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Growth stimulation of bacterioplankton from deep waters of the NW Mediterranean

AuthorsBorrull, Encarnación ; Ortega-Retuerta, E. ; Antequera, C. ; Aparicio, Francisco Luis ; Marrasé, Cèlia ; Gasol, Josep M. ; Sala, M. Montserrat
Issue Date26-Nov-2013
CitationIntegrating New Advances in Mediterranean Oceanography and Marine Biology. Meeting program: 54 (2013)
AbstractBacteria in the deep ocean are present at very low concentrations, compared to upper layers. A possible limitation of their growth might be the availability or the lability of inorganic or organic nutrients. In order to test this hypothesis, we carried out a set of experiments to study the response of deep-water heterotrophic bacteria to the addition of different organic nutrients. Deep water was collected from the NW Mediterranean Sea in four different cruises during 2012 and 2013 from the same area of the NW Mediterranean. Water was filtered through 0.6 μm to avoid the presence of predators. One-liter microcosms were incubated during 2-3 days in the dark at in situ temperature. Duplicate treatments consisted in the addition of different carbon sources (24 μM C), or inorganic nutrients (ammonium, nitrate and phosphate, final concentrations 2.4, 44.7 and 0.6-1.29 μM, respectively). The results of the first experiments showed that a carbon source (glucose) and not inorganic nutrients, stimulated bacterial growth. This suggested that bacterial limitation was limited by carbon. In the following experiments, a more detailed analysis of the carbon sources that could stimulate the growth of bacterioplankton in deep waters was done. The results of those experiments suggest that bacteria prefer mainly two sources of dissolved organic matter: 1) derived from phytoplanktonic cultures, or 2) water collected from the deep chlorophyll maximum filtered through 0.2 μm. This might be very likely due to its higher complexity, compared to glucose, cellulose or chitin, but also to the higher lability in comparison to dissolved organic matter of river origin
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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