Diatom responses to limnological and climatic changes at Ribains maar (French Massif Central) during the Eemian and early Wurm

doi:10.1016/j.quascirev.2007.03.009

	Diatom responses to limnological and climatic changes at Ribains maar (French Massif Central) during the Eemian and early Wurm
	Rioual, Patrick ; Andrieu-Ponel, Valerie ; de Beaulieu, Jacques-Louis ; Reille, Maurice ; Svobodova, Helena ; Battarbee, Richard W.
刊名	QUATERNARY SCIENCE REVIEWS
	2007-06-01
卷号	26 期号:11-12 页码:1557-1609
ISSN号	0277-3791
DOI	10.1016/j.quascirev.2007.03.009
文献子类	Review
英文摘要	High-resolution diatom analysis was carried out to assess the limnological and climatic changes that took place at Ribains maar (French Massif Central) during the Late Pleistocene (similar to 131-similar to 105 ka BP), with a focus on the Eemian interglacial in particular. Numerical analyses were used to show that most of the variability in the fossil diatom assemblages was due to climate independently from the changes in the lake catchment vegetation (as represented by pollen data). Diatom-based quantitative reconstructions of the past limnological conditions, as well as a comprehensive literature review on the auto-ecological requirements for the principal diatom taxa, were used to interpret the record. An absolute time-scale for the sequence was derived by matching the major pollen shifts with the radiometrically dated changes in oxygen isotopes observed in Italian stalagmites. This study shows that at Ribains maar, the transition from the Riss (= Saalian) Glacial to the Eemian interglacial was marked by a gradual increase in the contribution of spring-blooming diatom species, indicating a longer growing season and milder winter/spring conditions Lit that time. A short cooling event interrupts this trend and may correspond to a stadial. At the start of the Eemian a peak in benthic taxa and the suppression of spring-blooming flora probably reflects the effects of deglaciation on the catchment. During the Eemian interglacial itself three main phases were distinguished within the diatom record. The first phase (similar to 8000 years in duration) was dominated by Stephanodiscus minutulus, which suggests that intense mixing in the water-column took place during spring. The pollen record was simultaneously dominated by Quercus and Corylus that typify this phase as the climatic optimum of the Eemian. The second phase, almost equal in duration to the first phase (similar to 7000 years), is generally dominated by Cyclotella taxa and suggests a less productive lake and much reduced period of spring mixing compared with the first phase. In the pollen diagram this corresponds to an interval dominated by Carpinus-Picea-Abies that indicates a cooler and wetter climate. The third and last phase of the Eemian, similar to 2000 year long, saw the return to Stephanodiscus-dominated assemblages, indicating a warming that may correspond to the Dansgaard-Oeschger event 25 identified in the Greenland ice-core record. In the early stage of the Wurm Glacial (= Weichselian), assemblages in the Melisey I stadial (similar to 3000 year long) were dominated by either Aulacoseira subarctica or Asterionella formosa, which Suggest colder spring conditions than during the late Eemian, but not as cold as the ones indicated by the pollen record. Stephanodiscus spp. again dominate during the Saint-Germain Ia interstadial (similar to 5000 year long) suggesting a return to the conditions that prevailed before the Melisey stadial, in agreement with the pollen record. The record ends with the Montaigu cold event, which is characterised by a. Pinus peak in the pollen record, and corresponds to a large abundance of A. subarctica in the diatom sequence. Throughout the Eemian the abundance of Stephanodiscus spp., which is thought to be driven by winter conditions, show cyclic fluctuations that most likely match the cooling events identified in a pollen record from Germany. Variation in insolation throughout the Eemian may have been the driving factor behind the species succession observed in the diatom sequence.
WOS关键词	CYCLOTELLA-OCELLATA BACILLARIOPHYCEAE ; ANNUALLY LAMINATED SEDIMENT ; PAST ENVIRONMENTAL-CONDITIONS ; CHRYSOPHYTE CYST ASSEMBLAGES ; LAST INTERGLACIAL CONDITIONS ; ABRUPT TEMPERATURE-CHANGES ; BIOGENIC SILICA RECORD ; HIGH-RESOLUTION RECORD ; ISOTOPE SUBSTAGE 5E ; LAKE BAIKAL
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000248349700006
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67598]
专题	中国科学院地质与地球物理研究所
通讯作者	Rioual, Patrick
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Inst Mediterraneen Ecol & Paleocol, CNRS 6116, F-13545 Aix En Provence 04, France 3.Inst Bot, CZ-25243 Prague, Czech Republic 4.UCL, Environm Change Res Ctr, London WC1H 0AP, England
推荐引用方式 GB/T 7714	Rioual, Patrick,Andrieu-Ponel, Valerie,de Beaulieu, Jacques-Louis,et al. Diatom responses to limnological and climatic changes at Ribains maar (French Massif Central) during the Eemian and early Wurm[J]. QUATERNARY SCIENCE REVIEWS,2007,26(11-12):1557-1609.
APA	Rioual, Patrick,Andrieu-Ponel, Valerie,de Beaulieu, Jacques-Louis,Reille, Maurice,Svobodova, Helena,&Battarbee, Richard W..(2007).Diatom responses to limnological and climatic changes at Ribains maar (French Massif Central) during the Eemian and early Wurm.QUATERNARY SCIENCE REVIEWS,26(11-12),1557-1609.
MLA	Rioual, Patrick,et al."Diatom responses to limnological and climatic changes at Ribains maar (French Massif Central) during the Eemian and early Wurm".QUATERNARY SCIENCE REVIEWS 26.11-12(2007):1557-1609.