DOI: 10.1016/j.palaeo.2012.10.021
论文题名: Response of subfossil cladocera in gerzensee (swiss plateau) to early late glacial environmental change
作者: Nováková K. ; Van Hardenbroek M. ; van der Knaap W.O.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 391 起始页码: 84
结束页码: 89
语种: 英语
英文关键词: Bølling
; Biotic response
; Cladocera
; Climatic change
; Late-glacial
; Palaeolimnology
; Switzerland
英文摘要: Sub-fossil Cladocera were studied in a core from Gerzensee (Swiss Plateau) for the late-glacial periods of Oldest Dryas, Bølling, and Allerød. Cladocera assemblages were dominated by cold-tolerant littoral taxa Chydorus sphaericus, Acroperus harpae, Alonella nana, Alona affinis, and Alonella excisa. The rapid warming at the beginning of the Bølling (GI-1e) ca. 14,650yr before present (BP: before AD 1950) was indicated by an abrupt 2‰ shift in carbonate δ18O and a clear change in pollen assemblages. Cladocera assemblages, in contrast, changed more gradually. C. sphaericus and A. harpae are the most cold-tolerant, and their abundance was highest in the earliest part of the record. Only 150-200years after the beginning of the Bølling warming we observed an increase in less cold-tolerant A. excisa and A. affinis. The establishment of Alona guttata, A. guttata var. tuberculata, and Pleuroxus unicatus was delayed by ca. 350, 770, and 800years respectively after the onset of the Bølling. The development of the Cladocera assemblages suggests increasing water temperatures during the Bølling/Allerød, which agrees with the interpretation by von Grafenstein et al. (2013-this issue) that decreasing δ18O values in carbonates in this period reflect increasing summer water temperatures at the sediment-water interface. Other processes also affected the Cladocera community, including the development and diversification of aquatic vegetation favourable for Cladocera. The record is clearly dominated by Chydoridae, as expected for a littoral core. Yet, the planktonic Eubosmina-group occurred throughout the core, with the exception of a period at ca. 13,760-13,420yr BP. Lake levels reconstructed for this period are relatively low, indicating that the littoral location might have become too shallow for Eubosmina in that period. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69582
Appears in Collections: 过去全球变化的重建
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作者单位: University of South Bohemia, Department of Botany, Branišovská 31, CZ-370 05 České Budějovice, Czech Republic; Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
Recommended Citation:
Nováková K.,Van Hardenbroek M.,van der Knaap W.O.. Response of subfossil cladocera in gerzensee (swiss plateau) to early late glacial environmental change[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,391