Photoinaktivierung von Nitrobacter winogradskyi Buch

Müller-Neuglück, Mariegret; Engel, Horst

doi:10.1007/bf00408615

Cited by 36 publications

(10 citation statements)

References 8 publications

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“…Clearly, platelet ice appears to be an ideal habitat for nitrifying bacteria. Nitrifiers are inhibited by high light (Miiller-Nugliick & Engel 1961, Bock 1965, and therefore, most nitrification in the water column occurs near the base of the photic zone [Ward et al 1982). This is consistent with our observation of coincident NO2 and NO3 peaks in the lower platelet ice where light levels were substantlally reduced (Arrigo et al 1993131, implying that nitrification rates were greatest there.…”

Section: Discussionsupporting

confidence: 89%

High resolution study of the platelet ice ecosystem in McMurdo Sound, Antarctica:biomass, nutrient, and production profiles within a dense microalgal bloom

Arrigo¹,

Dieckmann²,

Gosselin³

et al. 1995

Mar. Ecol. Prog. Ser.

101

119

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ABSTRACT-Vertical distributions of inorganic nutrients (nitrate, nitrite, ammonium, phosphate, and silicic acid) and microalgal and bacterial biomass were monitored within both the lower congelation ice and the platelet ice layer in McMurdo Sound, Antarctica from 31 October to 3 December 1989. Profiles of dissolved organic matter (DOM) (amino acids and simple sugars) and heterotrophic protists were also obtained in early December. Microalgal standing crop increased from 9.4 to 37.4 g C m-' during our 34 d study (peak accumulation rate of > l g C m-2 d-'), and maximum pigment concentrations exceeded 6500 mg chl a m-3 near the congelation ice/platelet ice interface. Estimates of seawater exchange within the platelet ice ranged from 0.06 to 0.61 m2 d-' when Si(OH), was used as a tracer. The biochemical composition of the autotrophic community and the presence of high nutrient concentrations within the platelet layer indicated that the growth of platelet ice algae was limited by l~ght, rather than nutrients, throughout the season. NO3 and Si(OH), concentrations in the platelet ice were generally high (30 to 32 and 65 to 82 mm01 m-3, respectively), but became depleted in the uppermost layers as chl a peaked late in November. NH, was far more abundant in the platelet ice (5 to 10 mm01 m-3) than in the underlying water column (0.5 mm01 m-3) throughout the field season. Microbial regeneration was primarily responsible for the high background concentrations of NH, in the platelet ice, although physical processes also may have contributed. A large NH4 pulse (>l50 mm01 m-3) was observed in the platelet layer in early November, possibly attributable to an isolated macrozooplankton grazing and excretion event. PO, concentrations (2.0 mm01 m-3 in the water column) were minimal ( < l . ? mm01 m-3) in the upper platelet ice on November 11, but began to increase thereafter due to PO, regeneration. By early December, concentrations reached their maximum of 3.73 mm01Rates of POq regeneration were highest (peak of 35 mm01 m-3 d-') in the upper layers of the platelet ice where the bulk of the microbial biomass was located. The platelet ice was unusual because, although concentrations of regenerated nutrients were often high, the elemental composition of particulates remained near the Redfield ratios and detrital abundance was low. The coincidence of NO2 and NO, peaks at a depth of 0.65 to 0.75 m suggests that bacterial nitrification may also occur in the platelet ice.

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Section: Discussionsupporting

confidence: 89%

High resolution study of the platelet ice ecosystem in McMurdo Sound, Antarctica:biomass, nutrient, and production profiles within a dense microalgal bloom

Arrigo¹,

Dieckmann²,

Gosselin³

et al. 1995

Mar. Ecol. Prog. Ser.

101

119

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“…The inhibitory effect of light was reported by German researchers in the 1960s (Muller-Neugluck and Engel, 1961;Muller-Nugluck and Engle, 1961;Schon and Engel, 1962 ), verified in enrichment cultures in seawater and later described in more detail (e.g., Vanzella et al, 1989). Even in enrichment cultures of nitrifiers derived from the sea surface film, nitrification was severely inhibited by light, such that periods of more than 12 h darkness were necessary to allow net nitrification to occur over a 24 h period .…”

Section: Lightmentioning

confidence: 88%

Nitrification in Marine Systems

Ward

2008

Nitrogen in the Marine Environment

196

202

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“…MULLER-NEUGLUCK and ENGEL (1) reported that Nitrobacter winogradsky was reversibly inactivated by a relatively low light intensity (4,900 lx) and that illumination for 28 days had not a lethal but a static effect on the growth of N. winogradsky. SCHON and ENGEL (2) suggested that Nitrosomonas europaea cells were killed outright when they were illuminated for a long period with a sufficient intensity of light.…”

Section: Discussionmentioning

confidence: 99%

“…Light has an inhibitory effect on nitrifying bacteria (1,2). OLSON (3,4) and WARD et al (5) suggested that the formation of the primary nitrite maximum in the ocean was due to the differential photoinhibition of nitrifying bacteria.…”

mentioning

confidence: 99%

Photoinhibition and recovery of NH4+-oxidizing bacteria and NO2--oxidizing bacteria.

Yoshioka

Saijo

1984

J. Gen. Appl. Microbiol.

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The effects of illumination on nitrifying bacteria were investigated with and without substrate. NH4+-oxidizing bacteria (strain H-1, probably Nitrosospira sp.) and N02--oxidizing bacteria (strain 0-1, probably Nitrobacter sp.), isolated from Lake Kizaki, were inhibited by light (about 75 ,uEinsteins/m2/sec,12-hr light: 12-hr dark). Photoinhibited H-1 and 0-1 cells recovered after several to tens of days under dark conditions. However, H-1 cells, illuminated for 7 to 10 days in the absence of NH4+, did not produce N02-significantly for 120 to 350 days in a medium containing 50 uM NH4+. The substrate (NH4+) was found to protect H-1 from photoinhibition, while such an effect of N02-on 0-1 was not so clear. 0-1 was more sensitive to light than H-1 in the short illumination period. However, the inhibitory effect of prolonged illumination was greater on H-1 than on 0-1. It was indicated from growth kinetic analysis that the photoinhibitory effects on both NH4+-oxidizing bacteria and N02--oxidizing bacteria were not only lethal but also bacteriostatic. Nitrification, which is an important microbiological process in the nitrogen cycle, is affected by substrate (NH4+ and N02-) concentration, temperature, oxygen content, pH, and Eh. Light has an inhibitory effect on nitrifying bacteria (1, 2). OLSON (3, 4) and WARD et al. (5) suggested that the formation of the primary nitrite maximum in the ocean was due to the differential photoinhibition of nitrifying bacteria. HORRIGAN et al. (6) found that nitrifying bacteria isolated from sea-surface film were inhibited by light and that no nitrification occurred in the surface films of subtropical seas. From the point of view of the recovery from photoinhibition of nitrifying bacteria, HOOFER and TERRY (7) observed that Nitrosomonas europaea cells 90 %-inactivated by illumination recovered their full activity after 10 hr. HORRIGAN et al, (6) cited the fact that light inhibition was not lethal and that nitrifiers might recover when they mixed to depths of sufficiently low light levels in the sea. In Lake Kizaki, the nitrifying activity of lake water is very low in l51

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Photoinaktivierung von Nitrobacter winogradskyi Buch

Cited by 36 publications

References 8 publications

High resolution study of the platelet ice ecosystem in McMurdo Sound, Antarctica:biomass, nutrient, and production profiles within a dense microalgal bloom

High resolution study of the platelet ice ecosystem in McMurdo Sound, Antarctica:biomass, nutrient, and production profiles within a dense microalgal bloom

Nitrification in Marine Systems

Photoinhibition and recovery of NH4+-oxidizing bacteria and NO2--oxidizing bacteria.

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