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Hydrobiologia

, Volume 546, Issue 1, pp 353–360 | Cite as

Combined Effects of Algal (Chlorella vulgaris) Food Level and Temperature on the Demography of Brachionus havanaensis (Rotifera): a Life Table Study

  • E. Lucía Pavón-Meza
  • S. S. S. Sarma
  • S. Nandini
Article

Abstract

We evaluated the combined effects of food (0.5 × 106, 1.0 × 106 and 2.0 × 106 cells ml−1 of Chlorella vulgaris) and temperature (15, 20 and 25 °C) on life history variables of B. havanaensis. Regardless of Chlorella density there was a steep fall in the survivorship of B. havanaensis at 25 °C. Both food level and temperature affected the fecundity of B. havanaensis. At any given food level, rotifers cultured at 15 °C showed extended but low offspring production. At 25 °C, offspring production was elevated, the duration of egg laying reduced and the fecundity was higher during the latter part of the reproductive period. The effect of food level was generally additive, at any given temperature, and higher densities of Chlorella resulted in higher offspring production. Average lifespan, life expectancy at birth and generation time were 2–3 times longer at 15 °C than at 25 °C. At 20 °C, these remained at intermediate levels. The shortest generation time (about 4 days) was observed at 25 °C. Gross and net reproductive rates and the rate of population increase (r) increased with increasing temperature and generally, at any given temperature, higher algal food levels contributed to higher values in these variables. The r varied from 0.11 to 0.66. The survival patterns and lower rates of reproduction at 15 °C suggest that the winter temperatures (10–15 °C) prevailing in many waterbodies in Mexico City allow this species to sustain throughout the year under natural conditions.

Keywords

temperature food concentration life history rotifer Brachionus 

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Copyright information

© Springer 2005

Authors and Affiliations

  • E. Lucía Pavón-Meza
    • 1
  • S. S. S. Sarma
    • 1
  • S. Nandini
    • 2
  1. 1.Laboratory of Aquatic Zoology Division of Research and Postgraduate StudiesNational Autonomous University of Mexico Campus IztacalaTlalnepantlaMexico
  2. 2.UIICSE, Division of Research and Postgraduate StudiesNational Autonomous University of Mexico; Campus IztacalaTlalnepantlaMexico

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