Title Microbial community at the front of Ecology Glacier (King George Island, Antarctica); initial observations
Author Grzesiak, J.; Zmuda-Baranowska, M.; Borsuk, P.; Zdanowski, M.
Author Affil Grzesiak, J., Polska Akademia Nauk, Zaklad Biologii Antarktyki, Warsaw, Poland. Other: Uniwersytet Warszawski, Poland
Source Polish Polar Research, 30(1), p.37-47, . Publisher: Panstwowe Wydawnictwo Naukowe, Warsaw, Poland. ISSN: 0138- 0338
Publication Date 2009
Notes In English. 29 refs. Ant. Acc. No: 86120. CRREL Acc. No: 63004471
Index Terms bacteria; animals; ecology; glaciers; ice cover; Antarctica--King George Island; Antarctica; biota; deglaciation; Ecology Glacier; habitat; ice cover distribution; International Polar Year 2007-08; IPY 2007-08 Research Publications; King George Island; Scotia Sea Islands; South Shetland Islands
Abstract Since 1978 the retreat of Ecology Glacier in the vicinity of Henryk Arctowski Station has opened new ice-free areas for colonization by terrestrial organisms initiated by pioneer microbes. Samples were collected from the soil surface, at 0,5 and 20 cm below surface close to glacier front, then stored at below -200C. Total bacterial count (TC), estimated by epifluorescence microscopy, reached high values, of 1010 g-1 dry wt. Healthy looking bacterial cells of mean volume 0.0209 m3 at 0 cm to 0.0292 m3 at 20 cm made up from 7% at 0 cm, to 30% at 20 cm of total bacterial population. The number of colony forming units (CFU) accounted for only 0.02% of TC. Taxonomically they belonged to the alpha a, beta , gamma subdivisions of the proteobacteria and to the Cytophaga-Flavobacterium-Bacteroides (CFB) group. Morphophysiologically CFU bacteria were diverse, from Gram variable short coccal forms to very long rods or filaments. Randomly selected CFU colonies were characterized by low sugar assimilation and high esterase/lipase activity. Spore forming bacteria--absent from 0 and 5 cm, formed a small fraction of 175 cells g-1 dry wt at the 20 cm depth. Filamentous fungi were relatively abundant and represented mainly by oligotrophs.
Publication Type journal article
Record ID 292304