Dominance of ciliate grazing on bacteria during spring in a shallow eutrophic lake

Kisand, Veljo; Zingel, Priit

doi:10.3354/ame022135

Cited by 56 publications

(38 citation statements)

References 33 publications

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“…It is now commonly accepted that nanoflagellates are the most important grazers of bacteria in most aquatic environments (Epstein & Shiaris 1992, Nakano et al 1998, Safi & Hall 1999, Sanders et al 2000, Tsai et al 2005, Ichinotsuka et al 2006, though some planktonic ciliates also can be significant consumers of bacteria (Rassoulzadegan et al 1988, Jürgens & 2imek 2000, Kisand & Zingel 2000. On an individual basis, a bacterivorous ciliate may graze an order of magnitude more bacterial cells than a nanoflagellate (2imek & Stra$krabová 1992, James et al 1996, Ichinotsuka et al 2006).…”

Section: Discussionmentioning

confidence: 99%

Importance of bacterivory by pigmented and heterotrophic nanoflagellates during the warm season in a subtropical western Pacific coastal ecosystem

Tsai¹,

Gong²,

Sanders³

et al. 2011

Aquat. Microb. Ecol.

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We investigated temporal variations in the effects of bacterivory by different sizes of heterotrophic nanoflagellates (HNF) and pigmented nanoflagellates (PNF) during a warm period (May to September) in oligotrophic coastal waters of the subtropical western Pacific. Short-term experiments with fluorescently labeled bacteria (FLB) demonstrated ingestion rates of 0.3 to 5.8 bacteria HNF -1 h -1 by HNF in the size range 3-6 µm -rates that were higher than observed for other sizes of HNF. Rates of ingestion by PNF ranged between 0.9 and 15.5 cells PNF -1 h -1, and, as for HNF, were greatest for PNF in the 3-6 µm size group. Nanoflagellates of size < 6 µm removed about 98% of the total amount of bacteria consumed. The 3-6 µm PNF, 2-3 µm HNF, and 3-6 µm HNF were major consumers in the nanoflagellate community and were responsible for an average of 52, 28 and 16% of the total consumption of bacteria, respectively. The smallest PNF (2-3 µm) consumed only about 2% of the total and were considered to be primarily autotrophic. Despite ingestion rates in the range of those reported elsewhere, the low abundance of nanoflagellates observed resulted in relatively low grazing impacts (<10% of bacterial standing stock). We found a significant negative correlation between PO 4 concentrations and ingestion rates of the 3-6 µm PNF, suggesting that the PNF ingestion rate increased under nutrient-deficient conditions.

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Section: Discussionmentioning

confidence: 99%

Importance of bacterivory by pigmented and heterotrophic nanoflagellates during the warm season in a subtropical western Pacific coastal ecosystem

Tsai¹,

Gong²,

Sanders³

et al. 2011

Aquat. Microb. Ecol.

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“…Under oligotrophic conditions, inorganic nutrients may limit bacterial growth [7] . Heterotrophic nanoflagellates are often the dominant grazers on bacteria in aquatic ecosystems [29] , but specially in eutrophic environments, ciliates can be an important grazers too [19] . In this study, it has been noticed that pollution affected species diversity of zooplankton, the number of species in both influent and facultative pond was 10 and 8 species because of high pollution level, whereas in maturation pond increased to 21 species, due to the presence of low pollution levels.…”

Section: Discussionmentioning

confidence: 99%

Performance Evaluation of a Waste Stabilization Pond in a Rural Area in Egypt

Ghazy¹,

Senousy²,

Aatty³

et al. 2008

American J. of Environmental Sciences

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Abstract:The performance evaluation of the waste stabilization pond (WSP) as a model of domestic wastewater treatment unit in rural area was carried out. The unit comprised of anaerobic, facultative and maturation ponds in two series. The effluents of WSP which are discharged in the drain had the BOD reduced to 109-245 mg L , 44.3% removal). The reduction percentages of total coliform (TC), faecal coliform (FC), E.coli, faecal streptococci (FS), salmonellae and Listeria were 98.8, 95.6, 79.4, 96.8, 97.9 and 89.5% respectively. Also, the removal percentages of coliphage and infectious rotaviruses were 49.03 and 99.66% respectively. Identical sequences of rotaviruses VP-6 detected in the final effluent of the pond and the drain were observed. Euglena variables and Chlamydomonas reinhardii were predominant in anaerobic, facultative and maturation effluents. It has been noticed that pollution affected species diversity of zooplankton; the number of species in facultative pond was 8 species because of high pollution level, whereas in maturation pond increased to 21 species. Also, pollution in anaerobic pond increased density of ciliates (Protozoa) which are known to be bio-indicators of organic pollution. The percent removal of ciliates in the maturation pond was 70%. It is recommended to make some modifications in the design to increase the efficiency of WSP.

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“…During this spring increase, we observed mainly Oligotrichs, Haptorids, Colpods and some Scuticociliates while Prostomatids constituted a dominant group during the winter period. Oligotrichs were dominant and were mainly represented by Halteria and Strombidium, which are known to be important bacterial consumers in meso-to eutrophic freshwater systems, with a strong grazing impact on a wide prey size spectrum (JURGENS and SIMEK, 2000;KISAND and ZINGEL, 2000;SIMEK et al, 2000).…”

Section: In Situ Microbial Community Dynamicsmentioning

confidence: 99%

Assessing the microbial community dynamics and the role of bacteriophages in bacterial mortality in Lake Geneva

Duhamel¹,

Domaizon²,

Personnic³

et al. 2006

rseau

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SummaryThe aims of this work were to study, for the first time, the succession of microbial communities (from viruses to ciliates) in the largest occidental European lake (Lake Geneva) and to perform two one-weekin situexperiments in March-April (Exp1) and May (Exp2) 2004 in order to assess both small flagellate protozoan and virus-induced mortality of heterotrophic bacteria. Both nanoflagellates and viruses could be responsible for 31 to 42% of the total daily mortality of heterotrophic bacteria. In May (Exp2), viruses could explain up to 10% of the bacterial mortality whereas flagellates were responsible for 32% of the bacterioplankton removal. These results provide new evidence for the critical role played by viruses in the functioning of the microbial food webs and highlight the importance of further considering this biological compartment for a better understanding of the plankton ecology of Lake Geneva.

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Dominance of ciliate grazing on bacteria during spring in a shallow eutrophic lake

Cited by 56 publications

References 33 publications

Importance of bacterivory by pigmented and heterotrophic nanoflagellates during the warm season in a subtropical western Pacific coastal ecosystem

Importance of bacterivory by pigmented and heterotrophic nanoflagellates during the warm season in a subtropical western Pacific coastal ecosystem

Performance Evaluation of a Waste Stabilization Pond in a Rural Area in Egypt

Assessing the microbial community dynamics and the role of bacteriophages in bacterial mortality in Lake Geneva

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