DOI: 10.1016/j.quascirev.2014.07.009
Scopus记录号: 2-s2.0-84909579815
论文题名: Alkenone distribution in Lake Van sediment over the last 270ka: Influence of temperature and haptophyte species composition
作者: Randlett M.-E. ; Coolen M.J.L. ; Stockhecke M. ; Pickarski N. ; Litt T. ; Balkema C. ; Kwiecien O. ; Tomonaga Y. ; Wehrli B. ; Schubert C.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 104 起始页码: 53
结束页码: 62
语种: 英语
英文关键词: Alkenone paleothermometry
; Biomarker
; Haptophyte species
; Lake Van
; Paleolimnology
; Paleoproxy
Scopus关键词: Paleolimnology
; Alkenones
; Haptophyte species
; Lake vans
; Paleoproxy
; Species composition
; Biomarkers
; alga
; alkenone
; biomarker
; fossil record
; lacustrine deposit
; paleolimnology
; paleotemperature
; reconstruction
; spatial distribution
; temperature effect
; Lake Van
; Turkey
英文摘要: Fossil long-chain alkenones have been used for several decades to reconstruct past ocean surface water temperatures and gained recent interest as a paleotemperature proxy for continental lake settings. However, factors besides temperature can affect alkenone distributions in haptophyte algae, and alkenone compositions can differ between haptophyte species. Alkenone-biosynthesizing haptophyte algae are genetically much more diverse in lakes than in the marine realm, and species-level variations in alkenone compositions could have implications for alkenone paleothermometry. Here, we performed a paired analysis of alkenone distributions and haptophyte species compositions using ancient DNA in up to 270ka-old sediments of Lake Van in Turkey to reveal a possible species-effect on fossil alkenone distributions and paleotemperature estimates. The same predominant haptophyte in Lake Van today prevailed also since the last ~100ka. However, a calibration of alkenone paleotemperature especially in the oldest analyzed intervals is complicated due to a more complex haptophyte species composition predominated by a haptophyte (LVHap_6), which is phylogenetically different from sequences recovered from currently existing lakes including Lake Van and from haptophyte species existing in culture. The predominance of LVHap_6 coincided with the presence of alkenone MeC38:3 and relatively high MeC37:3/4 (2.4) and MeC38:4/5 ratios (3.0). Uk37 index values in the sediment core over the last 270ka reflect relative changes in past temperature and are additionally linked to haptophyte species composition. A sustained period of high salinity, as indicated by pore-water salinity measurements, could potentially have triggered the succession of haptophytes as sources of alkenones in Lake Van. © 2014 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60131
Appears in Collections: 过去全球变化的重建
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作者单位: Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Surface Waters - Research and Management, Kastanienbaum, Switzerland; ETH Zurich, Institute of Biogeochemistry and Pollutant Dynamics, Zurich, Switzerland; WHOI Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry Department, Woods Hole, MA, United States; Eawag, Department of Surface Water - Research and Management, Dübendorf, Switzerland; University of Bonn, Steinmann Institute of Geology, Mineralogy and Paleontology, Bonn, Germany; Eawag, Water Resources and Drinking Water, Dübendorf, Switzerland
Recommended Citation:
Randlett M.-E.,Coolen M.J.L.,Stockhecke M.,et al. Alkenone distribution in Lake Van sediment over the last 270ka: Influence of temperature and haptophyte species composition[J]. Quaternary Science Reviews,2014-01-01,104