Photosynthetic bacteria in meromictic lakes and stratified fjords of the Vestfold Hills, Antarctica

Hydrobiologia ◽  
1988 ◽  
Vol 165 (1) ◽  
pp. 13-23 ◽  
Author(s):  
C. M. Burke ◽  
H. R. Burton
Keyword(s):  
Photosynthetic Bacteria ◽  
Meromictic Lakes ◽  
Vestfold Hills

The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica

1999 ◽  
Vol 11 (2) ◽  
pp. 175-192 ◽  
Author(s):  
John A.E. Gibson
Keyword(s):  
Ice Formation ◽  
Convection Cell ◽  
Meromictic Lakes ◽  
Surface Level ◽  
Thermohaline Convection ◽  
Vestfold Hills ◽  
Lower Water Level ◽  
The Stability ◽  
Wind Mixing ◽  
Marine Basins

Thirty-four permanently stratified water bodies were identified in a survey of the Vestfold Hills. Of these, 21 were lakes, six were seasonally isolated marine basins (SIMBs), and seven were marine basins with year round connection to the open ocean. The basins varied markedly in salinity (4 g l−1 to 235 g l−1), temperature (−14°C to 24°C), depth (5 m to 110 m), area (3.6 ha to 146 ha) and surface level (−30 m to 29 m above sea level). The stratification in all the basins was maintained by increases in salinity. During winter, a thermohaline convection cell was present in all lakes and SIMBs directly beneath the ice cover. These cells were the result of brine exclusion from the forming ice, and increased in density throughout winter, penetrating progressively deeper into the lake. Minimum stability, and therefore the maximum likelihood of turnover, occurred at the time of maximum ice formation in spring. At the end of the period of ice formation, the convection cell broke down, and stratification of the surface water occurred. When the ice melted completely, lenses of relatively fresh water capped the lakes, which reduced the effect of wind mixing. Net meltwater input increased the stability of the meromictic basins, while periods of lower water level resulted in deeper penetration of the thermohaline convection cell, increasing the possibility of turnover and destratification.

A Possible Varving Mechanism for Meromictic Lakes

1979 ◽  
Vol 11 (1) ◽  
pp. 113-124 ◽  
Author(s):  
M. D. Dickman
Keyword(s):  
Photosynthetic Bacteria ◽  
Anaerobic Bacteria ◽  
Meromictic Lake ◽  
Meromictic Lakes ◽  
Oxygenated Water ◽  
Annual Sediment

A variety of mechanisms have been proposed to explain how light and dark couplets are formed in the profundal sediments of meromictic lakes but none of these explanations acknowledges the significance of the sudden and massive mortality of mixolimnetic anaerobic bacteria. Data collected from sedimentation chambers suspended below the chemocline in a small meromictic lake indicate that a massive mortality of photosynthetic bacteria was induced by a sudden intrusion of partially oxygenated water into the anaerobic lower mixolimnion. The resulting deposition of anaerobic bacteria (0.45 mg dry wt cm−2 day−1) contributed 60% of the annual sediment influx during a 14-day period. It is postulated that the sudden sedimentation of the anaerobic bacteria inhabiting the lower mixolimnion of some meromictic lakes contributed to the formation of the dark-colored laminae in the sediments of these lakes.

Meromictic lakes of south-west Tasmania

1981 ◽  
Vol 32 (5) ◽  
pp. 741 ◽  
Author(s):  
RD King ◽  
PA Tyler
Keyword(s):  
Photosynthetic Bacteria ◽  
Chlorophyll Concentration ◽  
Meromictic Lakes ◽  
Dissolved Oxygen Concentration ◽  
Power Station ◽  
Sulfur Bacteria ◽  
South West ◽  
Photosynthetic Sulfur Bacteria ◽  
Water Stratum ◽  
Lake Fidler

Lake Fidler, Lake Morrison and Sulphide Pool are three small, shallow lakes adjacent to the lower reaches of the Gordon River. They are levee lakes, and may be remnants of once more extensive water bodies. Eah of them shows the usual features of meromictic lakes, with a persistent chemocline acioss which the concentration of electrolytes and hydrogen sulfide increases sharply, dissolved oxygen concentration falls to zero, and redox potential changes from positive to negative. In all three lakes the change in electrolyte concentrations takes place over a comparatively thick water stratum, but the redoxcline and oxycline are pronounced, and in their vicinity is a 'plate' of microflagellates and photosynthetic sulfur bacteria, marked by sharp peaks in the profiles of chlorophyll concentration and of turbidity. Their waters are dystrophic, severely attenuating light and limiting plankton populations in the mixolimnia. Photosynthetically active radiation at the depth of the plates of photosynthetic bacteria is considerably less than 1% of surface values. With the chemocline in each case so close to the surface (1.0-2.5 m), and with their shallowness, these are among the most dramatic cases of meromixis yet recorded. Their survival is in doubt because operation of a power station now prevents the entry of estuarine salt on which the state of meromixis appears to depend.

Metals Related to Radionuclides and Heavy Metals Removal Using Photosynthetic Bacteria Immobilized Recovery Type Porous Ceramic

2010 ◽  
Vol 46 (3) ◽  
pp. 119-127 ◽  
Author(s):  
KEN SASAKI ◽  
CHIHIRO HARA ◽  
KENJI TAKENO ◽  
HIROSHI OKUHATA ◽  
HITOSHI MIYASAKA
Keyword(s):  
Heavy Metals ◽  
Photosynthetic Bacteria ◽  
Porous Ceramic ◽  
Heavy Metals Removal ◽  
Metals Removal

scholarly journals Isolation of Rhodocyclus gelatinosus from poultry slaughterhouse wastewater

2002 ◽  
Vol 45 (4) ◽  
pp. 445-449 ◽  
Author(s):  
Elisa Helena Giglio Ponsano ◽  
Pedro Magalhães Lacava ◽  
Marcos Franke Pinto
Keyword(s):  
Carbon Source ◽  
Photosynthetic Bacteria ◽  
Synthetic Medium ◽  
Poultry Feed ◽  
Gram Negative ◽  
Slaughterhouse Wastewater ◽  
Rhodocyclus Gelatinosus

Four cultures of photosynthetic bacteria isolated from poultry slaughterhouse wastewater were identified as Rhodocyclus gelatinosus based on the following properties: reddish color of cultures in synthetic medium, presence of motility, slightly curved Gram-negative rods morphology, gelatin liquefying activity, utilization of citrate as carbon source and production of bacteriochlorophyl a and carotenoids of the spirilloxanthin alternative series. R. gelatinosus may represent a source of nutrients and pigments with application in poultry feed.

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