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Ciliates are the Dominant Grazers on Pico- and Nanoplankton in a Shallow, Naturally Highly Eutrophic Lake

descriptionPublicationkeyboard_double_arrow_right Article , Journal 22 Dec 2006Publisher:Springer Science and Business Media LLCJournal:Microbial Ecology, volume 53, pages 134-142 (issn: 0095-3628, eissn: 1432-184X,

Authors: Tiina Nõges; Priit Zingel; Helen Agasild; Veljo Kisand; Veljo Kisand;

doi: 10.1007/s00248-006-9155-4

pmid: 17186145

Ciliates are the Dominant Grazers on Pico- and Nanoplankton in a Shallow, Naturally Highly Eutrophic Lake

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Abstract

Abundance and biomass of the microbial loop members [bacteria, heterotrophic nanoflagellates (HNF), and ciliates] were seasonally measured in the naturally eutrophic and shallow (2.8 mean depth) Lake Võrtsjärv, which has a large open surface area (average 270 km2) and highly turbid water (Secchi depth <1 m). Grazing rates (filter feeding rates) on 0.5-, 3-, and 6-microm-diameter particles were measured to estimate pico- and nanoplankton grazing (filter feeding) by micro- and metazooplankton. Among grazers, HNF had a low abundance (<50 cells mL-1) and, due to their low specific filtering rates, they only grazed a minor fraction of the bacterioplankton (

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