Widespread occurrence of distinct alkenones from Group I haptophytes in freshwater lakes: Implications for paleotemperature and paleoenvironmental reconstructions

doi:10.1016/j.eps1.2018.04.002

	Widespread occurrence of distinct alkenones from Group I haptophytes in freshwater lakes: Implications for paleotemperature and paleoenvironmental reconstructions
	Shinozuka, Yoshitsugu 17; Jardillier, Ludwig 1; Toney, Jaime 5; Chu, Guoqiang 18; Liu, Zhonghui 4; Krivonogov, Sergey 2,3; Kolpakova, Marina 3; Longo, William M.8,15; Huang, Yongsong 8,9; Gotanda, Katsuya 10
刊名	EARTH AND PLANETARY SCIENCE LETTERS
	2018-06-15
卷号	492 期号:4 页码:239-250
关键词	Alkenones Paleoclimate Paleoenvironment Temperature Proxy Freshwater Lakes Chemotaxonomy
DOI	10.1016/j.eps1.2018.04.002
文献子类	Article
英文摘要	Alkenones are C35-C42 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 degrees C; mean annual precipitation range: 125-1657 mm yr(-1); latitude range: 40-81 degrees 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 RIK37 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 degrees N, 149.602 degrees W; lake E5, 68.643 degrees N, 149.458 degrees 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. (C) 2018 Elsevier B.V. All rights reserved.
WOS关键词	LONG-CHAIN-ALKENONES ; GROWTH TEMPERATURE ; EMILIANIA-HUXLEYI ; GEPHYROCAPSA-OCEANICA ; TIBETAN PLATEAU ; BALTIC SEA ; DISTRIBUTIONS ; LACUSTRINE ; SEDIMENTS ; SALINITY
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000432762000023
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/5128]
专题	地球环境研究所_加速器质谱中心
作者单位	1.Univ Paris 11, CNRS UMR 8079, Unite Ecol Systemat & Evolut, F-91405 Orsay, France 2.Novosibirsk State Univ, Novosibirsk 630090, Russia 3.RAS, SB, Inst Geol & Mineral, Novosibirsk 630090, Russia 4.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 5.Univ Glasgow, Dept Geog & Earth Sci, Glasgow, Lanark, Scotland 6.Friedrich Schiller Univ Jena, Inst Geog, D-07745 Jena, Germany 7.Marine Biol Lab, Ecosyst Ctr, 7 MBL St, Woods Hole, MA 02543 USA 8.Brown Univ, Dept Earth Environm & Planetary Sci, 324 Brook St, Providence, RI 02912 USA 9.Chinese Acad Sci, Inst Earth Environm, Beijing, Shaanxi, Peoples R China 10.Chiba Univ Commerce, Chiba 2728512, Japan
推荐引用方式 GB/T 7714	Shinozuka, Yoshitsugu,Jardillier, Ludwig,Toney, Jaime,et al. Widespread occurrence of distinct alkenones from Group I haptophytes in freshwater lakes: Implications for paleotemperature and paleoenvironmental reconstructions[J]. EARTH AND PLANETARY SCIENCE LETTERS,2018,492(4):239-250.
APA	Shinozuka, Yoshitsugu.,Jardillier, Ludwig.,Toney, Jaime.,Chu, Guoqiang.,Liu, Zhonghui.,...&Haberzettl, Torsten.(2018).Widespread occurrence of distinct alkenones from Group I haptophytes in freshwater lakes: Implications for paleotemperature and paleoenvironmental reconstructions.EARTH AND PLANETARY SCIENCE LETTERS,492(4),239-250.
MLA	Shinozuka, Yoshitsugu,et al."Widespread occurrence of distinct alkenones from Group I haptophytes in freshwater lakes: Implications for paleotemperature and paleoenvironmental reconstructions".EARTH AND PLANETARY SCIENCE LETTERS 492.4(2018):239-250.