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Periodic bacterivore activity balances bacterial-growth in the marine-environment
Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). Umeå University, Faculty of Science and Technology, Department of Molecular Biology (Faculty of Science and Technology). (Johan Wikner ; UMFpub)
Umeå University, Faculty of Science and Technology, Department of Molecular Biology (Faculty of Science and Technology). Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF).
1990 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 35, no 2, 313-324 p.Article in journal (Refereed) Published
Abstract [en]

The grazing rate of pelagic bacteria was repeatedly determined during 36-h time-course experiments with the minicell recapture technique. Die1 variation in the rate of grazing occurred in all water masses investigated. Maximal rates reached 2 x lo5 cells ml-’ h-r, whereas minimal values were 20 times lower. Highest grazing rates were found during the day in most cases, but grazing could also dominate at night as found in one study. Die1 periodicity was mainly due to variation in the per-cell feeding rate of bacterivorous flagellates. Accumulation of the bacterial biomass into the l-3-pm size fraction was positively correlated with changes in bacterial grazing. The transfer efficiency to organisms z 10 pm was low. On average, the daily grazing rate equaled 60% of the bacterial standing stock, exceeding bacterial growth by a factor of 2.6, as estimated from [3H]thymidine incorporation.

Place, publisher, year, edition, pages
American Society of Limnology and Oceanography, 1990. Vol. 35, no 2, 313-324 p.
National Category
Microbiology
Identifiers
URN: urn:nbn:se:umu:diva-52559ISI: A1990DR94700006OAI: oai:DiVA.org:umu-52559DiVA: diva2:506369
Available from: 2012-02-28 Created: 2012-02-24 Last updated: 2017-10-24
In thesis
1. Predation on marine pelagic bacteria: On the in situ rates, regulation and dynamics of bacterivory studied with a molecular genetic technique
Open this publication in new window or tab >>Predation on marine pelagic bacteria: On the in situ rates, regulation and dynamics of bacterivory studied with a molecular genetic technique
1989 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Umeå: Umeå universitet, 1989. 58 p.
Keyword
Marine, grazing, minicells, molecular genetics, method, predation rate, dynamics, bacterivore, predator-prey
National Category
Microbiology
Research subject
Microbiology
Identifiers
urn:nbn:se:umu:diva-52569 (URN)91-7174-418-5 (ISBN)
Public defence
1989-05-26, Institutionen för Mikrobiologi, Föreläsningssalen, Umeå Universitet 901 87, Umeå, 09:00 (English)
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Available from: 2012-03-05 Created: 2012-02-24 Last updated: 2012-03-05Bibliographically approved

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Wikner, Johan

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