Nutritional mode of several non-pigmented microflagellates from the York River estuary, Virginia

Haas, Leonard W.; Webb, Katie

doi:10.1016/0022-0981(79)90009-1

Cited by 109 publications

(73 citation statements)

References 31 publications

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“…We chose to add P to our bottles, because it limits phytoplanktonic growth in Lake Michigan (Schelske et al 1986). TO explore the possibility that macrozooplankton might be supplying protozoa with organic compounds which could enhance growth by either direct uptake (Haas and Webb 1979) or by augmenting bacterial prey densities (Taylor and Lean 198 l), we added glucose (0.09 PM final concn) to one 0 X and one 1 x bottle on several dates (13 June, 10 July, 28 August, and 4 October).…”

Section: Methodsmentioning

confidence: 99%

The importance of zooplankton‐protozoan trophic couplings in Lake Michigan

Carrick

Fahnenstiel

Stoermer

et al. 1991

Limnology & Oceanography

137

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The importance of the zooplankton-protozoan trophic coupling was determined experimentally by measured changes in protozoan growth rates with increasing zooplankton biomass. In five of six experiments conducted in Lake Michigan, a significant inverse relationship between protozoan growth and zooplankton biomass was observed (avg r2 = 70%), Zooplankton clearance rates on protozoan assemblages (range, 1.0-6.2 ml (pg dry wt)-I d '1 were comparable to those previously measured for phytoplankton which suggested that protozoa are important prey for zooplankton. Clearance rates on individual protozoan taxa [O-15.6 ml (Fg dry wt)-I d-l] were size-dependent. Rates were greatest for taxa ~20 grn in size (mainly nanoflagellates and small ciliates). In contrast to findings for phytoplankton, no evidence emerged for grazer resistance nor growth enhancement by planktonic protozoa in response to grazing. The high flux rates for macrozooplankton on heterotrophic nanoflagellates observed in all experiments (0.2-6.0 pg C liter-' d-l) provided evidence that a large fraction of picoplankton C may be directly transferred to higher trophic levels via a picoplankton-flagellate-zooplankton coupling.

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Section: Methodsmentioning

confidence: 99%

The importance of zooplankton‐protozoan trophic couplings in Lake Michigan

Carrick

Fahnenstiel

Stoermer

et al. 1991

Limnology & Oceanography

137

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“…Several investigators have stressed the importance of microprotozoan predation for control of bacterial numbers (e.g. Haas and Webb 1979;Sieburth 1979;Sieburth and Davis 1982;Sorokin 198 1). Fenchel(l9823) and Sherr et al (1983) quantified clearance and other bioenergetic parameters for several species of zooflagellates in laboratory cultures.…”

Section: Bacterivory By Microheterotrophic Flagellates In Seawater Samentioning

confidence: 99%

Bacterivory by microheterotrophic flagellates in seawater samples

Andersen

Fenchel

1985

Limnology & Oceanography

168

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Changes in the population sizes of bacteria and of heterotrophic microflagellates in seawater during the first 30–60 h after sampling indicate that these protozoa control bacterial numbers in situ. The observations allow crude estimates of in situ grazing rates and of the minimum bacterial concentration which sustains protozoan growth. In the water samples studied, an average flagellate will clear 1–2 × 10−5 ml h−1 (15°C). If this result is extrapolated to other areas, typical concentrations of microflagellates in the sea suggest that between 5 and 250% of the water column is cleared of bacteria per day. Bacterial numbers above about 106 ml−1 will sustain flagellate growth.

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“…Using the ratio of 0.93 weight % S in protein, the con- (Haas and Webb, 1979). Thus both a source and an effective sink exists for large-scale particulate flux into the food web which has previously been ignored.…”

Section: Trientmentioning

confidence: 99%

Assimilatory sulfur metabolism in marine microorganisms

Cuhel¹

1980

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Nutritional mode of several non-pigmented microflagellates from the York River estuary, Virginia

Cited by 109 publications

References 31 publications

The importance of zooplankton‐protozoan trophic couplings in Lake Michigan

The importance of zooplankton‐protozoan trophic couplings in Lake Michigan

Bacterivory by microheterotrophic flagellates in seawater samples

Assimilatory sulfur metabolism in marine microorganisms

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