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High viral infection rates in Antarctic and Arctic bacterioplankton


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Säwström, C, Granéli, W, Laybourn-Parry, J and Anesio, AM 2007 , 'High viral infection rates in Antarctic and Arctic bacterioplankton' , Environmental Microbiology, vol. 9, no. 1 , pp. 250-255 , doi: 10.1111/j.1462-2920.2006.01135.x.

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The frequency of visibly phage-infected bacterial
cells (FVIB) and the average number of phages
per cell [i.e. burst size (BS)] were determined in
Antarctic and Arctic ultra-oligotrophic freshwater
environments. Water samples were collected from
two Antarctic freshwater lakes and cryoconite holes
from a glacier in the Arctic. Data from this bipolar
study show the highest FVIB (average 26.1%, range
5.1% to 66.7%) and the lowest BS (average 4, range
2–15) ever reported in the literature. The bacterial
density is low in these ultra-oligotrophic freshwater
environments but a large proportion of the bacteria
are visibly infected. Our results suggest that a constant
virioplankton population can be maintained in
these extreme environments even though host
density is low and often slow growing.

Item Type: Article
Authors/Creators:Säwström, C and Granéli, W and Laybourn-Parry, J and Anesio, AM
Journal or Publication Title: Environmental Microbiology
ISSN: 1462-2912
DOI / ID Number: 10.1111/j.1462-2920.2006.01135.x
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