Rotifera IX pp 75-83 | Cite as

Life table demography and population growth of Brachionus variabilis Hempel, 1896 in relation to Chlorella vulgaris densities

  • S. S. S. Sarma
  • S. Nandini
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 153)


We studied the life history variables and population growth characteristics of Brachionus variabilis, which was recorded for the first time from Mexico. The animals were fed Chlorella, using five concentrations (0.25, 0.5, 1, 2 and 4 × 106 cells ml−1) at 25 °C. Food density was observed to have significant effect on life expectancy, average lifespan, gross reproductive rate, net reproductive rate, generation time and population growth rate. The average lifespan ranged from 3 to 6 days depending on the food density. The net reproductive rate ranged from 2 to 7 neonates female−1 d−1. The rate of population increase per day varied from 0.14 to 0.35. The highest net reproductive rate and average lifespan and life expectancy were recorded at Chlorella concentrations of 1 × 106 and 2 − 106 cells ml−1.

Key words

Brachionus variabilis population growth demography Chlorella Rotifera 


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Copyright information

© Springer Science+Business Media Dordrecht 2001

Authors and Affiliations

  • S. S. S. Sarma
    • 1
  • S. Nandini
    • 1
  1. 1.Division of Research and Postgraduate StudiesNational Autonomous University of Mexico, Campus IztacalaTlalnepantlaMexico

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