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Effects of Climate and Human Activities on the Ecosystem of Lake Baringo, Kenya

  • P. A. Aloo
Chapter
Part of the Advances in Global Change Research book series (AGLO, volume 12)

Abstract

Since the beginning of the last century, the Lake Baringo ecosystem has undergone several ecological changes. Most of the changes are a result of human activities within the catchment basin and changes in climatic conditions. Currently, the most significant limnological feature of the lake is its extreme turbidity with an average secchi disc reading of 9.5 cm. The lake water is brownish and muddy because of considerable siltation resulting from high rates of soil erosion caused by overgrazing by livestock and deforestation of the surrounding hills. Due to increased siltation, the bed of the lake in the open waters is virtually devoid of invertebrate life. Primary production in the open waters is very low as the only phytoplankton present are positively buoyant species such as Microcystis aeruginosa, Melosira granulata and Anabaena carcinalis. The depth of the lake has a significant effect on the transparency of the water (P<0.001), where transparency decrease with depth. Under normal conditions, Lake Baringo has low alkalinity, but with less rain, the lake has become more saline with an average conductivity of 660 μS cm−1 while the pH varies between 8.9 and 10.5. Five species of fish have been reported to occur in Lake Baringo: Oreochromis niloticus (Trewavas, 1983), Protopterus aethiopicus (Heckel, 1851), Glarias gariepinnus (Butchell, 1852), Barbus intermedius (Ruppell, 1836) and Labeo cylindricus (Peters, 1852). Presently, the species composition is dominated by Oreochromis (80.04%), Glarias (9.8%), and Protopterus (7.95%). Barbus rarely appear in the fisherman’s catches while Labeo has almost disappeared from the lake since the damming of the inflowing rivers which interfered with its breeding habits. Moreover statistical analysis has shown a significant relationship between fish yield and lake level changes (P<0.001).

Keywords

Soil Erosion Lake Level Microcystis Aeruginosa Clarias Gariepinus Lake Level Change 
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.

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References

  1. Chapman, L., Chapman C., Kaufman, L., and Liem K. (1992) The role of papyrus swamps as barriers of fish dispersal. A case study and implications for fish diversity in lake Victoria basin. In Biodiversity, Fisheries and the Future of Lake Victoria Conference Abstracts p. 6.Google Scholar
  2. Copley, H. (1948) The Lakes and Rivers of Kenya. Highway Press, Longman's Green and Company, Nairobi.Google Scholar
  3. Fisheries Department Annual Report (2000). Lake Baringo Fish Statistics, Unpublished Report.Google Scholar
  4. Kallviqst, (1976) A Study of Lake Baringo Water Chemistry. A report submitted to the Fisheries Department, 53 p.Google Scholar
  5. Kenya Marine and Fisheries Research Institute (2000). Annual Report.Google Scholar
  6. Kolding, J. (1995) Changes in species composition and abundance of fish populations in Lake Turkana, Kenya, in T.J. Pitcher and H.B. Hart (eds.) The Impact of Species Changes in African Lakes, pp. 336363.Google Scholar
  7. Lewis, M.N. (1998) A Guide to Lake Baringo and Lake Bogoria Horizon Books, 161p.CrossRefGoogle Scholar
  8. Lowe McConell, R.H. (1987) Ecological Studies in Tropical Fish Communities. Cambridge Tropical Biology Series, 382 p.Google Scholar
  9. Mann, M.J. (1971) Some taxonomical notes on the fish fauna of the Baringo area. African Journal of Tropical Hydrobiology and Fisheries 1, 25 - 34.Google Scholar
  10. National Museums of Kenya (1998) Annual Bird Count Report.Google Scholar
  11. Okorie, O.O(1973) On the bionomics and population structure of non cichlid fishes in Lake Baringo. Report of East African Freshwater Research Organisation (EAFRO) Jinja, Uganda.Google Scholar
  12. Okorie, O.O. (1975) On the bionomics and population structure of Tilapia nilotica (Linnaeus 1775) in Lake Baringo, Kenya. African Journal of Tropical Hydrobiology and Fisheries 4 (2), 192 - 218.Google Scholar
  13. Ohio, C.O. (1993) Changes in Fish Populations and Effects of Fishing Gear in Lake Baringo Fishery Management. Discussion Paper No. I.Google Scholar
  14. Pitcher, T.J. (1995) Species changes and fisheries in African lakes: Outline of the issue, in T.J. Pitcher and H.B.Hart (eds.) The Impact of Species Changes in African Lakes. Chapman and Hall, pp 1 - 16.Google Scholar
  15. Ssentongo, G.W. (1974) On the fish and fisheries of Lake Baringo. African Journal of TropicalHydrobiology and Fisheries 3 (1), 95 - 105.Google Scholar
  16. Ssentongo, G.W. (1996) Report on the Present Fisheries Situation of Lake Baringo, Kenya, FAO Fisheries Department Publication, 10 p.Google Scholar
  17. Tailing, J.F. and Tailing, T.B. (1965) The chemical composition of African lakes. Internationale. Revue der Gesampten Hydrobiologie 50, 421 - 463.CrossRefGoogle Scholar
  18. Van Someren, V.D. ( 1949 ) Report on Lake Baringo Fisheries October 1994. Kenya Game Department Lies.Google Scholar
  19. Wonhington, E.B. and Riccardo, C. (1936). Scientific Results of the Cambridge Expedition to the East African Lakes (1030-1931) No.15. The fish of Lake Rudolf and Lake Baringo. Zoological Journal of Linnean Society 39, 353 - 389.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • P. A. Aloo
    • 1
  1. 1.Department of ZoologyKenyatta UniversityNairobiKenya

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