Hydroxylated isoprenoidal GDGTs in the Nordic Seas

Susanne Fietz; Carme Huguet; Gemma Rueda; Bastian Hambach; Antoni Rosell-Mele

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Hydroxylated isoprenoidal GDGTs in the Nordic Seas

机译：北欧海洋中的羟基化类异戊二烯GDGTs

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Archaea modify their membrane lipid composition to maintain integrity and exchange capabilities across a wide temperature range. The number of rings in the tetraether structure increases with higher ambient temperatures. Recently, novel glycerol dialkyl glycerol tetraethers (GDGTs) with an additional hydroxyl group on the alkyl chain were described (OH-GDGTs). Here we show that at a regional scale in the Nordic Seas (western Barents, Norwegian, Greenland, and Iceland Seas), the OH-GDGTs1 contribution to the total archaeal GDGT pool as well as the ratio of specific OH-GDGTs versus crenarchaeol are higher in colder waters, especially in polar water masses. We also observe a shift in the number of rings of the OH-GDGTs with temperature. Thus, both the contribution of the OH-GDGTs to the total isoprenoidal GDGT pool and the number of rings in OH-GDGTs could be used as potential indicators of polar waters and might complement the currently used paleo sea surface temperature proxies in polar regions.

机译：古细菌改变其膜脂质组成，以在较宽的温度范围内保持完整性和交换能力。四醚结构中的环数随着环境温度的升高而增加。最近，描述了在烷基链上具有另外的羟基的新型甘油二烷基甘油四醚（GDGT）（OH-GDGT）。在这里，我们表明，在北欧海域（西部巴伦支，挪威，格陵兰和冰岛海）的区域范围内，OH-GDGTs1对总古细菌GDGT库的贡献以及特定的OH-GDGTs与Crenarchaeol的比例更高在较冷的水域中，尤其是在极地水域中。我们还观察到了OH-GDGTs的环数随温度的变化。因此，OH-GDGT对总类异戊二烯GDGT的贡献和OH-GDGT中环的数量都可以用作极地水的潜在指标，并且可以补充极地地区当前使用的古海表温度代理。

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来源
《Marine Chemistry》 |2013年第20期|1-10|共10页
作者
Susanne Fietz; Carme Huguet; Gemma Rueda; Bastian Hambach; Antoni Rosell-Mele;
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作者单位

Institut de Ciencia i Tecnologia Ambientals, Universitat Autónoma de Barcelona, Bellaterra, Spain,Department of Earth Sciences, Stellenbosch University, South Africa;

Institut de Ciencia i Tecnologia Ambientals, Universitat Autónoma de Barcelona, Bellaterra, Spain;

Institut de Ciencia i Tecnologia Ambientals, Universitat Autónoma de Barcelona, Bellaterra, Spain;

Institut de Ciencia i Tecnologia Ambientals, Universitat Autónoma de Barcelona, Bellaterra, Spain;

Institut de Ciencia i Tecnologia Ambientals, Universitat Autónoma de Barcelona, Bellaterra, Spain,Institucio Catalana de Recerca i Estudis Avancats (ICREA), Barcelona, Spain;

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正文语种 eng
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关键词
Arctic; Biomarkers; Crenarchaeota; Fram Strait; Isoprenoidal GDCT; OH-GDGT; Polar waters; TEX_(86)Sea surface temperature; Thaumarchaeota;

机译：北极;生物标志物;Crenarchaeota;弗拉姆海峡;异戊二烯GDCT;OH-GDGT;极地水域;TEX_（86）海面温度;Thaumarchaeota;

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Hydroxylated isoprenoidal GDGTs in the Nordic Seas

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