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Release of bacterial DNA by marine nanoflagellates, an intermediate step in phosphorus regeneration
Marine Biological Station, Institute of Biology,Piran, Slovenia.
Department of Microbiology, University of Umeå. (Forskningsmiljön Man and Biosphere Health (MABH))ORCID iD: 0000-0002-8059-0156
Umeå Marine Sciences Centre, University of Umeå.
Department of Microbiology, University of Umeå.
1992 (English)In: Applied and Environmental Microbiology, ISSN 0099-2240, E-ISSN 1098-5336, Vol. 58, no 11, 3744-3750 p.Article in journal (Refereed) Published
Abstract [en]

The concentrations of dissolved DNA and nanoflagellates were found to covary during a study of diel dynamics of the microbial food web in the Adriatic Sea. This observation was further investigated in a continuous seawater culture when nanoflagellates were fed bacteria grown in filtered seawater. Analysis of dissolved organic phosphorus and dissolved DNA showed a sixfold increase of dissolved DNA in the presence of the nanoflagellates (Ochromonas sp.). The amount of DNA released suggested that the majority of the consumed bacterial DNA was ejected. Phagotrophic nanoflagellates thus represent an important source of origin for dissolved DNA. The rate of breakdown of dissolved DNA and release of inorganic phosphorus in the pelagic ecosystem is suggested to be dependent on the ambient phosphate pool. In the P-limited northern Adriatic Sea, rapid degradation of the labelled DNA could be demonstrated, whereas the N-limited southern California bight water showed a much lower rate. Phosphorus originating from dissolved DNA was shown to be transferred mainly to organisms in the <3-μm-size fractions. On the basis of the C/P ratios, we suggest that a significant fraction of the phosphorus demand by the autotrophs may be sustained by the released DNA during stratified conditions. Thus, the nucleic acid-rich bacterial biomass grazed by protozoa plays an important role in the biogeochemical cycling of phosphorus in the marine environment.

Place, publisher, year, edition, pages
1992. Vol. 58, no 11, 3744-3750 p.
National Category
Microbiology
Identifiers
URN: urn:nbn:se:hkr:diva-10328DOI: 099-2240/92/113744-07ISI: A1992JW47300042PubMedID: 16348813OAI: oai:DiVA.org:hkr-10328DiVA: diva2:611895
Available from: 2013-03-19 Created: 2013-03-19 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Use of 16S ribosomal RNA probes for the detection of marine bacteria
Open this publication in new window or tab >>Use of 16S ribosomal RNA probes for the detection of marine bacteria
1994 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Umåe: Univ., 1994. 35 p.
National Category
Microbiology
Identifiers
urn:nbn:se:hkr:diva-10356 (URN)91-7174-888-1 (ISBN)
Available from: 2013-04-03 Created: 2013-04-03 Last updated: 2014-06-24Bibliographically approved

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Rehnstam, Ann-Sofi

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