A Study of Feeding Responses to Bacterial Prey by Estuarine Ciliates

Berk, Sharon G.; Colwell, Rita R.; Small, Eugene B.

doi:10.2307/3225146

Cited by 50 publications

(33 citation statements)

References 15 publications

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“…Berk et al 1976), although the first days' clearance on Vibn o cholerae and Salmonella typhi were on average 40 and 50 nl cell-' h-', respectively (differences were not significant). The clearance measured on the third day -I aLir 2.…”

Section: Ciliate Feeding Upon Vibrio Choleraementioning

confidence: 99%

“…by Berk et al (1976), although they used higher bacterial concentrations. In other experiments, maximum grazing rates (Table 3) reached over 2000 bacteria cell-' h-', showing C, glaucoma as a more efficient feeder under these bacterial concentrations (see Fenchel 1986).…”

Section: Ciliate Feeding Upon Vibrio Choleraementioning

confidence: 99%

“…Vibrio cholerae as a common saline water bacterium could serve as a source of food for planktonic bacterivorous organisms, particularly for ciliates and flagellates (compare Berk et al 1976with Porter et al 1985, Sherr et al 1986, Beaver & Crisman 1989, and thus enter a 'microbial loop' (Pomeroy 1974, Azam et al 1983) within the plankton food web. However, many pathogenic bacteria are known as toxic to ciliates, or as not being able to meet all their carbon requirements.…”

Section: Introductionmentioning

confidence: 99%

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Ciliate-Vibrio cholerae interactions within a microbial loop: an experimental study

Macek¹,

Carlos²,

Memije³

et al. 1997

Aquat. Microb. Ecol.

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ABSTRACT-Interactions between Vibrio cholerae and 2 Mexican athalassohaline-lake bacteria asseinblages were studied in laboratory microcosms with the presence or absence of protists. Pre-cultivated and harvested vibrios were added as the food for protists at a concentration of 107cells ml-' Total direct bacterial counts, colony forming units on a selective (thiosulphate-citrate-bile salts-sucrose) medium, and V. cholerae indirect fluorescent antibody (FA) direct counts were measured. Numbers of V. cholerae decreased faster in the microcosms inoculated with protists and, moreover, the proportion of non-culturable vibrio counts increased. Comparison between the ciliate feeding rates upon fluorescently labelled V. cholerae, Salmonella typhi and Shigella sp. showed that the ciliates fed preferably upon vibrios. Calculated grazing rates of Cyclidium glaucoma related to non-culturable but FA-positive V. cholerae were correlated to observed decrease in V cholerae numbers.

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Section: Ciliate Feeding Upon Vibrio Choleraementioning

confidence: 99%

Section: Ciliate Feeding Upon Vibrio Choleraementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ciliate-Vibrio cholerae interactions within a microbial loop: an experimental study

Macek¹,

Carlos²,

Memije³

et al. 1997

Aquat. Microb. Ecol.

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“…The bacteria wLl support the growth of bacterivorous flagellates (Sherr et al 1983, Newell & Lnley 1984, Sieburth 1984, Sherr et al 1986a, and cdiates (Berk et al 1976, Gast & Horstmann 1983, Lessard & Swift 1985, Rivier et al 1985, Sherr et al 1986b. Grazing on the bacterial population may continue until the concentration of bacteria decrease below some threshold value where grazing becomes energetically unfavorable.…”

Section: Introductionmentioning

confidence: 99%

Carbon flow in an experimental microbial ecosystem

Bratbak¹

1987

Mar. Ecol. Prog. Ser.

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The significance of the 'microbial loop' as an integral part of the marine food web is currently being discussed. We have used batch cultures to model a phytoplankton bloom and investigated carbon flow from the dlatom Skeletonema costatum to bacterivorous nanoflagellates, via extracellular organic carbon (EOC) and bacteria. In the exponential growth phase, the algae did not release significant amounts of EOC (measured as amino acids and carbohydrates). After the exponential growth phase the algae released an amount of EOC that in terms of carbon equalled the amount of algal carbon biomass produced during the exponential growth phase. Although death of the algal population was related to bacterial activity, algal death did not seem to increase the amount of organic carbon available for bacterial growth. The main function of the bacteria was to convert EOC into particulate organic carbon (POC) and thereby increase the amount of POC available for bactenvores. But, as they also tied up inorganic nutrients, the bacteria prevented further growth of the algae. The main function of the bacterivorous flagellates was to remineralize both organic carbon and inorganic nutrients hed up in bacterial biomass.

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“…Nanoplanktonic ciliates may play a role in this microbial food web. Since ciliates are a known food for copepods and other metazooplankton (Berk et al 1977;Porter et al 1979;Robertson 1983), the presence of nanoplanktonic ciliates in the sea may represent a direct link in the marine food web between procaryotic microbes and metazoans.…”

mentioning

confidence: 99%