The production of volatile iodocarbons by biogenic marine aggregates
The production of volatile iodocarbons by biogenic marine aggregates
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DOI：
10.4319/lo.2008.53.2.0867
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发表时间：
2008-03-01
影响因子：
4.5
通讯作者：
Nightingale, P. D.
中科院分区：
文献类型：
--
作者：
Hughes, C.;Malin, G.;Nightingale, P. D.
我们提出了第一次报告的测量挥发性碘碳生产的生物海洋聚集体。碘甲烷（CH_3 I），碘乙烷（C_2 H_5I），2-碘丙烷（CH_3CH_3CH_3），和1-碘丙烷（CH_3CH_2CH_2 I）的浓度进行了测定，在凯尔特海的一个现场活动期间，通过浓缩>53 μ m的浮游生物部分形成的聚集体的孵育。相对于过滤海水对照，所有四种碘化碳在聚集体孵育物中的浓度显著增加。最大生成速率范围为CH 3CHICH 3的0.01 pmol L-1 h（-1）至C2 H5 I的0.31 pmol L-1 h（-1）。伴随的脱镁色素和细菌异养生产表明，发生在研究的聚集体的过程是一个很好的代表那些已知发生在天然海洋颗粒。我们还报告了在天然海洋聚集体中观察到的碘碳生产率，包括在凯尔特海收集的硅藻粘液和在北极Kongsfjord采样的植物碎屑。碎屑颗粒可能是海洋环境中产生碘碳的热点。
We present the first reported measurements of volatile iodocarbon production by biogenic marine aggregates. Iodomethane (CH3I), iodoethane (C2H5I), 2-iodopropane (CH3CHICH3), and 1-iodopropane (CH3CH2CH2I) concentrations were determined in incubations of aggregates formed by concentrating the >53 mu m fraction of the plankton during a field campaign in the Celtic Sea. All four iodocarbons increased significantly in concentration in the aggregate incubations relative to filtered seawater controls. Maximum production rates ranged from 0.01 pmol L-1 h(-1) for CH3CHICH3 to 0.31 pmol L-1 h(-1) for C2H5I. Accompanying pheopigment and bacterial heterotrophic production suggest that the processes taking place on the aggregates studied were a good representation of those known to occur on natural marine particles. We also report iodocarbon production rates observed in natural marine aggregates, including a diatom mucilage collected in the Celtic Sea and phytodetritus sampled from Kongsfjord in the Arctic. Detrital particles could be hotspots of iodocarbon production in the marine environment.