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Changes in growth and size of Keratella cochlearis (Gosse) in relation to some environmental factors in cultures

  • Kåre Lindström
Part of the Developments in Hydrobiology book series (DIHY, volume 14)

Abstract

Keratella cochlearis (Gosse) was cultured non-axenically in Carefoot medium diluted with Erken water at 5 °C, 15°C and 20°C with Rhodomonas minuta(Skuja) as a food alga. The rotifer reached ca. 120 ind. ml-1, having generation times of 2–7 days, a Q10-value of ca. 2, and at the lowest temperature >20% longer posterior spines. When co-cultured with Chlorella sp., at 0–30 mg Ca 1-1 and 1.6 meq NaHCO3 1-1 in medium L 11 at 20 °C, the maximum generation time and individual numbers were 3–4 days and up to 100 ind. ml-1, respectively. Animal numbers increased in relation to nutrient multiples, up to two multiples, of the culture medium L 16. Growth and length were reduced, although the width increased above two multiples of this culture medium. The trace metal tolerance was broad and increased additions of a metal mixture (L 11) slightly increased the length of the rotifers. No major changes in the length were observed when HC03 or Ca were varied in the culture medium (L 11), although a decrease in the length was noted in old cultures.

Keywords

rotifers Keratella cochlearis growth size culture food algae 

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Copyright information

© Dr W. Junk Publishers, The Hague 1983

Authors and Affiliations

  • Kåre Lindström
    • 1
  1. 1.Institute of LimnologyUppsala 1Sweden

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