B. O. Ochumba & L. S. Kaufman, 1995. Some aspects of perturbation in the structure and biodiversity of the ecosystem of Lake Victoria (East Africa). Aquat. living Resour. 8: 27–41.Google Scholar
  7. Gophen, M., P. B. O. Ochumba, U. Pollingher & L. S. Kaufman, 1993. Nile perch (Lates niloticus) invasion in Lake Victoria (East Africa). Verh. int. Ver. Limnol. 25: 856–859.Google Scholar
  8. Graham, M., 1929. The Victoria Nyanza and its fisheries. A report on the fishing survey of Lake Victoria 1927–1928. Crown Agents for the Colonies, London. 225 pp.Google Scholar
  9. Hecky, R. E., 1993. The eutrophication of Lake Victoria. Verh. int. Ver. Limnol. 25: 39–48.Google Scholar
  10. Hecky, R. E. & F. W. B. Bugenyi, 1992. Hydrology and chemistry of the African Great Lakes and water quality issues: Problems and solutions. Mitt. int. Ver. theor. angew. Limnol. 23: 45–54.Google Scholar
  11. Hecky, R. E., F. W. B. Bugenyi, P. Ochumba, J. F. Talling, R. Mugidde, M. Gophen & L. Kaufman, 1994. Deoxygenation of the deep water of Lake Victoria, East Africa. Limnol. Oceanogr. 39: 1476–1481.CrossRefGoogle Scholar
  12. Kaufman, L., 1992. Catastrophic change in species-rich freshwater ecosystems: the lessons of Lake Victoria. BioScience 42: 846–858.CrossRefGoogle Scholar
  13. Mugidde, R., 1993. The increase in phytoplankton primary productivity and biomass in Lake Victoria (Uganda). Ver. int. Ver. Limnol. 25: 846–849.Google Scholar
  14. Ochumba, P. B. O. & D. I. Kibaara, 1989. Observations on bluegreen algal blooms in the open waters of Lake Victoria, Kenya. Afr. J. Ecol. 27: 23–34.Google Scholar
  15. Talling, J. F., 1966. The annual cycle of stratification and phytoplankton growth in Lake Victoria (East Africa). Int. Rev. ges. Hydrobiol. 51: 545–621.Google Scholar
  16. Wanink, J. H., M. R. Berger & F. Witte, 1993. Kingfishers at Fishburger Queens: eating Victorian fast food on the wing. Ann. Mus. r. Afr. c., Zool. 268: 319–326.Google Scholar
  17. Witte, F., T. Goldschmidt, P. C. Goudswaard, W. Ligtvoet, M. J. P. Van Oijen & J. H. Wanink, 1992. Species extinction and concomittant ecological changes in Lake Victoria. Neth. J. Zool. 42: 214–232.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Jan H. Wanink
  • Jeremiah J. Kashindye

There are no affiliations available

Personalised recommendations