Nitrogen limitation of growth and gas vacuolation in <i>Oscillatoria rubescens</i>

Klemer, Andrew R.

doi:10.1080/03680770.1977.11896866

Cited by 16 publications

(22 citation statements)

References 8 publications

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“…The model for buoyancy regulation proposed by Dinsdale & Walsby (1972) suggested that nutrient concentration would affect cell turgor and several observations have supported this idea (Meffert, t971 ;Walsby & Klemer, 1974, Klemer, 1976Klemer, 1978). The turgor pressure should rise onlyifthe rates of photosynthetic carbon fixation and energy production exceed the rate at which they are used in macromolecular synthesis.…”

Section: Resultsmentioning

confidence: 93%

“…Filaments which sank from the top of the layer of O. rubescens should be capable of resynthesizing new gas vesicles to prevent further sinking. Klemer (1978) found that O. rubescens could synthesize gas vesicles in the dark within 24 h. The sinking velocity of non-vacuolate O. aghardii Gomont, which is similar in size to O. rubescens, was reported to be 0.8 m day -1. Thus, several days would be required for a sinking filament to cross the layer; apparently the filaments can attain neutral buoyancy before sinking into the hypolimnion.…”

Section: Resultsmentioning

confidence: 96%

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Buoyancy regulation and vertical migration byOscillatoria rubescensin Crooked Lake, Indiana

Konopka

1982

British Phycological Journal

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 96%

Buoyancy regulation and vertical migration byOscillatoria rubescensin Crooked Lake, Indiana

Konopka

1982

British Phycological Journal

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“…The mechanism of buoyancy regulation is interlocked with photosynthetic production (Oliver, 1994;Walsby, 1994); as long as the water column remains thermally stratified, the mechanism should maintain the organism above its compensation depth but prevent it from straying into depths where photosynthesis is strongly light-saturated or inhibited. Studies with several planktonic cyanobacteria indicate that the irradiance required for buoyancy loss is lower when nutrients are limiting (Klemer, 1978;Klemer, Feuillade and Feuillade, 1982;Konopka, Kromkamp and Mur, 1987). This may explain why P. rubescens in Lake Zürich positions itself so far down the vertical light gradient.…”

Section: Discussionmentioning

confidence: 90%

The effects of diel changes in photosynthetic coefficients and depth of Planktothrix rubescens on the daily integral of photosynthesis in Lake Zürich

et al. 2001

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In late summer and autumn, before the vertical circulation reaches the thermocline, the phytoplankton population of Lake Zürich is dominated by the red-coloured filamentous cyanobacterium Planktothrix rubescens, which stratifies in the metalimnion at depths close to the photosynthetic compensation point. The filament volume concentration reached a maximum of 12 cm 3 m -3 ; the depth of the maximum varied from 10.5 to 12.5 m. Changes in the depth distribution were attributed to a combination of (1) seiche movements, which raised or lowered the thermocline by up to 2 m over 36 h, and (2) flotation by the buoyant filaments relative to the isotherms, by up 0.4 m d -1 . These changes caused a 2-fold change in insolation at the Planktothrix peak. Estimates were made of the daily integral of photosynthetic O 2 -production, SS(NP), by the population of P. rubescens over a period of four cloudless days. The estimates were calculated from measurements of surface irradiance (at 5-min intervals), vertical light attenuation, temperature, filament volume concentration and the photosynthesis/irradiance (P/I) curves of filaments concentrated from the metalimnion. Despite the similar, high insolation on each of the four days, the calculated values of SS(NP) varied from 9 to 53 mmol m -2 d -1 , owing to the changing depth distribution of the filaments. Measurements of P/I curves of lakewater samples incubated at a depth of 11 m showed changes in the photosynthetic coefficients during the day. These also generated large changes in calculated values of SS(NP). The computer spreadsheet used to calculate SS(NP) was modified to incorporate timebased changes in the photosynthetic coefficients and vertical distribution of the organism. These refinements provide a more accurate description of photosynthesis by the deep-living P. rubescens, which adjusts its position by buoyancy regulation to exploit the light field in the metalimnion, where it outcompetes other phytoplankton.

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“…Light can do this, at least in nutrient-sufficient algae. With a reduction in light intensity, RGV increased in batch cultures of A. flosaquae (4, 5), but not in Oscillatoria rubescens taken from a N-limiting chemostat (6). As alternatives to light, Reynolds and Walsby (7) suggested the major growth-limiting nutrients: C, N, and P. We report that RGV in 0. rubescens decreased with increases in the degree of N limitation and increased with transitions to inorganic carbon (C1) limitation.…”

mentioning

confidence: 71%

“…171, 9 (1962); F. Heyman, Nature (London) 216, 402 (1967). 6 Blue-green algae (Cyanobacteria) can form dense surface and deepwater population maxima in lakes because their cells possess gas vacuoles. Gas vacuoles are aggregates of vesicles with gas-permeable, proteinaceous walls.…”

mentioning

confidence: 99%

Cyanobacterial Blooms: Carbon and Nitrogen Limitation Have Opposite Effects on the Buoyancy of Oscillatoria

Klemer

Feuillade²,

Feuillade³

1982

Science

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102

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Gas vacuolation in Oscillatoria rubescens decreased with increased nitrogen limitation and increased with transitions from nitrogen to inorganic carbon limitation. Gas vacuoles consist of protein vesicles that can accumulate in carbon- limited but not in unenriched nitrogen-limited cells. Nitrogen limitation is a factor in the formation of deep population maxima; carbon limitation can promote surface blooms.

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Nitrogen limitation of growth and gas vacuolation in Oscillatoria rubescens

Cited by 16 publications

References 8 publications

Buoyancy regulation and vertical migration byOscillatoria rubescensin Crooked Lake, Indiana

Buoyancy regulation and vertical migration byOscillatoria rubescensin Crooked Lake, Indiana

The effects of diel changes in photosynthetic coefficients and depth of Planktothrix rubescens on the daily integral of photosynthesis in Lake Zürich

Cyanobacterial Blooms: Carbon and Nitrogen Limitation Have Opposite Effects on the Buoyancy of Oscillatoria

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