Dissolved Primary Production and the Strength of Phytoplankton– Bacterioplankton Coupling in Contrasting Marine Regions
Dissolved Primary Production and the Strength of Phytoplankton– Bacterioplankton Coupling in Contrasting Marine Regions
复制标题
对比海洋区域的溶解初级生产和浮游植物-浮游细菌耦合的强度
DOI：
10.1007/s00248-002-1026-z
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发表时间：
2002
影响因子：
3.6
通讯作者：
C. Pedrós
中科院分区：
文献类型：
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作者：
Xosé Anxelu G. Morán;Marta Estrada;J. Gasol;C. Pedrós
我们通过比较四个对比海洋区域的颗粒物（PPP）和溶解性初级生产力（DPP）与细菌碳需求（BCD）的比率，分析了浮游植物-浮游细菌耦合的强度：南大洋的近海和沿海沃茨，东北大西洋的沿海地区，以及地中海西北部的沿海-近海断面。我们测量了细菌异养生产（BHP）和估计BCD从文献模型。平均植物生长素胞外释放百分比[PER = DPP/（DPP + PPP）]在南极（分别为近海和沿海）为18-20%，在地中海西北部为16%，在大西洋东北部为7%。一个显着的负相关关系，发现PER和总系统生产力与汇总数据。平均而言，BHP占所有地区总初级生产量的5%以下。然而，被估计为DPP在满足BCD方面的潜在重要性的浮游植物-浮游细菌耦合的强度在四个区域中差异很大。在南极近海沃茨，DPP与BCD高度相关，足以满足BCD。相比之下，BCD超过DPP，并且在其余区域中没有显著关系。这些数据表明，强烈依赖于藻类细胞外生产的细菌，预计只有在开放的海洋环境中隔离的DOC沿海输入。
We analyzed the strength of phytoplankton–bacterioplankton coupling by comparing the rate of particulate (PPP) and dissolved primary production (DPP) with bacterial carbon demand (BCD) in four contrasting marine regions: offshore and coastal waters of the Southern Ocean, a coastal area of the NE Atlantic, and a coastal–offshore transect in the NW Mediterranean. We measured bacterial heterotrophic production (BHP) and estimated BCD from a literature model. Average phytoplanktonic percent extracellular release [PER = DPP/(DPP + PPP)] was 18–20% in the Antarctic (offshore and coastal, respectively), 16% in the NW Mediterranean, and 7% in the NE Atlantic. A significant inverse relationship was found between PER and total system productivity with pooled data. On average BHP amounted to <5% of total primary production in all regions. However, the strength of phytoplankton–bacterioplankton coupling, estimated as the potential importance of DPP in meeting BCD, differed greatly in the four regions. DPP was highly correlated to BCD in offshore Antarctic waters and was sufficient to meet BCD. In contrast, BCD exceeded DPP and bore no significant relationship in the remaining regions. The data suggest that a strong dependence of bacteria on algal extracellular production is only expected in open-ocean environments isolated from coastal inputs of DOC.