Hydrobiologia

, Volume 636, Issue 1, pp 463–478 | Cite as

Diatom evidence for the timing and causes of eutrophication in Lake Victoria, East Africa

  • J. Curt Stager
  • Robert E. Hecky
  • Dustin Grzesik
  • Brian F. Cumming
  • Hedy Kling
Primary research paper

Abstract

The determination of the history and causes of recent eutrophication and intensified thermal stratification in Lake Victoria is still hampered by the sparsity of paleolimnologic coverage of the enormous lake. Five new diatom records from Ugandan waters now show that a transition from Aulacoseira-dominated planktonic assemblages to those dominated by long Nitzschia spp., occurred in northern coastal sites from the mid-1970s to mid-1980s. Similar transitions developed from the late 1960s to early 1970s offshore and from the 1940s to early 1950s along the Kenyan coast, suggesting a time-transgressive process. These changes are not readily attributable to the trophic effects of Nile perch population growth during the early 1980s, but more likely reflect responses to long-term nutrient enrichment and climatic instability in the region. The diversity of planktonic diatom communities has declined dramatically, and a namesake variety of Aulacoseira nyassensis may now be nearly extirpated. Although local phytoplankton communities varied considerably in the past, the current domination of diatom assemblages by Nitzschia is apparently unprecedented in the 15,000-year history of Lake Victoria.

Keywords

Africa Diatoms Eutrophication Lake Victoria Paleolimnology 

References

  1. Acere, T. O., 1984. Observations on the Biology, Age, Growth, Maturity and Sexuality of Nile Perch, Lates niloticus (Linne), and the Growth of its Fishery in the Northern Waters of Lake Victoria. Appendix D, Annex 1.2, FAO Fisheries Report 335: 145.Google Scholar
  2. Balirwa, J. S., C. A. Chapman, L. J. Chapman, I. G. Cowx, K. Geheb, L. Kaufman, R. H. Lowe-McConnell, O. Seehausen, J. H. Wanink, R. L. Welcomme & F. Witte, 2003. Biodiversity and fishery sustainability in the Lake Victoria basin: an unexpected marriage? BioScience 53: 703–715.CrossRefGoogle Scholar
  3. Barel, C. D. N., R. Dorit, P. H. Greenwood, G. Fryer, N. Hughes, P. B. N. Jackson, H. Kawanabe, R. H. Lowe-McConnell, M. Nagoshi, A. J. Ribbink, E. Trewavas, F. Witte & K. Yamaoka, 1985. Destruction of fisheries in Africa’s lakes. Nature 315: 19–20.CrossRefGoogle Scholar
  4. Binford, M., 1990. Calculation and uncertainty analysis of 210-Pb dates for PIRLA project lake sediment cores. Journal of Paleolimnology 3: 253–267.CrossRefGoogle Scholar
  5. Bootsma, H. & R. E. Hecky, 1993. Conservation of the African Great Lakes: a limnological perspective. Conservation Biology 7: 644–656.CrossRefGoogle Scholar
  6. Crul, R. C. M., 1995. Limnology and Hydrology of Lake Victoria. UNESCO/IHP-IV Project M-5.1. UNESCO Publishing.Google Scholar
  7. Gikuma-Njuru, P. & R. E. Hecky, 2005. Nutrient concentrations in Nyanza Gulf, Lake Victoria, Kenya: light limits algal demand and abundance. Hydrobiologia 534: 131–140.CrossRefGoogle Scholar
  8. 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. Conservation Biology 7: 686–700.CrossRefGoogle Scholar
  9. Hay, S. I., J. Cox, D. J. Rogers, S. E. Randolph, D. I. Stern, G. D. Shanks, M. F. Myers & R. W. Snow, 2002. Climate change and the resurgence of malaria in the East African highlands. Nature 415: 905–909.CrossRefPubMedGoogle Scholar
  10. Hecky, R. E., 1993. The eutrophication of Lake Victoria. Verdhanlungen Internationale Vereinigung fur Limnologie 25: 39–48.Google Scholar
  11. Hecky, R. E., R. Mugidde, P. S. Ramlal, M. R. Talbot & G. W. Kling, 2009. Multiple stressors cause rapid ecosystem change in Lake Victoria. Freshwater Biology (in press).Google Scholar
  12. 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. Limnology and Oceanography 39: 1476–1481.CrossRefGoogle Scholar
  13. Hecky, R. E., H. A. Bootsma, R. Mugidde & F. W. B. Bugenyi, 1996. Phosphorus pumps, nitrogen sinks, silicon drains: plumbing nutrients in the African Great Lakes. In Johnson, T. C. & E. Odada (eds), The Limnology, Climatology and Paleoclimatology of the East African Lakes. Gordon & Breach, Newark: 205–224.Google Scholar
  14. Johnson, T. C., C. A. Scholz, M. R. Talbot, K. Kelts, R. D. Ricketts, G. Ngobi, K. Beuning, I. Ssemmanda & J. M. McGill, 1996. Late pleistocene desiccation of Lake Victoria and rapid evolution of cichlid fishes. Science 273: 1091–1093.CrossRefPubMedGoogle Scholar
  15. Kanamitsu, M., W. Ebisuzaki, J. Woollen, S.-K. Yang, J. J. Hnilo, M. Fiorino & G. L. Potter, 2002. NCEP-DOE AMIP-II Reanalysis (R-2). Bulletin of the American Meteorological Society 83: 1631–1643.CrossRefGoogle Scholar
  16. Kaufman, L., & P. Ochumba, 1993. Evolutionary and conservation biology of cichlid fishes as revealed by faunal remnants in northern Lake Victoria. Conservation Biology 7: 719–730.Google Scholar
  17. Kilham, P., S. S. Kilham & R. E. Hecky, 1986. Hypothesized resource relationships among African planktonic diatoms. Limnology and Oceanography 31: 1169–1181.CrossRefGoogle Scholar
  18. Kling, H. J., R. Mugidde & R. E. Hecky, 2001. Recent changes in the phytoplankton community of Lake Victoria in response to eutrophication. In Munawar, M. & R. E. Hecky (eds), The Great Lakes of the World (GLOW): Food-web, Health, and Integrity. Backhuys, Leiden: 47–65.Google Scholar
  19. Kolding, J., P. van Zwieten, O. Mkumbo, G. Silsbe & R. E. Hecky, 2008. Are the Lake Victoria fisheries threatened by exploitation or eutrophication? Towards an ecosystem based approach to management. In Bianchi, R. & H. R. Skjoldal (eds), The ecosystem approach to fisheries. CABI Publishing, Rome: 309–354Google Scholar
  20. Kudhongania, A. W., D. L. Ocenodongo & J. O. Okaronon, 1998. Anthropogenic perturbations on the Lake Victoria ecosystem. In Johnson, T. C. & E. Odada (eds), The Limnology, Climatology, and Paleoclimatology of the East African Lakes. Gordon & Breach, Newark: 625–632.Google Scholar
  21. Lehman, J. T., 1997. How climate change is shaping Lake Victoria. IDEAL Bulletin, Spring: 1–2.Google Scholar
  22. Lehman, J. T., 1998. Role of climate in the modern condition of Lake Victoria. Theoretical and Applied Climatology 61: 29–37.CrossRefGoogle Scholar
  23. Lehman, J. T., R. Mugidde & D. A. Lehman, 1998. Lake Victoria plankton ecology: mixing depth and climate-driven control of lake conditions. In Lehman, J. T. (ed.), Environmental Change and Response in East African Lakes. Kluwer, Dordrecht: 99–116.Google Scholar
  24. Lipiatou, E., R. E. Hecky, S. J. Eisenreich, L. Lockhart, D. Muir & P. Wilkinson, 1998. Recent ecosystem changes in Lake Victoria reflected in sedimentary natural and anthropogenic organic compounds. In Johnson, T. C. & E. Odada (eds), The Limnology, Climatology, and Paleoclimatology of the East African Lakes. Gordon & Breach, Newark: 523–541.Google Scholar
  25. Mugidde, R., 1993. The increase in phytoplankton primary productivity and biomass in Lake Victoria (Uganda). Verdhanlungen Internationale Vereinigung fur Limnologie 25: 846–849.Google Scholar
  26. Mugidde, R., R. E. Hecky, L. L. Hendzel & W. D. Taylor, 2003. Pelagic nitrogen fixation in Lake Victoria (East Africa). Journal of Great Lakes Research 29(supplement 2): 76–83.Google Scholar
  27. Nicholson, S. E. & X. Yin, 2001. Rainfall conditions in equatorial East Africa during the nineteenth century as inferred from the record of Lake Victoria. Climate Change 48: 387–398.CrossRefGoogle Scholar
  28. O’Reilly, C. M., S. R. Alin, P.-D. Plisnier, A. S. Cohen & B. A. McKee, 2003. Climate change decreases aquatic ecosystem productivity of Lake Tanganyika, Africa. Nature 424: 766–768.CrossRefPubMedGoogle Scholar
  29. Ochumba, P. B. O. & D. I. Kibaara, 1989. Observations on blue-green algal blooms in the open waters of Lake Victoria, Kenya. African Journal of Ecology 27: 23–34.CrossRefGoogle Scholar
  30. Ostenfeld, C. H., 1908. Phytoplankton aus dem Victoria Nyanza. Sammelausbeute von A. Bogert, 1904-1905. Botanisches Jahrbuch 41: 330–350.Google Scholar
  31. Prunier, G., 1995. The Rwanda Crisis: History of a Genocide. Columbia University Press, NY.Google Scholar
  32. Ryves, D. B., R. W. Battarbee, S. Juggins, S. C. Fritz & N. J. Anderson, 2006. Physical and chemical predictors of diatom dissolution in freshwater and saline lake sediments in North America and West Greenland. Limnology and Oceanography 51: 1355–1368.CrossRefGoogle Scholar
  33. Stager, J. C., 1984. The diatom record of Lake Victoria (East Africa): the last 17,000 years. In Mann, D. G. (ed.), Proceedings of the Seventh International Diatom Symposium, Philadelphia, 1982. Strauss & Cramer, Koenigstein: 455–476.Google Scholar
  34. Stager, J. C., 1998. Ancient analogues for recent environmental changes at Lake Victoria, East Africa. In Lehman, J. T. (ed.), Environmental Change and Response in East African Lakes. Kluwer, Dordrecht: 37–46.Google Scholar
  35. Stager, J. C. & T. C. Johnson, 2000. A 12,400 14C yr offshore diatom record from east central Lake Victoria, East Africa. Journal of Paleolimnology 23: 373–383.CrossRefGoogle Scholar
  36. Stager, J. C. & T. Johnson, 2007. The late Pleistocene desiccation of Lake Victoria and the origin of its endemic biota. Hydrobiologia 596: 5–16.CrossRefGoogle Scholar
  37. Stager, J. C., B. F. Cumming & L. D. Meeker, 1997. An 11, 400-year, high-resolution diatom record from Lake Victoria, East Africa. Quaternary Research 47: 81–89.CrossRefGoogle Scholar
  38. Stager, J. C., B. F. Cumming & L. D. Meeker, 2003. A 10,000 year high-resolution diatom record from Pilkington Bay, Lake Victoria, East Africa. Quaternary Research 59: 172–181.CrossRefGoogle Scholar
  39. Stager, J. C., A. Ruzmaikin, D. Conway, P. Verburg & P. J. Mason, 2007. Solar variability, ENSO, and the levels of Lake Victoria, East Africa. Journal of Geophysical Research 112: D15106. doi:10.1029/2006JD008362.CrossRefGoogle Scholar
  40. Sutcliffe, J. V. & Y. P. Parks, 1999. The Hydrology of the Nile. International Association of Hydrological Sciences Special Publication No. 5. ISBN: 1-901502-75-9.Google Scholar
  41. Talling, J. F., 1957. Some observations on the stratification of Lake Victoria. Limnology and Oceanography 2: 213–221.Google Scholar
  42. Talling, J. F., 1965. The photosynthetic activity of phytoplankton in East African lakes. Internationale Review ges Hydrobiologie 50: 1–32. Google Scholar
  43. Talling, J. F., 1966. The annual cycle of stratification and phytoplankton growth in Lake Victoria (East Africa). Internationale Revue der gesamten Hydrobiologie 51: 545–621.CrossRefGoogle Scholar
  44. Tamatamah, R. L., H. C. Duthie & R. E. Hecky, 2005. The importance of atmospheric deposition to the phosphorus loading of Lake Victoria (East Africa). Biogeochemistry 73: 325–344.CrossRefGoogle Scholar
  45. Verburg, P., R. E. Hecky & H. Kling, 2003. Ecological consequences of a century of warming in Lake Tanganyika. Science 301: 505–507.CrossRefPubMedGoogle Scholar
  46. Verschuren, D., D. N. Edgington, H. Kling & T. C. Johnson, 1998. Silica depletion in Lake Victoria: sedimentary signals at offshore stations. Journal of Great Lakes Research 24: 118–130.Google Scholar
  47. Verschuren, D., T. C. Johnson, H. Kling, D. N. Edgington, P. R. Leavitt, E. T. Brown, M. R. Talbot & R. E. Hecky, 2002. History and timing of human impact on Lake Victoria, East Africa. Proceedings of the Royal Society B: Biological Sciences 269: 289–294.Google Scholar
  48. Vollmer, M. K., et al., 2005. Deep-water warming trend in Lake Malawi, East Africa. Limnology and Oceanography 50: 727–732.CrossRefGoogle Scholar
  49. Worthington, E. B., 1930. Observations on the temperature, hydrogen-ion concentration, and other physical conditions of the Victoria and Albert Nyanzas. Internationale Revue der gesamten Hydrobiologie 25: 328–357.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • J. Curt Stager
    • 1
  • Robert E. Hecky
    • 2
  • Dustin Grzesik
    • 1
  • Brian F. Cumming
    • 3
  • Hedy Kling
    • 4
  1. 1.Natural Sciences DivisionPaul Smith’s CollegePaul SmithsUSA
  2. 2.Department of Biology and Large Lakes ObservatoryUniversity of Minnesota-DuluthDuluthUSA
  3. 3.P.E.A.R.L., Biology DepartmentQueen’s UniversityKingstonCanada
  4. 4.Algal Taxonomy and Ecology Inc.WinnipegCanada

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