Red coralline algae as a source of marine biogenic dimethylsulphoniopropionate
Red coralline algae as a source of marine biogenic dimethylsulphoniopropionate
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DOI：
10.3354/meps07687
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发表时间：
2008-01-01
影响因子：
2.5
通讯作者：
Moore, P. Geoffrey
中科院分区：
文献类型：
--
作者：
Kamenos, Nicholas A.;Strong, Sarah C.;Moore, P. Geoffrey
由二甲基磺基丙酸酯（DMSP）衍生的生物源气体二甲基硫（DMS）通过形成气溶胶和云凝结核在地球大气中起着重要作用，从而在气候调节中起着重要作用。据估计，DMS的生物来源占大气硫负荷的42%（平均值），值得注意的是，其中90%以上来自海洋来源。浮游植物、大型藻类和珊瑚被认为是海洋生物源DMSP的主要生产者。红珊瑚藻（称为红珊瑚或红柱石）覆盖海底的广大地区，然而，尽管它们在全球广泛分布，但形成红珊瑚的珊瑚藻很少或根本没有受到关于其DMSP生产力的关注。在本研究中，我们首次报告了DMSP的发生在2种马鲛。发现软组织中DMSP浓度平均为1914 nmol g（-1），Maerl床中DMSP浓度估计为637 μ mol m（-2）。在培养实验中，maerl导致周围海水中溶解的DMSP（DMSPd）以57.4至767.6 nmol m（-2）d（-1）的速率增加，表明maerl有助于邻近水柱中DMSPd的浓度。结果表明，Maerl层是海洋环境中DMSP的一个以前未发现的来源。有必要开展进一步研究，以评估maerl作为DMSP来源的重要性以及珊瑚藻在生物硫循环中可能发挥的作用。
The biogenic gas dimethylsulphide (DMS), derived from dimethylsulphoniopropionate (DMSP), plays an important role in the Earth's albedo, and thus climate regulation, through the formation of aerosols and cloud condensation nuclei. It is estimated that biogenic sources of DMS contribute 42% (mean) of the atmospheric sulphur burden and, significantly, > 90% of that contribution is derived from marine sources. Phytoplankton, macroalgae and corals are thought to be the main producers of marine biogenic DMSP. Red coralline algae (known as maerl or rhodoliths) cover extensive areas of seabed, yet despite their widespread global distribution, maerl-forming coralline algae have received little or no attention regarding their DMSP productivity. In the present study we report for the first time the occurrence of DMSP in 2 species of maerl. DMSP concentrations were found to average 1914 nmol g(-1) for soft tissue and estimated to be 637 mu mol m(-2) for maerl beds. In incubation experiments, maerl led to a dissolved DMSP (DMSPd) increase at a rate of 57.4 to 767.6 nmol m(-2) d(-1) in surrounding seawater, indicating that maerl contributes to DMSPd concentrations in the adjacent water column. Results show that maerl beds are a previously undiscovered source of DMSP in the marine environment. Further study is warranted to assess the significance of maerl as a source of DMSP and the role coralline algae may play in the biogenic sulphur cycle.