Bacteriohopanepolyols along redox gradients in the Humboldt Current System off northern Chile
Bacteriohopanepolyols along redox gradients in the Humboldt Current System off northern Chile
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智利北部洪堡洋流系统中沿氧化还原梯度的细菌藿烷多元醇
DOI：
10.1111/gbi.12250
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
R. Summons
中科院分区：
文献类型：
--
作者：
E. Matys;Julio Sepúlveda;Silvio Pantoja;Carina B. Lange;M. Caniupán;Frank Lamy;R. Summons
海洋最低含氧量区（OMZs）的特点是存在地下缺氧或缺氧水域，其中不同的微生物过程负责去除固定氮。海洋保护区在过去几十年中不断扩大，预计将继续扩大，以应对不断变化的气候。对海洋生物地球化学，特别是氮循环的影响尚不确定。细胞膜脂质（生物标志物），如细菌细菌藿烷多元醇（BHPs）及其降解产物（类藿烷），具有独特的结构属性，可以传递有关其生物来源的信息。自从在古代沉积物中发现了hopanoids化石以来，BHPs的研究一直具有很大的生物地球化学兴趣，因为它们有可能作为地质记录中细菌的代用物。细菌藿烷醇（BHT）的一种立体异构体BHT II已经在OMZ水域中被发现，并且在厌氧氨氧化细菌的培养富集中被明确发现，厌氧氨氧化细菌是海洋OMZ中氮损失的关键群体。我们测试了BHT II作为智利北部洪堡洋流系统OMZ水域悬浮物中缺氧/厌氧和厌氧氨氧化细菌的代表，以及地表和深埋沉积物（125-150 ky）。BHT II比率（BHT II/总BHT）随着水体中氧含量的降低而增加，这与先前在Perú、Cariaco盆地和阿拉伯海的结果一致，也与微生物学证据一致，表明智利OMZ中厌氧氨氧化活性强烈。值得注意的是，BHT II从水柱输送到表层沉积物，并保存在深埋沉积物中，其中BHT II比值与冰期-间冰期过渡期间沉积物δ15N值的变化相关。该研究表明，BHT II通过地质记录提供了厌氧氨氧化相对重要性的过去变化和氮循环波动响应海洋氧化还原变化的代理。
Marine oxygen minimum zones (OMZs) are characterized by the presence of subsurface suboxic or anoxic waters where diverse microbial processes are responsible for the removal of fixed nitrogen. OMZs have expanded over past decades and are expected to continue expanding in response to the changing climate. The implications for marine biogeochemistry, particularly nitrogen cycling, are uncertain. Cell membrane lipids (biomarkers), such as bacterial bacteriohopanepolyols (BHPs) and their degradation products (hopanoids), have distinctive structural attributes that convey information about their biological sources. Since the discovery of fossil hopanoids in ancient sediments, the study of BHPs has been of great biogeochemical interest due to their potential to serve as proxies for bacteria in the geological record. A stereoisomer of bacteriohopanetetrol (BHT), BHT II, has been previously identified in OMZ waters and has as been unequivocally identified in culture enrichments of anammox bacteria, a key group contributing to nitrogen loss in marine OMZs. We tested BHT II as a proxy for suboxia/anoxia and anammox bacteria in suspended organic matter across OMZ waters of the Humboldt Current System off northern Chile, as well as in surface and deeply buried sediments (125–150 ky). The BHT II ratio (BHT II/total BHT) increases as oxygen content decreases through the water column, consistent with previous results from Perú, the Cariaco Basin and the Arabian Sea, and in line with microbiological evidence indicating intense anammox activity in the Chilean OMZ. Notably, BHT II is transported from the water column to surface sediments, and preserved in deeply buried sediments, where the BHT II ratio correlates with changes in δ15N sediment values during glacial–interglacial transitions. This study suggests that BHT II offers a proxy for past changes in the relative importance of anammox, and fluctuations in nitrogen cycling in response to ocean redox changes through the geological record.
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影响因子：
4.9
作者：
Berndmeyer, C.;Thiel, V.;Blumenberg, M.
通讯作者：
Blumenberg, M.
DOI：
10.1146/annurev-earth-050212-123958
发表时间：
2016-06
影响因子：
14.9
作者：
Dianne K. Newman;C. Neubauer;Jessica Ricci;Chia‐Hung Wu;A. Pearson
通讯作者：
Dianne K. Newman;C. Neubauer;Jessica Ricci;Chia‐Hung Wu;A. Pearson
影响因子：
4.9
作者：
Blumenberg, M.;Berndmeyer, C.;Thiel, V.
通讯作者：
Thiel, V.
DOI：
10.1073/pnas.1212141109
发表时间：
2012-08-28
影响因子：
11.1
作者：
Saenz, James Peter;Sezgin, Erdinc;Simons, Kai
通讯作者：
Simons, Kai
影响因子：
56.9
作者：
Stramma, Lothar;Johnson, Gregory C.;Mohrholz, Volker
通讯作者：
Mohrholz, Volker