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JOURNAL OF PLANKTON RESEARCH | VOLUME 12 | NUMBER 1 | PAGES 185-199 | 1990
© Oxford University Press

research-article

The effect of detrital addition on the development of nanoflagellates and bacteria in Lake Kinneret

O. Hadas, R. Pinkas, C. Albert-Diez1, J. Bloem1, T. Cappenberg1 and T. Berman

Kinneret Limnological Laboratory PO Box 345, Tiberias, Israel 14102 1Vijverhof Laboratorium Rijksstraatweg 6, 3621 AC Nieuwersluis, The Netherlands

Received on April 3, 1989; accepted on October 11, 1989 The effect of adding dissolved substrates derived from algal cells on the patterns of nutrient cycling and growth of bacteria, heterotrophic nanoflagellates (HNAN) and photoautotrophs was determined in samples of near-surface waters from Lake Kinneret. Supplementation of substrates always resulted in an increased peak of HNAN numbers and had little effect on bacterial numbers. HNAN-mediated nutrient remineralization of nitrogen and phosphorus was also stimulated. In light-incubated samples the remineralized nutrients were taken up by photoautotrophic cells. Maximum growth rates observed for HNAN ranged from 0.03 to 0.11 h–1, clearance rates for bacteria 1.1–7.3 nl HNAN–1 h–1 and remineralization rates 6.4–8.4 µg N mg dry wt–1 h–1 and 0.37–0.99 µg P mg dry wt–1 h–1.


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