Control of sexuality in Asplanchna brightwelli: threshold levels of dietary tocopherol and modification of tocopherol response by exogenous and endogenous factors

  • John J. Gilbert
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 14)


Ingestion of one prey rotifer containing about 0.02 pg tocopherol was sufficient to cause young amictic females to produce a high proportion of mictic daughters. Varying the concentration of emulsified tocopherol and the population density of amictic females suggested that mictic-female induction approached an all-or-nothing response at relatively high population densities and increased with population density only when population densities were very low. Amictic females hatching from resting eggs were less likely to produce mictic daughters than those hatching from parthenogenetic eggs.


rotifers Asplanchna population dynamics resting egg sexuality tocopherol 


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  1. Birky, C. W. Jr., 1969. The developmental genetics of polymorphism in the rotifer Asplanchna. III. Quantitative modification of developmental responses to vitamin E, by the genome, physiological state and population density of responding females. J. exp. Zool. 170: 437–448.PubMedCrossRefGoogle Scholar
  2. Dumont, H. J., I. Van de Velde & S. Dumont, 1975. The dry weight estimate of biomass in a selection of Cladocera, Copepoda and Rotifera from the plankton, periphyton and benthos of continental waters. Oecologia 19: 75–97.CrossRefGoogle Scholar
  3. Gilbert, J. J., 1968. Dietary control of sexuality in the rotifer Asplanchna brightwelli Gosse. Physiol. Zool. 41: 14–43.Google Scholar
  4. Gilbert, J. J., 1974. Effect of tocopherol on the growth and development of rotifers. Am. J. clin. Nutr. 27: 1005–1016.PubMedGoogle Scholar
  5. Gilbert, J. J., 1975. Polymorphism and sexuality in the rotifer Asplanchna, with special reference to the effects of preytype and clonal variation. Arch. Hydrobiol. 75: 442–483.Google Scholar
  6. Gilbert, J. J., 1980a. Female polymorphism and sexual reproduction in the rotifer Asplanchna: evolution of their relationship and control by dietary tocopherol. Am. Nat. 116: 409–431.CrossRefGoogle Scholar
  7. Gilbert, J. J., 1980b. Developmental polymorphism in the rotifer Asplanchna sieboldi. Am. Sci. 68: 636–646.Google Scholar
  8. Gilbert, J. J. & J. R. Litton, Jr., 1978. Sexual reproduction in the rotifer Asplanchna girodi: effects of tocopherol and population density. J. exp. Zool. 204: 113–122.CrossRefGoogle Scholar
  9. Gilbert, J. J. & G. A. Thompson, Jr., 1968. Alpha-tocopherol control of sexuality and polymorphism in the rotifer Asplanchna. Science 159: 734–736.PubMedCrossRefGoogle Scholar
  10. Hiño, A. & R. Hirano, 1977. Ecological studies on the mechanism of bisexual reproduction in the rotifer Brachionus plicatilis-2. Effects of cumulative parthenogenetic generation on the frequency of bisexual reproduction. Bull. jap. Soc. Scient. Fish. 43: 1147–1155.Google Scholar
  11. Huribert, S. H., M. S. Mulla & H. R. Willson, 1972. Effects of an organophosphorus insecticide on the phytoplankton, zooplankton, and insect populations of freshwater ponds. Ecol. Monogr. 42: 269–299.CrossRefGoogle Scholar
  12. Litton, J. R. Jr. & J. J. Gilbert, 1976. Assimilation and retention of tocopherol and chlorophylls in the rotifers Brachionus calyciflorus and Asplanchna sieboldi. Experientia 32: 1530–1532.CrossRefGoogle Scholar
  13. Luntz, A., 1926. Untersuchungen über den Generationswechsel der Rotatorien. 1. Die Bedingungen des Generationswechsels. Biol. Zb. 46: 233–278.Google Scholar
  14. Maly, E. J., 1975. Interactions among the predatory rotifer Asplanchna and two prey, Paramecium and Euglena. Ecology 56: 346–358.CrossRefGoogle Scholar
  15. Miwa, I., H. Nobuzuki & K. Hiwatashi, 1975. Immaturity substances: material basis for immaturity in Paramecium. J. Cell Sci. 19: 369–378.PubMedGoogle Scholar
  16. Sokal, R. R. & F. J. Rohlf, 1969. Biometry. W. H. Freeman and Company San Francisco, 776 pp.Google Scholar
  17. Wesenberg-Lund, C., 1930. Contributions to the biology of the Rotifera. 2. The periodicity and sexual periods. K. danske Vidensk. Selsk. Skr. 9: 1–230.Google Scholar

Copyright information

© Dr W. Junk Publishers, The Hague 1983

Authors and Affiliations

  • John J. Gilbert
    • 1
  1. 1.Department of Biological SciencesDartmouth CollegeHanoverUSA

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