globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.04.002
Scopus记录号: 2-s2.0-85045568651
论文题名:
Widespread occurrence of distinct alkenones from Group I haptophytes in freshwater lakes: Implications for paleotemperature and paleoenvironmental reconstructions
作者: Longo W.M.; Huang Y.; Yao Y.; Zhao J.; Giblin A.E.; Wang X.; Zech R.; Haberzettl T.; Jardillier L.; Toney J.; Liu Z.; Krivonogov S.; Kolpakova M.; Chu G.; D'Andrea W.J.; Harada N.; Nagashima K.; Sato M.; Yonenobu H.; Yamada K.; Gotanda K.; Shinozuka Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 492
起始页码: 239
结束页码: 250
语种: 英语
英文关键词: alkenones ; chemotaxonomy ; freshwater lakes ; paleoclimate ; paleoenvironment ; temperature proxy
Scopus关键词: Atmospheric temperature ; Biochemistry ; Climate change ; Ketones ; Mixing ; Oceanography ; Population distribution ; Suspended sediments ; Water ; Alkenones ; chemotaxonomy ; Fresh water lakes ; Paleo-environment ; Paleoclimates ; Temperature proxy ; Lakes ; alga ; alkenone ; lake water ; lipid ; paleoclimate ; paleoenvironment ; reconstruction ; sea surface temperature ; algae ; Haptophyceae
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 °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 RIK37 index. Additionally, we observed significant correlations of alkenone unsaturation (U37 K) with seasonal and mean annual air temperature with this expanded freshwater lakes dataset, with the strongest correlation occurring during the spring transitional season (U37 K=0.029⁎T−0.49; r2=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. © 2018 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109885
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Earth, Environmental and Planetary Sciences, Brown University, 324 Brook St., Providence, RI 02912, United States; Institute of Earth Environment, Chinese Academy of Sciences, Shaanxi, China; The Ecosystems Center, Marine Biological Laboratory, 7 MBL St., Woods Hole, MA 02543, United States; Institute of Geography, Friedrich-Schiller-University Jena, Jena, 07745, Germany; Unité d'Ecologie, Systématique et Evolution, CNRS UMR 8079, Université Paris-Sud, Orsay, 91405, France; Department of Geographical and Earth Sciences, University of GlasgowScotland, United Kingdom; Department of Earth Sciences, The University of Hong Kong, Hong Kong; Institute of Geology and Mineralogy SB RAS, Novosibirsk, 630090, Russian Federation; Novosibirsk State University, Novosibirsk, 630090, Russian Federation; Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, Palisades, NY 10964, United States; Japan Agency for Marine-Earth Science and Technology, Yokosuka, 237-0061, Japan; College of Education, Naruto University of Education, Naruto, 772-8502, Japan; Museum of Natural and Environmental History, Shizuoka, 422-8017, Japan; Chiba University of Commerce, Chiba, 272-8512, Japan; Ritsumeikan University, Kyoto, 603-8577, Japan; Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, 266 Woods Hole Rd., Woods Hole, MA 02543, United States

Recommended Citation:
Longo W.M.,Huang Y.,Yao Y.,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,2018-01-01,492
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