The Role of Protozoa in the Activated-Sludge Process

Curds, Colin R.

doi:10.1093/icb/13.1.161

Cited by 81 publications

(46 citation statements)

References 6 publications

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“…These micropredators exert substantial top-down control on bacteria in environmental systems and are characterized by a different prey range (Johnke et al, 2014). Predation by protists is the leading contributor to bacterial turnover in aquatic systems (Sherr and Sherr, 2002) and is a key process in engineered systems such as wastewater treatment plants (Curds, 1973). Protists are known to exploit a relatively large spectrum of bacterial species and are, therefore, classified as generalist predators.…”

Section: Introductionmentioning

confidence: 99%

A Generalist Protist Predator Enables Coexistence in Multitrophic Predator-Prey Systems Containing a Phage and the Bacterial Predator Bdellovibrio

et al. 2017

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Complex ecosystems harbor multiple predators and prey species whose direct and indirect interactions are under study. In particular, the combined effects of predator diversity and resource preference on prey removal are not known. To understand the effect of interspecies interactions, combinations of micro-predators-i.e., protists (generalists), predatory bacteria (semi-specialists), and phages (specialists)-and bacterial prey were tracked over a 72-h period in miniature membrane bioreactors. While specialist predators alone drove their preferred prey to extinction, the inclusion of a generalist resulted in uniform losses among prey species. Most importantly, presence of a generalist predator enabled coexistence of all predators and prey. As the generalist predator also negatively affected the other predators, we suggest that resource partitioning between predators and the constant availability of resources for bacterial growth due to protist predation stabilizes the system and keeps its diversity high. The appearance of resistant prey strains and subsequent evolution of specialist predators unable to infect the ancestral prey implies that multitrophic communities are able to persist and stabilize themselves. Interestingly, the appearance of BALOs and phages unable to infect their prey was only observed for the BALO or phage in the absence of additional predators or prey species indicating that competition between predators might influence coevolutionary dynamics.

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Section: Introductionmentioning

confidence: 99%

A Generalist Protist Predator Enables Coexistence in Multitrophic Predator-Prey Systems Containing a Phage and the Bacterial Predator Bdellovibrio

et al. 2017

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“…Protozoa probably make an important contribution to energy flow in a variety of ecosystems (Fenchel, 1967;Curds, 1973;Berk et al, 1977;Finlay 1978;Porter et al, 1979). Nevertheless, data facilitating the conversion of units of biomass (e, g. dry weight, carbon) to units of energy (heats of combustion, expressed as Joules or calories) are few and scattered in the literature.…”

Section: Introductionmentioning

confidence: 99%

Calorific and carbon values of marine and freshwater Protozoa

Finlay

Uhlig

1981

Helgolander Meeresunters

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Calorific and carbon values were determined for a variety of marine and freshwater Protozoa (Noctiluca miliaris, Euplotes sp., Eufolliculina sp. respectively Tetrahymena pyrfformis, Paramecium caudatum), their food sources (Bacteria, Dunalietla primolecta, Ceratium hirundinella), and for Protozoa-dominated plankton samples. Most calorific values lie close to the centre of the range covering organisms in general. Low values in some marine samples probably resulted from the retention of bound water in the dried material. When all results were combined with data selected from the literature, the dependence of calorific value on carbon content was highly significant. This relationship is probably also adequately described by an energy-carbon regression through the variety of organic compounds commonly found in organisms. Calorific value expressed per unit carbon is shown to vary little in Protozoa (mean conversion factor 46 J [mg C] -1) or throughout the range of biological materials considered in this study (45 J [rag C]-1).

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“…Among organisms listed, the highest level of abundances is achieved by protozoa, at the same time; they remain the required component of the activated sludge biocoenosis [5][6][7][8]. Protozoa is of a primary importance through the all stages of sewage treatment, starting from process of activated sludge flocks forming [8][9][10][11][12]. As bacteria consumer, protozoa participates in processes of organic matters destruction and at the same time stimulates the growth of bacterial populations, supporting their biochemical activity [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Community Composition and Abundance of Protozoa Under Different Concentration Of Nitrogen Compounds at “Hajdow” Wastewater Treatment Plant / Zbiorowiska Pierwotniaków I Ich Liczebność W Oczyszczalni Ścieków „Hajdów” Przy Różnych Stężeniach Związków Azotu

Jaromin-Gleń¹,

Babko²,

Łagód³

et al. 2013

Ecological Chemistry and Engineering S

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Abstract:The protists notably ciliates and testate amoebas in the conditions of modernized wastewater treatment plants "Hajdow" (Lublin, Poland) and the nitrogen removal efficiency were studied. Sampling took place every week during the period of August-September 2010. The total of 31 taxa of ciliates and 3 taxa of testate amoebas were identified. Most of the species were registered during the whole research period. Significant abundance reached the following species: Acineria uncinata, Aspidisca cicada, Aspidisca lynceus, Vorticella aquadulcis, Vorticella infusionum, Arcella vulgaris, Euglypha acanthophora and Pyxidicula operculata. In September increase in efficiency of nitrogen removal process was registered. The research shows that the increase of nitrogen reduction efficiency was accompanied by increase of ciliates quantity, mainly due to peritrichid ciliates.

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The Role of Protozoa in the Activated-Sludge Process

Cited by 81 publications

References 6 publications

A Generalist Protist Predator Enables Coexistence in Multitrophic Predator-Prey Systems Containing a Phage and the Bacterial Predator Bdellovibrio

A Generalist Protist Predator Enables Coexistence in Multitrophic Predator-Prey Systems Containing a Phage and the Bacterial Predator Bdellovibrio

Calorific and carbon values of marine and freshwater Protozoa

Community Composition and Abundance of Protozoa Under Different Concentration Of Nitrogen Compounds at “Hajdow” Wastewater Treatment Plant / Zbiorowiska Pierwotniaków I Ich Liczebność W Oczyszczalni Ścieków „Hajdów” Przy Różnych Stężeniach Związków Azotu

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