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Biogeography of terrestrial cyanobacteria from Antarctic ice-free areas

  • Z. Namsaraev (a1) (a2), M.-J. Mano (a1), R. Fernandez (a1) and Annick Wilmotte (a1)

Abstract

Cyanobacteria inhabit the Antarctic continent and have even been observed in the most southerly ice-free areas of Antarctica (86–87° S). The highest molecular diversity of cyanobacterial communities was found in the areas located between 70° S and 80° S. Further south and further north from this zone, the diversity abruptly decreased. Seventy-nine per cent (33 of 42 operational taxonomic units) of Antarctic terrestrial cyanobacteria have a cosmopolitan distribution. Analysis of the sampling efforts shows that only three regions (southern Victoria Land, the Sør Rondane Mountains and Alexander Island) have been particularly well studied, while other areas did not receive enough attention. Although cyanobacteria possess a capacity for long-range transport, regional populations in Antarctic ice-free areas seem to exist. The cyanobacterial communities of the three most intensively studied regions, separated from each other by a distance of 3000–3400 km, had a low degree of similarity with each other. Further development of microbial biogeography demands a standardized approach. For this purpose, as a minimal standard, we suggest using the sequence of cyanobacterial 16S rRNA gene between Escherichia coli positions 405 and 780.

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Biogeography of terrestrial cyanobacteria from Antarctic ice-free areas

  • Z. Namsaraev (a1) (a2), M.-J. Mano (a1), R. Fernandez (a1) and Annick Wilmotte (a1)

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