Pigments, light penetration, and photosynthetic activity in the multi-layered microbial mats of Great Sippewissett Salt Marsh, Massachusetts

Pierson, B

doi:10.1016/0378-1097(87)90022-x

Cited by 33 publications

(47 citation statements)

References 8 publications

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“…The concentration of bacteriochlorophyll a determined for the purple aggregates in Great Sippewissett Salt Marsh is similar to the concentrations reported for multi-layered microbial mats at the same location [2], for microbial mats on the island of Texel [22] and for sulfureta on the Orkney Islands [3]. Compared to the pigment concentrations in the surrounding pool sediment, bacteriochlorophyll a is significantly enriched (factor of > 17) while chlorophyll a concentrations are only slightly increased (factor of 1.4) in the aggregates.…”

Section: Ecologzcal Imphcattonssupporting

confidence: 77%

“…But the decrease of apparent respiration rates of untreated aggregates in the light has to be attributed, at least partly, to oxygen evolution by diatoms and other oxygenic phototrophs present in the aggregates. Such oxygenic photosynthesis is inhibited in the presence of 5-10 ~M DCMU [2,19]. As light inhibition of respiration was observed even at much higher DCMU concentrations the respiration of Chromatiaceae must be significant in the purple aggregates.…”

Section: Physiology Of Bacterta M the Aggregatesmentioning

confidence: 95%

“…Revsbech et al [12] demonstrated that vertical oxygen profiles can be described by a blnominal equation. Therefore binommal equations of the form 02(x) =a "x2-b'x +c (2) were fitted to our data points where x represents depth m the aggregate and a, b and c are coefficients. Correlation coefficients m most cases were > 0.99.…”

Section: Mwroelectrode Measurementsmentioning

confidence: 99%

“…sediment are termed microbial mats. Where light reaches sulfide-containing layers of stratified sediments, phototrophic sulfur bacteria form dense blooms [1][2][3][4] which extend over only a few millimeters depth. The biomass concentration of phototrophic sulfur bacteria in sediment systems is much higher (max.…”

Section: Introductionmentioning

confidence: 99%

“…20.9 /xgBchl cm -3 [5]). 226 Multi-layered microbial mats in tidal flats of Great Sxppewissett Salt Marsh, Cape Cod, Massachusetts, have been studied extensively [1,2]. In past years densely-packed purple bacterial and green-coloured cyanobacterlal aggregates with dtameters up to 6 mm have been repeatedly observed m pools of the marsh [6] (see Fig.…”

Section: Introductionmentioning

confidence: 99%

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Physiology of purple sulfur bacteria forming macroscopic aggregates in Great Sippewissett Salt Marsh, Massachusetts

Seitz

1993

FEMS Microbiology Ecology

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Purple bactenal aggregates found in tidal pools of Great Sippewissett Salt Marsh (Falmouth, Cape Cod, MA) were mvestlgated m order to eluCidate the ecological significance of cell aggregation. Purple sulfur bactena were the dommant microorganisms m the aggregates which also con tamed diatoms and a high number of small rod-shaped bactena. Urea m concentrations of ~ 1 M caused dlsmtegratlOn of the aggregates while proteolytic enzymes, surfactants or chaotropic agents did not exhibit this effect. This suggests that polysaccharides in the embedding slime matrix stabihze the aggregate structure In addition cell surface hydrophoblclty is involved in aggregate formation. The concentration of dissolved oxygen decreased rapidly below the surface of aggregates while sulfide was not detected. The apparent respiration rate m the aggregates was high when the purple sulfur bactena contamed intracellular sulfur globules. In the presence of DCMU, respiratIOn remained hght-mhibited. Light inhibition disappeared in the presence of KCN. These results demonstrated that respiration m the aggregates IS due mamly to purple sulfur bactena The concentration of bactenochlorophyll (Bch\) a in the aggregates (0.205 mg Bchla cm -3) was much higher than m the pool sedlments but comparable to concentrations in microbial mats of adjacent sand fiats. Purple aggregates may therefore onginate m the microbial mats rather than in the pools themselves Rapid sedimentation and high resplfatlOn rates of Chromatiaceae in the aggregates would prevent the mhibitlon of Bchl syntheSIS If aggregates were hfted off the sediment and up mto the OXIC pool water by tidal currents.

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Section: Ecologzcal Imphcattonssupporting

confidence: 77%

Section: Physiology Of Bacterta M the Aggregatesmentioning

confidence: 95%

Section: Mwroelectrode Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Physiology of purple sulfur bacteria forming macroscopic aggregates in Great Sippewissett Salt Marsh, Massachusetts

Seitz

1993

FEMS Microbiology Ecology

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Linkages between mineralogy, fluid chemistry, and microbial communities within hydrothermal chimneys from the Endeavour Segment, Juan de Fuca Ridge

Lin

Eecke

Breves

et al. 2016

Geochem Geophys Geosyst

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Rock and fluid samples were collected from three hydrothermal chimneys at the Endeavour Segment, Juan de Fuca Ridge to evaluate linkages among mineralogy, fluid chemistry, and microbial community composition within the chimneys. M€ ossbauer, midinfrared thermal emission, and visible-near infrared spectroscopies were utilized for the first time to characterize vent mineralogy, in addition to thinsection petrography, X-ray diffraction, and elemental analyses. A 2828C venting chimney from the Bastille edifice was composed primarily of sulfide minerals such as chalcopyrite, marcasite, and sphalerite. In contrast, samples from a 3008C venting chimney from the Dante edifice and a 3218C venting chimney from the Hot Harold edifice contained a high abundance of the sulfate mineral anhydrite. Geochemical modeling of mixed vent fluids suggested the oxic-anoxic transition zone was above 1008C at all three vents, and that the thermodynamic energy available for autotrophic microbial redox reactions favored aerobic sulfide and methane oxidation. As predicted, microbes within the Dante and Hot Harold chimneys were most closely related to mesophilic and thermophilic aerobes of the Betaproteobacteria and Gammaproteobacteria and sulfide-oxidizing autotrophic Epsilonproteobacteria. However, most of the microbes within the Bastille chimney were most closely related to mesophilic and thermophilic anaerobes of the Deltaproteobacteria, especially sulfate reducers, and anaerobic hyperthermophilic archaea. The predominance of anaerobes in the Bastille chimney indicated that other environmental factors promote anoxic conditions. Possibilities include the maturity or fluid flow characteristics of the chimney, abiotic Fe 21 and S 22 oxidation in the vent fluids, or O 2 depletion by aerobic respiration on the chimney outer wall.

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Cyanobacterial Responses to UV-Radiation

Castenholz

García-Pichel

The Ecology of Cyanobacteria

120

165

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Pigments, light penetration, and photosynthetic activity in the multi-layered microbial mats of Great Sippewissett Salt Marsh, Massachusetts

Cited by 33 publications

References 8 publications

Physiology of purple sulfur bacteria forming macroscopic aggregates in Great Sippewissett Salt Marsh, Massachusetts

Physiology of purple sulfur bacteria forming macroscopic aggregates in Great Sippewissett Salt Marsh, Massachusetts

Linkages between mineralogy, fluid chemistry, and microbial communities within hydrothermal chimneys from the Endeavour Segment, Juan de Fuca Ridge

Cyanobacterial Responses to UV-Radiation

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