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Dynamics of various viral groups infecting autotrophic plankton in Lake Geneva

DRS at CSIR-National Institute of Oceanography

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Title Dynamics of various viral groups infecting autotrophic plankton in Lake Geneva
 
Creator Parvathi, A.
Zhong, X.
Jacquet, S.
 
Subject MICROBIOLOGY::Genetics and evolution
AQUATIC COMMUNITIES::Phytoplankton
AQUATIC ECOLOGY, PRODUCTIVITY::Species interactions
 
Description Viral community structure and dynamics were investigated for the first time in surface waters (0?20?m) of Lake Geneva over a 5-month period between July and November 2011. Abundances of autotrophic picoplankton, heterotrophic bacteria and virus-like particles determined using flow cytometry revealed their predominance during the summer months followed by a slight decrease in fall. Two groups of viruses could be discriminated, referred to as virus-like particles (VLP) group 1 and 2. The abundance of VLP1 correlated significantly with the bacterial abundance, while that of VLP2 correlated with both chlorophyll a and picocyanobacterial abundance suggesting a tight coupling between these viral groups and bacteria or phytoplankton. The abundance of cyanomyoviruses and cyanopodoviruses varied between 7.3???102?ml?1 (July) to 1.2???104?ml?1 (November) and 5.8???103?ml?1 (July) to 2.2???104?ml?1 (September), respectively. The abundance of the picocyanobacterial hosts was in concurrence with that of the cyanophages, being higher in late summer. Polymerase chain reaction denaturing gradient gel electrophoresis (PCR-DGGE) of viral signature genes such as g20, g23, mcp, polB, psbA and psbD revealed a relatively high richness within these genes with their diversity increasing towards the summer months. The diversity of psbD was found to be particularly high and correlated with picocyanobacterial abundance suggesting that cyanophages may be directly responsible for a significant proportion of carbon fixation in Lake Geneva.
 
Date 2015-11-06T06:01:34Z
2015-11-06T06:01:34Z
2012
 
Type Journal Article
 
Identifier Advances in Oceanography and Limnology, vol.3(2); 2012; 171-191.
http://drs.nio.org/drs/handle/2264/4861
 
Language en
 
Rights The final and definitive form of the preprint has been published in the "Advances in Oceanography and Limnology" ? 2012 Taylor & Francis; "Advances in Oceanography and Limnology" is available online at http://www.tandfonline.com with open URL of article : http://dx.doi.org/10.1080/19475721.2012.738157.
The term & condition associated with this preprint is at http://www.tandfonline.com/page/terms-and-conditions
 
Publisher Taylor and Francis