Säwström Christin, Granéli Wilhelm, Laybourn-Parry Johanna, Anesio Alexandre M
Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden.
Environ Microbiol. 2007 Jan;9(1):250-5. doi: 10.1111/j.1462-2920.2006.01135.x.
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.
在南极和北极的超贫营养淡水环境中，测定了可见噬菌体感染细菌细胞的频率（FVIB）以及每个细胞的噬菌体平均数量[即裂解量（BS）]。从两个南极淡水湖以及北极一座冰川的冰尘坑采集了水样。这项两极研究的数据显示，FVIB是文献中报道过的最高值（平均26.1%，范围为5.1%至66.7%），而BS是最低值（平均4，范围为2 - 15）。在这些超贫营养淡水环境中，细菌密度较低，但很大比例的细菌受到了可见感染。我们的结果表明，即使宿主密度低且生长通常缓慢，在这些极端环境中仍可维持恒定的浮游病毒种群。
