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Diel variations in bacterial heterotrophic activity and growth in the northwestern Mediterranean Sea
Gasol, JM; Doval, MD; Pinhassi, J; Calderon-Paz, JI; Guixa-Boixareu, N; Vaque, D; Pedros-Alio, C
1998
发表期刊MARINE ECOLOGY-PROGRESS SERIES
ISSN0171-8630
卷号164页码:107-124
摘要Primary producers must respond to the diel changes in light availability. Therefore, detection of diel cycles in bacterial activity would imply tight coupling between the production of photosynthetic dissolved organic carbon (DOC) and its consumption by bacteria. Absence of diel cycles, on the contrary, would indicate that bacteria depend largely upon allochthonous organic carbon and that bacteria are not tightly dependent on photosynthetically produced autochthonous carbon. In 1993 and 1994 we sampled 3 sites in the NW Mediterranean Sea several times a day, and measured several microbial parameters as well as the vertical profiles of DOC along the diel cycle. The sites were selected so that one was on the continental shelf and, thus, was more influenced by coastal runoff; a second one was over the shelf slope and a third, oceanic one was located further offshore over a depth of 2000 m. We found clear diel cycles in bacterial total and specific activity always in the oceanic stations and sometimes in the shelf slope stations. Diel changes were detected as changes in both DNA and protein synthesis rates. These diel cycles were accompanied by diel changes in the distribution of total DOG, and by diel changes in the proportion of bacteria containing visible nucleoids. Noon estimates of bacterial activity were more than twice the daily average in the oceanic site, but they were less different in the other 2 sites. DOC changed daily by 15 mu M (5 to 15 % of the total stock). For bacterial activity to explain the diel changes in DOC concentration, bacteria should have growth efficiencies lower than 10% in general, and lower than 2% in the oceanic station.
部门归属CSIC, Inst Ciencies Mar, E-08039 Barcelona, Spain; CSIC, Inst Invest Marinas, E-36208 Vigo, Spain; Umea Univ, Dept Microbiol, S-90187 Umea, Sweden
关键词Bacterial Production Mediterranean Diel Cycles Doc Diel Changes Nucleoid-containing Bacteria Bacterial Carbon Conversion Efficiencies
学科领域Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Oceanography
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语种英语
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/9344
专题海洋微食物网高被引文献
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Gasol, JM,Doval, MD,Pinhassi, J,et al. Diel variations in bacterial heterotrophic activity and growth in the northwestern Mediterranean Sea[J]. MARINE ECOLOGY-PROGRESS SERIES,1998,164:107-124.
APA Gasol, JM.,Doval, MD.,Pinhassi, J.,Calderon-Paz, JI.,Guixa-Boixareu, N.,...&Pedros-Alio, C.(1998).Diel variations in bacterial heterotrophic activity and growth in the northwestern Mediterranean Sea.MARINE ECOLOGY-PROGRESS SERIES,164,107-124.
MLA Gasol, JM,et al."Diel variations in bacterial heterotrophic activity and growth in the northwestern Mediterranean Sea".MARINE ECOLOGY-PROGRESS SERIES 164(1998):107-124.
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