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Microbial Communities on Glacier Surfaces in Svalbard: Impact of Physical and Chemical Properties on Abundance and Structure of Cyanobacteria and Algae
Analysis of microbial communities occurring in three types of supraglacial habitats at several glaciers in the Arctic archipelago of Svalbard suggests that fine sediment with higher water content is the most suitable condition for bacteria, cyanobacteria, and algae. Expand
Biological processes on glacier and ice sheet surfaces
Glacial ice covers around 10% of the Earth's continents. A review of the literature suggests that microbes living on glaciers and ice sheets are an integral part of both the glacial environment andExpand
Relationships between the Arctic and the Antarctic cyanobacteria; three Phormidium-like strains evaluated by a polyphasic approach.
The polyphyletic position of strains of the genus Phormidium was confirmed, attesting the need to entirely revise classification in this taxon in the future and revealing a high degree of biodiversity that could not be unveiled using solely morphological evaluations. Expand
Microbial community structure and ecology of subglacial sediments in two polythermal Svalbard glaciers characterized by epifluorescence microscopy and PLFA
The results suggest that the subglacial microbial populations can be divided into two groups: autochthonous microorganims (chemoheterotrophic bacteria) and allochth onous that retain the ability to proliferate and give rise to active population when conditions become favorable. Expand
Seasonal and diel changes in photosynthetic activity of the snow alga Chlamydomonas nivalis (Chlorophyceae) from Svalbard determined by pulse amplitude modulation fluorometry.
The seasonal and diel dynamics of the physiological state and photosynthetic activity of the snow alga Chlamydomonas nivalis were investigated in a snowfield in Svalbard, where the algae may have obtained saturating light as deep as 3 cm in the snow when there were higher-light conditions, whereas they were undersaturated at prevalent low light even if on the surface. Expand
Aeolian flux of biotic and abiotic material in Taylor Valley, Antarctica
Abstract We studied patterns and mechanisms controlling wind-driven flux of soils and associated organic matter in Taylor Valley, Antarctica over a 10-year period using passive aeolian traps andExpand
Cyanobacterial diversity across landscape units in a polar desert: Taylor Valley, Antarctica.
The data show that the diversity of cyanobacteria increases from the upper portion of the valley towards the McMurdo Sound, likely due to the net transport of organisms in a down-valley direction, consistent with the prevailing orientation of high-energy, episodic föhn winds. Expand
Controls on microalgal community structures in cryoconite holes upon high-Arctic glaciers, Svalbard
It is proposed that, for the studied glaciers, nutrient levels related to recycling of limiting nutrients are the main factor driving variation in the community structure of microalgae and grazers. Expand
Response of Cyanobacteria and Algae from Antarctic Wetland Habitats to Freezing and Desiccation Stress
Vigor, after freezing and desiccation, was laboratory tested in cyanobacterial and algal strains from wetland habitats collected in maritime and continental Antarctica, and cyanobacteria from continental Antarctica were significantly more tolerant to low sub-zero temperatures than similar strains from maritime Antarctica. Expand
Morphological variability in selected heterocystous cyanobacterial strains as a response to varied temperature, light intensity and medium composition
The effect of temperature, light and nutrient composition on morphological traits was determined in seven nostocacean cyanobacteria and regularity of trichome coiling of A. spiroides depended on culture medium, suggesting that nutrient composition may be the main controlling factor. Expand