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High viral infection rates in Antarctic and Arctic bacterioplankton


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Säwström, C and Granéli, W and Laybourn-Parry, J and Anesio, AM (2007) High viral infection rates in Antarctic and Arctic bacterioplankton. Environmental Microbiology, 9 (1). pp. 250-255. ISSN 1462-2912

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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
Journal or Publication Title: Environmental Microbiology
Page Range: pp. 250-255
ISSN: 1462-2912
Identification Number - DOI: 10.1111/j.1462-2920.2006.01135.x
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Date Deposited: 11 Mar 2008 22:23
Last Modified: 18 Nov 2014 03:31
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