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Viral dynamics and patterns of lysogeny in saline Antarctic lakes

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Laybourn-Parry, J and Marshall, WA and Madan, NJ (2007) Viral dynamics and patterns of lysogeny in saline Antarctic lakes. Polar Biology, 30 (3). pp. 351-358. ISSN 0722-4060

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Abstract

Antarctic lakes are extreme ecosystems with microbially dominated food webs, in which viruses may be important in controlling community dynamics. A year long investigation of two Antarctic saline lakes (Ace and Pendant Lakes) revealed high concentrations of virus like particles (VLP) (0.20–1.26 × 108 ml−1), high VLP: bacteria ratios (maximum 70.6) and a seasonal pattern of lysogeny differing from that seen at lower latitudes. Highest rates of lysogeny (up to 32% in Pendant Lake and 71% in Ace Lake) occurred in winter and spring, with low or no lysogeny in summer. Rates of virus production (range 0.176–0.823 × 106 viruses ml−1 h−1) were comparable to lower latitude freshwater lakes. In Ace Lake VLP did not correlate with bacterial cell concentration or bacterial production but correlated positively with primary production, while in Pendant Lake VLP abundance correlated positively with both bacterial cell numbers and bacterial production but not with primary production. In terms of virus and bacterial dynamics the two saline Antarctic lakes studied appear distinct from other aquatic ecosystems investigated so far, in having very high viral to bacterial ratios (VBR) and a very high occurrence of lysogeny in winter.

Item Type: Article
Keywords: Antarctic lakes · Bacteria · Lysogeny · Primary production · Production · Viruses
Journal or Publication Title: Polar Biology
Page Range: pp. 351-358
ISSN: 0722-4060
Identification Number - DOI: 10.1007/s00300-006-0191-9
Additional Information:

The original publication is available at www.springerlink.com

Date Deposited: 11 Mar 2008 22:50
Last Modified: 18 Nov 2014 03:31
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