DOI: 10.1016/j.palaeo.2012.10.022
论文题名: Response of chironomid assemblages to environmental change during the early Late-glacial at Gerzensee, Switzerland
作者: Brooks S.J. ; Heiri O.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 391 起始页码: 90
结束页码: 98
语种: 英语
英文关键词: Alps
; Chironomidae
; Climatic change
; Late-glacial
; Switzerland
英文摘要: Prior to ca. 14,660. yr BP, during the early Late-glacial (Oldest Dryas), larval assemblages of Chironomidae (Insecta: Diptera) in Gerzensee, Switzerland, were dominated by cold stenothermic taxa as well as by taxa typical of subalpine lakes today. This was the coldest period of the entire sequence. After ca. 14,660. yr BP, in the Late Glacial Interstadial (Bølling-Allerød), a temperature increase is recorded by a sharp rise in the oxygen-isotope ratio in lake marl and by an increase in the organic-matter content of the sediments. Changes in the chironomid fauna then are consistent with rising temperatures. This warming trend is interrupted between 14,070 and 13,940. yr BP, coinciding with the GI-1d cold oscillation, but the change in the chironomid assemblage is more consistent with a response to increasing lake depth and density of aquatic macrophytes than falling temperature. A rise in cold-adapted chironomid taxa between 13,840 and 13,710. yr BP suggests that summer air temperatures may have declined. Changes in the chironomid assemblage after 13,710. yr BP suggest a decline in submerged macrophytes coupled with a rise in lake productivity and summer temperature, although the latter is not reflected in the oxygen-isotope record. This suggests that there may have been increasing seasonality during this period when summer temperatures were rising, driven by rising summer insolation, and winters becoming cooler, which is largely reflected in the oxygen-isotope record. A decline in thermophilic chironomids and a rise in cold-adapted taxa after 13,180. yr BP suggest a response to cooling at the beginning of the Gerzensee Oscillation. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69568
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Entomology, Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland
Recommended Citation:
Brooks S.J.,Heiri O.. Response of chironomid assemblages to environmental change during the early Late-glacial at Gerzensee, Switzerland[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,391