Is food availability the main factor controlling the abundance of Euchlanis dilatata lucksiana Hauer in a shallow, hypertrophic lake?

  • J. Ejsmont-Karabin
  • R. D. Gulati
  • J. Rooth
Part of the Developments in Hydrobiology book series (DIHY, volume 52)


Visual observations and experiments on food preference of Euchlanis dilatata lucksiana show that this euchlanid can feed on blue-green algae not consumed by the most planktonic animals. Nevertheless, even in lakes with blooms of blue-green algae, E. d. lucksiana occur infrequently and generally in low numbers. The paper is an attempt to explore into the causes for the rare occurrence of Euchlanis in the pelagial. A comparison of threshold food concentrations calculated from N and P excretion rates (Gulati et al., this volume) with the concentrations of seston in the Lake Loosdrecht shows that the latter were several times higher during study period in 1984. This implies that the food requirements of Euchlanis were always satisfied in this lake. The time needed for the consumption of the total food fraction in a liter of lake water by a concentration of 50 Euchlanis 1-1 was also calculated. This time varied from 70 to 200 days, so a Euchlanis population even at its maximum density will not cause major changes in blue-green algae biomass by grazing. Thus, food limitation cannot be viewed as a factor controlling the Euchlanis densities in Loosdrecht Lakes. There is some evidence that Euchlanis is heavily predated in Loosdrecht Lakes, losses in its biomass accounting for 126% of the production. Adaptation of this species to the littoral zone, as expressed by the deposition of eggs on plants, can also limit the occurrence of the lucksiana form to water bodies with blooms of blue-green algae.

Key words

Euchlanis dilatata lucksiana blue-green algae threshold concentrations of food trophic conditions predation 


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  1. Bazilevitsch, V. M., 1985. Rotifera of some canals of southern Ukraine. In L. A. Kutikova (ed.), Rotatoria, Proceedings of the National Rotifer Symposium. Nauka, Leningrad: 205–208. (in Russian).Google Scholar
  2. Benndorf, J. & W. Horn, 1985. Theoretical considerations on the relative importance of food limitation and predation in structuring zooplankton communities. Arch. Hydrobiol. Beih. Ergebn. Limnol. 21: 383–396.Google Scholar
  3. Boesewinkel-de Bruyn, P. J., L. van Liere & B. Z. Salome, 1984. Phytoplankton species composition. In S. Parma & R. D. Gulati (eds), Limnological Institute, Progress Report 1983. Verh. Kon. Ned. Akad. Wet., Afd. Nat., Tweede Reeks, 82.Google Scholar
  4. Carlin, B., 1943. Die Planktonrotatorien des Motalastrôm. Medd. Lunds Univ. Limnol. Inst. 5: 260 pp.Google Scholar
  5. Dumont, H. J., 1977. Biotic factors in the population dynamics of rotifers. Arch. Hydrobiol. Beih. Ergebn. Limnol. 8: 98–122.Google Scholar
  6. Duncan, A. & R. D. Gulati, 1983. Feeding studies with natural food particles on tropical species of planktonic rotifers. In F. Schiemer (ed.), Limnology of Parakrama Samudra — Sri Lanka: a case study of an ancient man-made lake in the tropics. Developments in Hydrobiology 12: 117–125.Google Scholar
  7. Ejsmont-Karabin, J., 1984. Phosphorus and nitrogen excretion by lake zooplankton (rotifers and crustaceans) in relationship to individual body weights of the animals, ambient temperature and presence or absence of food. Ekol. pol. 32: 3–42.Google Scholar
  8. Gulati, R. D. (in press). Zooplankton structure in Loosdrecht Lakes in relation to the trophic status and the recent restoration measures. Hydrobiologia.Google Scholar
  9. Gulati, R. D., J. Rooth & J. Ejsmont-Karabin, 1987. A laboratory study of feeding and assimilation in Euchlanis dilatata lucksiana. Hydrobiologia 147: 289–296.CrossRefGoogle Scholar
  10. Gulati, R.D., K. Siewertsen & G. Postema, 1982. The zooplankton: its community structure, food and feeding and its role in the ecosystem of Lake Vechten. Hydrobiologia 95: 127–163.CrossRefGoogle Scholar
  11. Gulati, R. D., J. Ejsmont-Karabin, J. Rooth & K. Siewertsen, 1989. A laboratory study of phosphorus and nitrogen excretion of Euchlanis dilatata lucksiana. this volume.Google Scholar
  12. Karabin, A., 1985a. Pelagic zooplankton (Rotatoria + Crustacea) variation in the process of lake eutrophication. I. Structural and quantitative features. Ekol. pol. 33: 567–616.Google Scholar
  13. Karabin, A., 1985b. Pelagic zooplankton (Rotatoria + Crustacea) variation in the process of lake eutrophication. II. Modifying effect of biotic agents. Ekol. pol. 33:617–644.Google Scholar
  14. Kosova, A. A., 1985. Ecological characteristics of Rotifera of reservoirs of the Volga Delta. In L. A. Kutikova (ed.), Rotatoria, Proceedings of the National Rotifer Symposium, Nauka, Leningrad: 199–204. (in Russian).Google Scholar
  15. Koste, W., 1978. Rotatoria, Monogononta. Die Rädertiere Mitteleuropas. Gebrüder Borntraeger, Stuttgart, Vols 1 & 2, 673 pp., 234 pls.Google Scholar
  16. Kutikova, L. A., 1970. Rotifer Fauna USSR. Fauna USSR. 104. Acad. Nauk. SSSR, Leningrad, 744 pp. (in Russian).Google Scholar
  17. Lair, N., 1980. The rotifer fauna of the river Loire (France), at the level of the nuclear power plants. Hydrobiologia 73: 153–162.CrossRefGoogle Scholar
  18. Matveeva, L. K., 1986. Pelagic rotifers of Lake Glubokoe from 1897 to 1984. Hydrobiologia 141: 45–54.CrossRefGoogle Scholar
  19. Rooth, J., 1985. Een laboratoriumstudie van het metabolisme van de rotiferen — soort Euchlanis dilatata lucksiana uit de Loosdrechtse Plassen. Limnologisch Instituut Nieuwersluis/Oosterzee, Studentenverslag nr. 1985–5, 50 pp. (in Dutch).Google Scholar
  20. Spodniewska, I., 1983. Ecological characteristics of lakes in north-eastern Poland versus their trophic gradient. VI. The phytoplankton of 43 lakes. Ekol. poi. 31: 353–382.Google Scholar
  21. Van Densen, W. L. T., C. Dijkers & R. Veerman, 1986. The fish community of the Loosdrecht Lakes and the perspective for biomanipulation. Hydrobiol. Bull. 20: 147–163.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • J. Ejsmont-Karabin
    • 1
  • R. D. Gulati
    • 2
  • J. Rooth
    • 2
  1. 1.Institute of EcologyPolish Academy of SciencesMikołajkiPoland
  2. 2.Vijverhof LaboratoryLimnological InstituteNieuwersluisThe Netherlands

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