Phosphonate cycling supports methane and ethylene supersaturation in the phosphate‐depleted western North Atlantic Ocean
Phosphonate cycling supports methane and ethylene supersaturation in the phosphate‐depleted western North Atlantic Ocean
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磷酸盐循环支持北大西洋西部磷酸盐耗尽的甲烷和乙烯过饱和
DOI：
10.1002/lno.11463
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发表时间：
2020
影响因子：
4.5
通讯作者：
Repeta, Daniel J.
中科院分区：
文献类型：
--
作者：
Sosa, Oscar A.;Burrell, Timothy J.;Wilson, Samuel T.;Foreman, Rhea K.;Karl, David M.;Repeta, Daniel J.
在营养贫乏的海洋区域，溶解有机磷(DOP)作为微生物磷(P)的来源发挥着重要作用。DOP的一个重要生物有效成分是磷酸盐，这是一种具有碳-磷(C-P)键的有机磷化合物，普遍存在于高分子量溶解有机物(HMWDOM)中。除了作为磷的来源外，细菌C-P裂解酶途径对磷酸盐的降解还会导致与气候和大气化学有关的微量烃类气体的释放。在这项研究中，我们研究了磷酸盐和磷酸盐循环在北大西洋西部甲烷(CH4)和乙烯(C2H4)生产中的作用，该地区的磷酸盐浓度从沿海水域过渡到开阔海域。我们观察到磷酸盐与水柱中CH4和C2H4的饱和状态以及磷酸盐与C-P裂解酶标记genephnJ的相对丰度之间呈负相关。在磷酸盐缺乏的水体中，甲基膦酸脂和2-羟乙基膦酸脂分别产生CH4和C2H4的C-P裂解酶底物很容易被降解，其比例与它们在HMWDOM中的丰度和生物有效性以及水柱中CH4和C2H4的浓度一致。我们的结论是，通过C-P裂解酶途径降解磷酸盐是北大西洋西部缺磷表层水域CH4和C2H4的重要来源和共同产生途径，并且磷酸盐浓度可能是控制这些气体在上层海洋中饱和状态的重要因素。
In oligotrophic ocean regions, dissolved organic phosphorus (DOP) plays a prominent role as a source of phosphorus (P) to microorganisms. An important bioavailable component of DOP is phosphonates, organophosphorus compounds with a carbon‐phosphorus (C‐P) bond, which are ubiquitous in high molecular weight dissolved organic matter (HMWDOM). In addition to being a source of P, the degradation of phosphonates by the bacterial C‐P lyase enzymatic pathway causes the release of trace hydrocarbon gases relevant to climate and atmospheric chemistry. In this study, we investigated the roles of phosphate and phosphonate cycling in the production of methane (CH4) and ethylene (C2H4) in the western North Atlantic Ocean, a region that features a transition in phosphate concentrations from coastal to open ocean waters. We observed an inverse relationship between phosphate and the saturation state of CH4and C2H4in the water column, and between phosphate and the relative abundance of the C‐P lyase marker genephnJ. In phosphate‐depleted waters, methylphosphonate and 2‐hydroxyethylphosphonate, the C‐P lyase substrates that yield CH4and C2H4, respectively, were readily degraded in proportions consistent with their abundance and bioavailability in HMWDOM and with the concentrations of CH4and C2H4in the water column. We conclude that phosphonate degradation through the C‐P lyase pathway is an important source and a common production pathway of CH4and C2H4in the phosphate‐depleted surface waters of the western North Atlantic Ocean and that phosphate concentration can be an important control on the saturation state of these gases in the upper ocean.
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影响因子：
48
作者：
Langmead, Ben;Salzberg, Steven L.
通讯作者：
Salzberg, Steven L.
影响因子：
5.1
作者：
Sosa, Oscar A.;Repeta, Daniel J.;Karl, David M.
通讯作者：
Karl, David M.
影响因子：
4.5
作者：
Thomson-Bulldis, A;Karl, D
通讯作者：
Karl, D
海水中的产甲烷菌
DOI：
--
发表时间：
1993
期刊：
影响因子：
--
作者：
D. Marty
通讯作者：
D. Marty
影响因子：
5.2
作者：
Sosa OA;Repeta DJ;Ferrón S;Bryant JA;Mende DR;Karl DM;DeLong EF
通讯作者：
DeLong EF