, Volume 78, Issue 4, pp 473–476

Occurrence of bacterivory in Cryptomonas, a common freshwater phytoplankter

  • Lars J. Tranvik
  • Karen G. Porter
  • John McN. Sieburth
Original Papers

DOI: 10.1007/BF00378736

Cite this article as:
Tranvik, L.J., Porter, K.G. & Sieburth, J.M. Oecologia (1989) 78: 473. doi:10.1007/BF00378736


Bacterivory was detected by incorporation of 0.57 μm diameter, fluorescent polystyrene beads and fluorescently labeled bacteria (FLB) in two cultured species of Cryptomonas (C. ovata and C. erosa), and a population of Cryptomonas sp in a humic, mesotrophic lake. Rates of ingestion and clearance were very low, and similar for the cultures and the in situ population. The in situ population incorporated 0.7–1.7 bacteria cell-1 h-1, thereby ingesting 0.3%–2.0% of the total bacterial numbers present in the water per day, and receiving less than 2% of its carbon content per day through bacterivory. Thus, bacterivory by Cryptomonas was quantitatively important neither as a sink for bacterial biomass, nor as a carbon source for the algal cells. Possibly, it served in the uptake of essential nutrients.

Key words


Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Lars J. Tranvik
    • 1
  • Karen G. Porter
    • 2
  • John McN. Sieburth
    • 3
  1. 1.Institute of Ecology, LimnologyUniversity of LundLundSweden
  2. 2.Zoology DepartmentUniversity of GeorgiaAthensUSA
  3. 3.Graduate School of OceanographyUniversity of Rhode IslandNarragansettUSA