Bacterivory of metazooplankton, ciliates and flagellates in a newly flooded reservoir

Thouvenot, Antoine

doi:10.1093/plankt/21.9.1659

Cited by 58 publications

(57 citation statements)

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“…Thus, we suggest revising the concept of pelagic ciliate bacterivory suggested by Fenchel (1980), since recent data have shown that not specialized bacterivorous ciliates, but small, omnivorous oligotrichs are the major ciliate bacterivores in meso-and eutrophic waters (Š imek et al 1995, Stabell 1996, Hwang & Heath 1997a, Thouvenot et al 1999Figs. 1 to 4).…”

Section: Discussionmentioning

confidence: 91%

“…However, there is increasing evidence that ciliates can also significantly contribute to total protistan bacterivory (e.g., Sherr & Sherr 1987, Š imek et al 1995, 1998a. Studies of taxonspecific bacterivory have shown that among pelagic ciliates the most important consumers of bacterioplankton production in both marine and freshwaters are often small oligotrichs (Sherr & Sherr 1987, Sanders et al 1989, Š imek et al 1995, Stabell 1996, Hwang & Heath 1997a, Thouvenot et al 1999, rather than bacterivorous species such as scuticociliates, which usually require bacterial concentrations higher than those found in most pelagic environments (e.g., Fenchel 1980). Such high bacterial abundances are found in hypertrophic systems which can support large populations of scuticociliates (mostly of the genera Cyclidium and Uronema, e.g., Nakano et al 1998) or in specific environments, such as the chemocline, oxycline, etc.…”

Section: Introductionmentioning

confidence: 99%

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Ecological role and bacterial grazing of Halteria spp.: small freshwater oligotrichs as dominant pelagic ciliate bacterivores

Šimek¹,

Jürgens²,

Nedoma³

et al. 2000

Aquat. Microb. Ecol.

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ABSTRACT:We conducted extensive studies on bacterivory and bacterial production over several seasons in 2 reservoirs: the meso-eutrophic Ř ímov Reservoir in the Czech Republic and the highly eutrophic Sau Reservoir in Spain. Based on abundance, seasonal dynamics, and cell-specific uptake rates of different ciliate taxa, as well as heterotrophic nanoflagellate bacterivory, we were able to quantify bacterivory by individual ciliate species, total ciliates, and aggregated protists in these systems. With increasing trophic status, a higher portion of bacterial production was consumed by protists, and there was a greater importance of ciliate grazing, accounting for 40 and 50% of the total protistan bacterivory in the epilimnion of the Ř ímov and Sau reservoirs, respectively. Increases were attributable to the oligotrichs of the genus Halteria that often numerically dominate freshwater pelagic ciliate communities. In both reservoirs, the most important ciliate bacterivores in order of importance were: oligotrichs, primarily the bacterivorous Halteria spp., peritrichs, and scuticociliates. We also examined food vacuole content in natural populations of Halteria spp. to estimate the proportion of cells that had ingested algae. Our results and a review of previous reports on the abundance of Halteria spp. suggest that small halteriids are ecologically important bacterial consumers in meso-to eutrophic freshwater systems due to: (1) efficient uptake of prey over a large size spectrum (approximately 0.4 to 5 µm), (2) high clearance rates on picoplankton-sized particles along with (3) high potential growth rate, and (4) lower vulnerability to metazooplankton predation compared to other common pelagic ciliates. Correspondingly, we suggest a revised concept of planktonic ciliate bacterivory, where the principal role is attributed to small omnivorous filter-feeding oligotrichous ciliates.

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Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Ecological role and bacterial grazing of Halteria spp.: small freshwater oligotrichs as dominant pelagic ciliate bacterivores

Šimek¹,

Jürgens²,

Nedoma³

et al. 2000

Aquat. Microb. Ecol.

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“…Pace 1982;Macek et al 1996;Weisse & Müller 1998;Kalinowska 2000Kalinowska , 2004Mieczan 2007). In both freshwater and marine ecosystems significant vertical gradients of protozoan diversity exist, these apparently being influenced by the distribution of their prey, and physical and chemical variables (Ventelä et al 1998, Thouvenot et al 1999, Jacquet et al 2005. Several investigators suggest that ciliate abundance and biomass reach maximum values in the epi-and metalimnion, with the lowest in the hypolimnion.…”

Section: Introductionmentioning

confidence: 99%

Diversity and vertical distribution of planktonic ciliates in a stratified mesotrophic lake: relationship to environmental conditions

Mieczan¹

2008

Oceanological and Hydrobiological Studies

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The density and biomass of planktonic ciliates significantly differed between sample sites in a deep, mesotrophic lake, with the lowest numbers in the hypolimnion and the highest in the epilimnion. The community composition varied greatly with depth. Oligotrichs dominated in the epilimnion, where prostomatids and peritrichs were also important components of the community. The density of oligotrichs and peritrichs decreased in the metalimnion, and they were absent from the hypolimnion. In the deep metalimnion the most abundant groups were prostomatids, haptorids and scuticociliates. In the hypolimnion, the ciliate community was dominated by scuticociliates and heterotrichs. In the epilimnion and metalimnion a significant positive correlation was observed between ciliate numbers, chlorophyll a and heterotrophic flagellate density. In all three zones the number of ciliates was most strongly correlated with water temperature, concentrations of total organic carbon (TOC), total phosphorus (P tot ) and bacterial density, whilst in the hypolimnion there was a significant correlation between ciliate numbers and the dissolved oxygen concentration.1

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“…Because that species have bacterivore activity and are phytophagous [43,44]. The presence of the bacteria was confirmed by the appearance of the species of sididae diaphonosoma brachyrum [43], this at the end of the spring 2011 at the beginning of the winter and the summer.…”

Section: Resultsmentioning

confidence: 93%

“…Several researchers [10,43,44] determined the quality of several lakes by basing on the presence of some cladocerans (exp. daphniidae, bosminidae, sididae, chydoridae, llyocryptidae) known by their bacterivore activity, phytophagous and détritivores.…”

Section: Resultsmentioning

confidence: 99%

Assessment of Pollution in Sidi M'Hamed Benali Lake (Algeria) Based on Bioindicators and Physicochemical Parameters

Badaoui

Amar

Joaquim-Justo

et al. 2015

IJEE

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This study was carried out to investigate the degree, the nature and the origin of pollution in Sidi M'hamed Benali Lake using the physicochemical parameters, saprobic index and cladocerans. For this purpose, water and zooplankton sampling was collected from six sites in lake during five seasons. The average seasonal values of physicochemical parameters showed that the lake undergoes a slight anthropogenic and natural pollution in the dry and wet periods. Presence of certain toxic substances (CN -, Cr, Ni) require us to be more careful in irrigation, bathe and the consumption of fishes of that reservoir. Overall, oligo-mesosaprobic to beta-mesosaprobic rotifers have been prevailing in all five seasons indicating that the water was slightly or moderate polluted. The presence of Bosmina longirostris, Daphnia longispina, Daphnia cuculata, Daphnia ambiga and Sididae diaphonosoma brachyrum indicate bacterial contamination with the intense development of the phytoplankton in the lake, especially in springs and summer. Pearson correlation analysis revealed significant correlation between all of the physicochemical parameters. However, it revealed no significant correlation between zooplanktons occurrence and the majority environmental variables values. In present investigation, the Lake water is relatively little exposed to pollution and does not undergo strong organic pollution.

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Bacterivory of metazooplankton, ciliates and flagellates in a newly flooded reservoir

Cited by 58 publications

References 0 publications

Ecological role and bacterial grazing of Halteria spp.: small freshwater oligotrichs as dominant pelagic ciliate bacterivores

Ecological role and bacterial grazing of Halteria spp.: small freshwater oligotrichs as dominant pelagic ciliate bacterivores

Diversity and vertical distribution of planktonic ciliates in a stratified mesotrophic lake: relationship to environmental conditions

Assessment of Pollution in Sidi M'Hamed Benali Lake (Algeria) Based on Bioindicators and Physicochemical Parameters

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