Spatiotemporal variability of dimethylsulphoniopropionate on a fringing coral reef: the role of reefal carbonate chemistry and environmental variability.
Spatiotemporal variability of dimethylsulphoniopropionate on a fringing coral reef: the role of reefal carbonate chemistry and environmental variability.
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DOI：
10.1371/journal.pone.0064651
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Kamenos NA
中科院分区：
文献类型：
--
作者：
Burdett HL;Donohue PJ;Hatton AD;Alwany MA;Kamenos NA
预计到 2100 年，海洋 pH 值将下降 0.5 个单位（这一过程称为海洋酸化，OA），从而降低海洋的碳酸钙饱和状态。由于沿海生境固有的自然变化，预计沿海海洋将经历碳酸盐饱和度更低的时期。因此，为了准确预测OA对沿海海洋的影响，我们必须首先了解其自然变化。海藻生产二甲基磺基丙酸酯 (DMSP) 以及 DMSP 分解产物二甲基硫醚 (DMS) 的释放通常与环境压力有关。本研究调查了热带大型藻类（Padina sp.、Amphiroa sp. 和 Turbinaria sp.）和上覆水柱对珊瑚礁碳酸盐化学自然变化的时空响应。我们在 45 小时的采样期内比较了埃及苏莱曼礁边缘环境稳定的礁顶和环境变化的礁滩之间的大型藻类细胞内 DMSP 和水柱 DMSP+DMS 浓度。在整个过程中观察到类似的昼夜模式：在夜间观察到最大细胞内 DMSP 和水柱 DMS/P 浓度，与最低碳酸盐饱和状态的时间一致。在空间上，水柱 DMS/P 浓度在以海草和大型藻类（溶解 DMS/P）和浮游植物（颗粒 DMS/P）为主的区域而不是珊瑚区域最高。这项研究表明，大型藻类可能在低碳酸盐饱和状态期间使用 DMSP 来维持代谢功能。在珊瑚礁系统中，海草和大型藻类可能是比珊瑚更重要的溶解 DMS/P 底栖生产者。在 OA 制度下，低碳酸盐饱和状态期间 DMS/P 浓度的增加可能在未来变得具有生态重要性，影响幼虫沉降并增加 DMS 的大气排放。
Oceanic pH is projected to decrease by up to 0.5 units by 2100 (a process known as ocean acidification, OA), reducing the calcium carbonate saturation state of the oceans. The coastal ocean is expected to experience periods of even lower carbonate saturation state because of the inherent natural variability of coastal habitats. Thus, in order to accurately project the impact of OA on the coastal ocean, we must first understand its natural variability. The production of dimethylsulphoniopropionate (DMSP) by marine algae and the release of DMSP’s breakdown product dimethylsulphide (DMS) are often related to environmental stress. This study investigated the spatiotemporal response of tropical macroalgae (Padina sp., Amphiroa sp. and Turbinaria sp.) and the overlying water column to natural changes in reefal carbonate chemistry. We compared macroalgal intracellular DMSP and water column DMSP+DMS concentrations between the environmentally stable reef crest and environmentally variable reef flat of the fringing Suleman Reef, Egypt, over 45-hour sampling periods. Similar diel patterns were observed throughout: maximum intracellular DMSP and water column DMS/P concentrations were observed at night, coinciding with the time of lowest carbonate saturation state. Spatially, water column DMS/P concentrations were highest over areas dominated by seagrass and macroalgae (dissolved DMS/P) and phytoplankton (particulate DMS/P) rather than corals. This research suggests that macroalgae may use DMSP to maintain metabolic function during periods of low carbonate saturation state. In the reef system, seagrass and macroalgae may be more important benthic producers of dissolved DMS/P than corals. An increase in DMS/P concentrations during periods of low carbonate saturation state may become ecologically important in the future under an OA regime, impacting larval settlement and increasing atmospheric emissions of DMS.
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影响因子：
2.6
作者：
DICKSON, AG
通讯作者：
DICKSON, AG
影响因子：
2.8
作者：
Broadbent, AD;Jones, GB;Jones, RJ
通讯作者：
Jones, RJ
影响因子：
2.4
作者：
Gagliano, Monica;McCormick, Mark I.;Depczynski, Martial
通讯作者：
Depczynski, Martial
影响因子：
3.6
作者：
Falter, James L.;Lowe, Ryan J.;Cuet, Pascale
通讯作者：
Cuet, Pascale
影响因子：
1.1
作者：
Burdett, Heidi L.;Aloisio, Elena;Kamenos, Nicholas A.
通讯作者：
Kamenos, Nicholas A.