Biological turnover of DMS, DMSP and DMSO in contrasting open-sea waters
Biological turnover of DMS, DMSP and DMSO in contrasting open-sea waters
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DOI：
10.3354/meps203001
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发表时间：
2000-09
影响因子：
2.5
通讯作者：
R. Simó;C. Pedrós-Alió;G. Malin;J. Grimalt
中科院分区：
文献类型：
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作者：
R. Simó;C. Pedrós-Alió;G. Malin;J. Grimalt
研究了地中海西部开阔水域、北海近海岸和北大西洋副极地水域甲基化硫化物二甲基硫醚（DMS）、二甲基磺基丙酸酯（DMSP）和二甲基亚砜（DMSO）的形态和周转，叶绿素a浓度跨越2个数量级（0.12至13 µg l-1）。颗粒DMSP（DMSPp：5至340 nM）是大多数沃茨的主要池。还发现了显著浓度的溶解和颗粒二甲基亚砜（DMSOd：2至25 nM，DMSOp：3至16 nM）。生物学DMSP消耗速率根据黑暗孵育中总（溶解+颗粒）DMSP浓度的时间进程进行估计。二甲硫醚的生产和消费速率由“抑制剂添加”法测定。在北海沃茨的棕囊藻水华期间发现了高的DMS生产和消耗速率。在所有样品中，总DMSP和DMS的周转时间常数具有相同的数量级，分别为0.7 - 5.4和0.3 - 2.1 d。DMS的形成是9至96%的DMSP消耗的命运。使用氯仿作为抑制剂的DMS的生产和消费率估计约70%，高于二甲基二硫醚和二甲基硒。在一些孵育实验中，首次沿着DMS和DMSP跟踪DMSO浓度的时间过程。积极的生物循环（生产和消费）的DMSO在海水中的证据。
Speciation and turnover of the methylated sulfur compounds dimethyl sulfide (DMS), dimethylsulfoniopropionate (DMSP) and dimethyl sulfoxide (DMSO) were studied in waters of the open western Mediterranean, the near-coastal North Sea and the subpolar North Atlantic, with chlorophyll a concentrations spanning 2 orders of magnitude (0.12 to 13 µg l -1 ). Particulate DMSP (DMSPp: 5 to 340 nM) was the predominant pool in most waters. Dissolved and particulate dimethyl sulfoxide were also found at significant concentrations (DMSOd: 2 to 25 nM, DMSOp: 3 to 16 nM). Bio- logical DMSP consumption rates were estimated from the time course of total (dissolved + particu- late) DMSP concentration in dark incubations. Dimethyl sulfide production and consumption rates were determined by the 'inhibitor addition' method. High DMS production and consumption rates were found during a bloom of Phaeocystis sp. in North Sea waters. In all samples, turnover time con- stants for total DMSP and DMS were of the same order, ranging from 0.7 to 5.4 and from 0.3 to 2.1 d, respectively. DMS formation was the fate for 9 to 96% of the DMSP consumed. Use of chloroform as an inhibitor gave estimates of DMS production and consumption rates approximately 70% higher than those obtained with dimethyl disulfide and dimethyl selenide. In some incubation experiments, the time course of DMSO concentration has been followed along with DMS and DMSP for the first time. Evidence for active biological cycling (production and consumption) of DMSO in seawater is presented.