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Bacterioplankton intra-annual variability: importance of hydrography and competition
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). (Johan Wikner)
Havsmiljöinstitutet, Göteborg.
1999 (English)In: Aquatic Microbial Ecology, ISSN 0948-3055, E-ISSN 1616-1564, Vol. 20, no 3, 245-260 p.Article in journal (Refereed) Published
Abstract [en]

Field data from a 1.5 yr intensive study of 1 coastal (0 to 20 m) and 2 offshore stations (0 to 100 m) in the northern Baltic were analysed. Specific interest was paid to the difference in the spatiotemporal variation of bacterioplankton and its controlling factors. Less than 31% of the annual bacterial biomass production (P-b) occurred in the photic zone during the productive season at the offshore stations. This suggested an uncoupling between P-b and phytoplankton carbon fixation, which was further supported by the lack of a significant correlation between these variables in the photic zone. The basin with high allochthonous loading and long residence time showed high P-b relative to autochthonous carbon fixation and low variance of P-b and bacterial abundance (N-b), suggesting an important contribution of terrestrial dissolved organic carbon to the carbon and energy supply. Bacterial per capita growth rate (r(c)) was highest during spring, while P-b was highest during summer at all stations. The seasonal variation in P-b was mainly explained by variation in the r(c), rather than in N-b. A positive correlation of N-b with temperature. and a negative correlation with salinity, suggested that >61% of the seasonal variation in N-b was a consequence of the formation of a stratified photic zone with a higher carrying capacity. Temperature limitation of r(c) only occurred in the stratified photic zone, suggesting that other growth factors were sufficient during this period. A density limitation of the maximum r(c) was observed at all stations during autumn and winter in both depth layers, suggesting competition to be of periodic importance. Bacterioplankton with a low r (intrinsic growth rate) and high K (carrying capacity) strategy dominated when sedimenting particles were a major resource in the aphotic zone, while the opposite strategy dominated during winter at low cell densities, when dissolved substrates were the major resource.

Place, publisher, year, edition, pages
Oldendorf: Inter-Research , 1999. Vol. 20, no 3, 245-260 p.
Keyword [en]
estuarine, pelagic, bacteria, growth, abundance, seasonal, temperature, salinity, control, competition
National Category
URN: urn:nbn:se:umu:diva-52547DOI: 10.3354/ame020245ISI: 000085129700004OAI: diva2:506341
Available from: 2012-02-28 Created: 2012-02-24 Last updated: 2012-02-28

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Wikner, Johan
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Department of Molecular Biology (Faculty of Science and Technology)Umeå Marine Sciences Centre (UMF)
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