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
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Creator |
Parvathi, A.
Zhong, X. Jacquet, S. |
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Subject |
MICROBIOLOGY::Genetics and evolution
AQUATIC COMMUNITIES::Phytoplankton AQUATIC ECOLOGY, PRODUCTIVITY::Species interactions |
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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.
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Date |
2015-11-06T06:01:34Z
2015-11-06T06:01:34Z 2012 |
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Type |
Journal Article
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Identifier |
Advances in Oceanography and Limnology, vol.3(2); 2012; 171-191.
http://drs.nio.org/drs/handle/2264/4861 |
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Language |
en
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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 |
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Publisher |
Taylor and Francis
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