unprecedented evidence for high viral abundance and lytic activity in coral reef waters of the south pacific ocean
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2014
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Abstract
Despite nutrient-depleted conditions, coral reef waters harbor abundant and diverse microbes; as major agents of microbial mortality, viruses are likely to influence microbial processes in these ecosystems. However, little is known about marine viruses in these rapidly changing ecosystems. Here we examined spatial and short-term temporal variability in marine viral abundance and viral lytic activity across various reef habitats surrounding Moorea Island (French Polynesia) in the South Pacific. Water samples were collected along 4 regional cross-reef transects and during a time-series in Opunohu Bay. Results revealed high viral abundance (range: 5.6 x 106 – 3.6 x 107 viruses ml-1) and lytic viral production (range: 1.5 x 109 – 9.2 x 1010 viruses l-1 d-1). Flow cytometry revealed that viral assemblages were composed of three subsets that each displayed distinct spatiotemporal relationships with nutrient concentrations and autotrophic and heterotrophic microbial abundances. The results highlight dynamic shifts in viral community structure and imply that each of these three subsets is ecologically important and likely to infect distinct microbial hosts in reef waters. Based on viral-reduction approach, we estimate that lytic viruses were responsible for the removal of ca. 24% to 367% of bacterial standing stock d-1 and the release of ca. 1.1 to 62 µg of organic carbon l-1 d-1 in reef waters. Overall, this work demonstrates the highly dynamic distribution of viruses and their critical roles in controlling microbial mortality and nutrient cycling in coral reef water ecosystems.
| Reference Key |
payet2014frontiersunprecedented
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| Authors | ;Jérôme P. Payet;Jérôme P. Payet;Ryan eMcMinds;Deron eBurkepile;Rebecca eVega Thurber |
| Journal | journal of magnetic resonance (san diego, calif : 1997) |
| Year | 2014 |
| DOI |
10.3389/fmicb.2014.00493
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