Occurrence of bacterivory in Cryptomonas,a common freshwater phytoplankter |
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Authors: | Lars J Tranvik Karen G Porter John McN Sieburth |
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Institution: | (1) Institute of Ecology, Limnology, University of Lund, Box 65, S-221 00 Lund, Sweden;(2) Zoology Department, University of Georgia, 30602 Athens, GA, USA;(3) Graduate School of Oceanography, University of Rhode Island, Narragansett Bay Campus, 02882 Narragansett, RI, USA |
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Abstract: | Summary Bacterivory was detected by incorporation of 0.57 m 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. |
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Keywords: | Plankton Bacterivory Mixotrophy Phagotrophy Cryptomonas |
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