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Where bacterioplankton carbon goes in oligotrophic systems? Diet or recycling

AuthorsVaqué, Dolors
Issue Date28-Nov-2013
CitationIntegrating New Advances in Mediterranean Oceanography and Marine Biology. Meeting program: 33 (2013)
AbstractDuring the last decades aquatic viruses have been recognized to be an important component of microbial food webs, with abundances of 10 milions per ml in surface waters they are considered the most abundant biological entities, and represent the highest genomic diversity reservoir. The viruses present in the water column may infect fishes and mammals but its majority infects phytoplankton and bacterioplankton. The net effect of viruses in the microbial food web, described as 'the viral shunt' consists of transforming the particulate organic matter of the host into more viruses, and returning biomass in the form of dissolved and colloidal organic matter to the water column. This can be consumed by other bacteria and allowing the retention of nutrients in the euphotic zone. Furthermore, bacteria can also be predated by bacterivores being a carbon source for pico/nanoplanktonic protists. It seems plausible that in oligotrophic areas, as in the Mediterranean Sea, bacterial carbon would be mainly channeled through protists to higher trophic levels that can swim to get their preys. In contrast, the probability rates for a virus to infect a bacterium should be low and will be translated in a lower production of dissolved organic matter from bacterial lysates. Nevertheless, we will show evidences and discuss that even in oligotrophic systems, the viral lysis could be an important pathway for the flow of bacterial dissolved carbon compared to the bacterial carbon diet for protists
DescriptionSymposium on Integrating New Advances in Mediterranean Oceanography and Marine Biology, 26-29 November 2013, Institut de Ciències del Mar (CSIC), Barcelona, Catalunya, Spain
Publisher version (URL)http://www.icm.csic.es/bio/medocean/information.htm#schedule
Appears in Collections:(ICM) Comunicaciones congresos
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