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Hydrobiologia

, Volume 267, Issue 1–3, pp 249–256 | Cite as

Zooplankton associations in East African lakes spanning a wide salinity range

  • J. Green
Article

Abstract

Abstract The zooplankton of 38 East African lakes has been analysed in terms of species richness and dominance. The conductivities of the lakes range from 48 to 72 500 µS cm−1 20 °C. The lakes generally contain more species of rotifers than either Copepoda or Cladocera. The number of species of rotifers begins to decline at a conductivity below 1000 µS cm−1, and falls to 2 or 3 species above 3000 µS cm−1. Similar reductions occur in the Copepoda and Cladocera.

Many species can be dominant at conductivities below 1000 µS cm−1, but the range is restricted progressively with increasing salinity. The dominant species of Rotifera, Copepoda and Cladocera change independently along the salinity gradient, but there are indications of interactions and modifications of community structure by predation and competition.

Key words

Rotifera Copepoda Cladocera species richness salinity 

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References

  1. Beadle, L. C. 1932. Scientific results of the Cambridge Expedition to the East African Lakes 1930–31. 4. The waters of some East African Lakes in relation to their fauna and flora. J. linn. Soc., (Zool.) 38: 157–211.Google Scholar
  2. Bryce, D. L., 1931. Report on the Rotifera: Mr Omer-Coopers investigation of the Abyssinian freshwaters (Dr Hugh Scott Expedition). Proc. zool. Soc. Lond. 1931: 865–878.Google Scholar
  3. Cannicci, G. & F. Almagia, 1947. Notizie sulla ‘facies’ planctonica di alcuni laghi della Fossa Galla. Bolletino Pesc. Pisc. Idrobiol. 2 n.s.: 54–77.Google Scholar
  4. Green, J., 1967. Associations of Rotifera in the zooplankton of the lake sources of the White Nile. J. zool. Lond. 151: 343–378.Google Scholar
  5. Green, J., 1986a. Associations of zooplankton in six crater lakes in Arizona, Mexico and New Mexico. J. zool. Lond. 208: 135–159.Google Scholar
  6. Green, J., 1986b. Zooplankton associations in some Ethiopian crater lakes. Freshwat. Biol. 16: 495–499.Google Scholar
  7. Green, J. & S. Mengestou, 1991. Specific diversity and community structure of Rotifera in a salinity series of Ethiopian inland waters. Hydrobiologia 209: 95–106.Google Scholar
  8. Jenkin, P. M., 1936. Reports on the Percy Sladen Expedition to some Rift Valley lakes in Kenya in 1929. VII. Summary of the ecological results with special reference to the alkaline lakes. Ann. Mag. nat. Hist. 18: 133–181.Google Scholar
  9. LaBarbera, M. C. & P. Kilham, 1974. The chemical ecology of copepod distribution in the lakes of East and Central Africa. Limnol. Oceanogr. 19: 459–465.Google Scholar
  10. Lowndes, A. G., 1936. Scientific results of the Cambridge Expedition to the East African Lakes 1930–31. 16. The smaller Crustacea. J. Linn. Soc., Zool. 40: 1–31.Google Scholar
  11. MacIntyre, S. & J. M. Melack, 1982. Meromixis in an equatorial African soda lake. Limnol. Oceanogr. 27: 595–609.Google Scholar
  12. Mengestou, S., J. Green & C. H. Fernando, 1991. Species composition, distribution and seasonal dynamics of Rotifera in a Rift Valley Lake in Ethiopia (Lake Awasa). Hydrobiologia 209: 203–214.Google Scholar
  13. Njuguna, S. G., 1988. Nutrient-phytoplankton relationships in a tropical meromictic soda lake. Hydrobiologia 158: 15–28.Google Scholar
  14. Nogrady, T., 1983. Succession of planktonic rotifer populations in some lakes of the Eastern Rift Valley, Kenya. Hydrobiologia 98: 45–54.Google Scholar
  15. Pejler, B., 1974. On the rotifer plankton of some East African lakes. Hydrobiologia: 389–396.Google Scholar
  16. Vareschi, E. & A. Vareschi, 1984. The ecology of Lake Nakuru (Kenya). IV. Biomass and distribution of consumer organisms. Oecologia (Berlin) 61: 70–82.Google Scholar

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • J. Green
    • 1
  1. 1.Centre for Research in Aquatic BiologyQueen Mary and Westfield CollegeLondonUK

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