Factors controlling the year-round variability in carbon flux through bacteria in a coastal marine system

被引:117
作者
Alonso-Saez, Laura [1 ,2 ]
Vazquez-Dominguez, Evaristo [1 ]
Cardelus, Clara [1 ]
Pinhassi, Jarone [1 ,3 ]
Sala, M. Montserrat [1 ]
Lekunberri, Itziar [1 ]
Balague, Vanessa [1 ]
Vila-Costa, Maria [1 ,4 ]
Unrein, Fernando [1 ,5 ]
Massana, Ramon [1 ]
Simo, Rafel [1 ]
Gasol, Josep M. [1 ]
机构
[1] CSIC, Inst Ciencias Mar, CMIMA, Dept Biol Marina & Oceanog, Barcelona, Catalunya, Spain
[2] Uppsala Univ, Dept Ecol & Evolut, Uppsala, Sweden
[3] Univ Kalmar, Dept Biol & Environm Sci, Kalmar, Sweden
[4] Univ Georgia, Dept Marine Sci, Athens, GA 30602 USA
[5] INTECH, IIB, Buenos Aires, DF, Argentina
关键词
bacterioplankton; production; respiration; carbon; marine; seasonality; growth efficiency; coastal;
D O I
10.1007/s10021-008-9129-0
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Data from several years of monthly samplings are combined with a 1-year detailed study of carbon flux through bacteria at a NW Mediterranean coastal site to delineate the bacterial role in carbon use and to assess whether environmental factors or bacterial assemblage composition affected the in situ rates of bacterial carbon processing. Leucine (Leu) uptake rates [as an estimate of bacterial heterotrophic production (BHP)] showed high interannual variability but, on average, lower values were found in winter (around 50 pM Leu(-1) h(-1)) as compared to summer (around 150 pM Leu(-1) h(-1)). Leu-to-carbon conversion factors ranged from 0.9 to 3.6 kgC mol Leu(-1), with generally higher values in winter. Leu uptake was only weakly correlated to temperature, and over a full-year cycle (in 2003), Leu uptake peaked concomitantly with winter chlorophyll a (Chl a) maxima, and in periods of high ectoenzyme activities in spring and summer. This suggests that both low molecular weight dissolved organic matter (DOM) released by phytoplankton, and high molecular weight DOM in periods of low Chl a, can enhance BHP. Bacterial respiration (BR, range 7-48 mu g C l(-1) d(-1)) was not correlated to BHP or temperature, but was significantly correlated to DOC concentration. Total bacterial carbon demand (BHP plus BR) was only met by dissolved organic carbon produced by phytoplankton during the winter period. We measured bacterial growth efficiencies by the short-term and the long-term methods and they ranged from 3 to 42%, increasing during the phytoplankton blooms in winter (during the Chl a peaks), and in spring. Changes in bacterioplankton assemblage structure (as depicted by denaturing gradient gel electrophoresis fingerprinting) were not coupled to changes in ecosystem functioning, at least in bacterial carbon use.
引用
收藏
页码:397 / 409
页数:13
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