Viral infections stimulate the metabolism and shape prokaryotic assemblages in submarine mud volcanoes
- 15 December 2011
- journal article
- research article
- Published by Springer Science and Business Media LLC in The ISME Journal
- Vol. 6 (6), 1250-1259
- https://doi.org/10.1038/ismej.2011.185
Abstract
Mud volcanoes are geological structures in the oceans that have key roles in the functioning of the global ecosystem. Information on the dynamics of benthic viruses and their interactions with prokaryotes in mud volcano ecosystems is still completely lacking. We investigated the impact of viral infection on the mortality and assemblage structure of benthic prokaryotes of five mud volcanoes in the Mediterranean Sea. Mud volcano sediments promote high rates of viral production (1.65–7.89 × 109 viruses g−1 d−1), viral-induced prokaryotic mortality (VIPM) (33% cells killed per day) and heterotrophic prokaryotic production (3.0–8.3 μgC g−1 d−1) when compared with sediments outside the mud volcano area. The viral shunt (that is, the microbial biomass converted into dissolved organic matter as a result of viral infection, and thus diverted away from higher trophic levels) provides 49 mgC m−2 d−1, thus fuelling the metabolism of uninfected prokaryotes and contributing to the total C budget. Bacteria are the dominant components of prokaryotic assemblages in surface sediments of mud volcanoes, whereas archaea dominate the subsurface sediment layers. Multivariate multiple regression analyses show that prokaryotic assemblage composition is not only dependant on the geochemical features and processes of mud volcano ecosystems but also on synergistic interactions between bottom-up (that is, trophic resources) and top-down (that is, VIPM) controlling factors. Overall, these findings highlight the significant role of the viral shunt in sustaining the metabolism of prokaryotes and shaping their assemblage structure in mud volcano sediments, and they provide new clues for our understanding of the functioning of cold-seep ecosystems.Keywords
This publication has 49 references indexed in Scilit:
- Prokaryote diversity and viral production in deep-sea sediments and seamountsDeep Sea Research Part II: Topical Studies in Oceanography, 2009
- Viriobenthos in freshwater and marine sediments: a reviewFreshwater Biology, 2008
- Viral effects on bacterial respiration, production and growth efficiency: Consistent trends in the Southern Ocean and the Mediterranean SeaDeep Sea Research Part II: Topical Studies in Oceanography, 2008
- Marine viruses — major players in the global ecosystemNature Reviews Microbiology, 2007
- Diversity and Abundance of Aerobic and Anaerobic Methane Oxidizers at the Haakon Mosby Mud Volcano, Barents SeaApplied and Environmental Microbiology, 2007
- Viral infection plays a key role in extracellular DNA dynamics in marine anoxic systemsLimnology and Oceanography, 2007
- Microbial community in a sediment-hosted CO 2 lake of the southern Okinawa Trough hydrothermal systemProceedings of the National Academy of Sciences of the United States of America, 2006
- Assessment of Factors Influencing Direct Enumeration of Viruses within Estuarine SedimentsApplied and Environmental Microbiology, 2006
- Viruses in the seaNature, 2005
- Permutation tests for univariate or multivariate analysis of variance and regressionCanadian Journal of Fisheries and Aquatic Sciences, 2001