Widespread occurrence of distinct alkenones from Group I haptophytes in freshwater lakes: Implications for paleotemperature and paleoenvironmental reconstructions
Widespread occurrence of distinct alkenones from Group I haptophytes in freshwater lakes: Implications for paleotemperature and paleoenvironmental reconstructions
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淡水湖泊中 I 类触生植物中广泛存在的不同烯酮：对古温度和古环境重建的影响
DOI：
10.1016/j.eps1.2018.04.002
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发表时间：
2018-06
影响因子：
5.3
通讯作者：
Sato Miyako
中科院分区：
文献类型：
--
作者：
Longo William M;Huang Yongsong;Yao Yuan;Zhao Jiaju;Giblin Anne E;Wang Xian;Zech Rol;Haberzettl Torsten;Jardillier Ludwig;Toney Jaime;Liu Zhonghui;Krivonogov Sergey;Kolpakova Marina;Chu Guoqiang;D'Andrea William J;Harada Naomi;Nagashima Kana;Sato Miyako
烯酮是C35-C42多不饱和酮脂质，通常用于重建海洋表面温度的变化。然而，它们在近海和盐湖中的使用可能受到物种混合效应的阻碍。我们最近假设，淡水湖泊是免疫物种混合效应，因为它们似乎专门主机组I haptophyte藻类，产生一个独特的分布的烯酮与烯酮不饱和度的温度相对一致的反应。为了评估这一假设，并探讨地理范围的第一组附着植物，我们分析了烯酮沉积物和悬浮颗粒物样品分布在整个中高纬度地区的北方半球（n= 30）的湖泊。我们的研究结果表明，I类烯酮分布广泛存在于不同气候条件下的淡水湖泊中（年平均气温范围：− 17.3-10.9° C;年平均降水量范围：125-1657 mm/年;纬度范围：40-81° N），通常存在于中性至碱性湖泊（pH> 7.0），包括火山湖和具有镁铁质基岩的湖泊。我们发现，这些淡水湖泊不具有烯酮分布特征的第二组湖泊附着植物，提供支持的假设，即淡水湖泊是免疫物种混合效应。在湖泊中，经历了时间变化的盐度，我们观察到混合组I/II烯酮分布和烯酮的贡献，从每个组可以量化与RIK 37指数。此外，我们观察到烯酮不饱和度（U 37 K）与季节和年平均气温的显着相关性与这个扩展的淡水湖数据集，最强的相关性发生在春季过渡季节（U 37 K= 0.029 <$T-0.49; r 2= 0.60; p< 0.0001）。我们提出了新的沉积物收集器数据，从两个湖泊在阿拉斯加北方（图里克湖，68.632° N，149.602° W;湖E5，68.643° N，149.458° W），证明了最高的沉积通量的烯酮在春季过渡季节，同时与湖冰融化和等温混合的时期。总之，这些数据提供了一个框架，用于评估湖泊烯酮分布和利用烯酮不饱和度作为湖泊温度代理。
Alkenones are C 35–C 42 polyunsaturated ketone lipids that are commonly employed to reconstruct changes in sea surface temperature. However, their use in coastal seas and saline lakes can be hindered by species-mixing effects. We recently hypothesized that freshwater lakes are immune to species-mixing effects because they appear to exclusively host Group I haptophyte algae, which produce a distinct distribution of alkenones with a relatively consistent response of alkenone unsaturation to temperature. To evaluate this hypothesis and explore the geographic extent of Group I haptophytes, we analyzed alkenones in sediment and suspended particulate matter samples from lakes distributed throughout the mid-and high latitudes of the Northern Hemisphere (n= 30). Our results indicate that Group I-type alkenone distributions are widespread in freshwater lakes from a range of different climates (mean annual air temperature range:− 17.3–10.9° C; mean annual precipitation range: 125–1657 mm yr− 1; latitude range: 40–81° N), and are commonly found in neutral to basic lakes (pH> 7.0), including volcanic lakes and lakes with mafic bedrock. We show that these freshwater lakes do not feature alkenone distributions characteristic of Group II lacustrine haptophytes, providing support for the hypothesis that freshwater lakes are immune to species-mixing effects. In lakes that underwent temporal shifts in salinity, we observed mixed Group I/II alkenone distributions and the alkenone contributions from each group could be quantified with the RIK 37 index. Additionally, we observed significant correlations of alkenone unsaturation (U 37 K) with seasonal and mean annual air temperature with this expanded freshwater lakes dataset, with the strongest correlation occurring during the spring transitional season (U 37 K= 0.029⁎ T− 0.49; r 2= 0.60; p< 0.0001). We present new sediment trap data from two lakes in northern Alaska (Toolik Lake, 68.632° N, 149.602° W; Lake E5, 68.643° N, 149.458° W) that demonstrate the highest sedimentary fluxes of alkenones in the spring transitional season, concurrent with the period of lake ice melt and isothermal mixing. Together, these data provide a framework for evaluating lacustrine alkenone distributions and utilizing alkenone unsaturation as a lake temperature proxy.
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影响因子：
5
作者：
J. Toney;Y. Huang;S. Fritz;P. A. Baker;E. Grimm;P. Nyren
通讯作者：
J. Toney;Y. Huang;S. Fritz;P. A. Baker;E. Grimm;P. Nyren
影响因子：
3
作者：
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影响因子：
5
作者：
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W. Longo;S. Theroux;A. Giblin;Yinsui Zheng;J. T. Dillon;Yongsong Huang
影响因子：
3
作者：
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通讯作者：
Yinsui Zheng;R. Tarozo;Yongsong Huang
影响因子：
3.7
作者：
D'Andrea, William J.;Lage, Melissa;Huang, Yongsong
通讯作者：
Huang, Yongsong