DOI: 10.1007/s10533-016-0203-y
Scopus记录号: 2-s2.0-84961994233
论文题名: Biogeochemical shifts in hydrologically divergent taiga lakes in response to late Holocene climate fluctuations
作者: Nevalainen L. ; Kivilä E.H. ; Luoto T.P.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 128, 期: 2018-01-02 起始页码: 201
结束页码: 215
语种: 英语
英文关键词: Cladocera
; Climate change
; Ontogeny
; Paleolimnology
; Scandinavia
; Stable isotopes
Scopus关键词: anoxic conditions
; biogeochemistry
; carbon isotope
; climate change
; crustacean
; food web
; functional group
; ice cover
; isotopic composition
; lacustrine environment
; Little Ice Age
; Medieval Warm Period
; Neoglacial
; nitrogen isotope
; ontogeny
; paleolimnology
; sediment core
; stable isotope
; stratification
; twentieth century
; zooplankton
; Scandinavia
; Chironomidae
; Cladocera
; Daphnia
英文摘要: We examined functional climate responses of two small taiga lakes in eastern Scandinavia with the aim to compare biogeochemical shifts in the hydrologically different basins over the past 3500 years. Sediment cores from one seepage and one drainage lake were studied for C and N elemental and stable isotopic composition to track organic matter origin, elemental cycles, and trophic structure. Fossil Cladocera assemblages and functional grouping of Chironomidae were determined to understand food web structure, biotic interactions, and habitat quality. In the seepage lake, the warm Medieval Climate Anomaly (MCA, ~1400 to 1000 cal BP) induced thermal stratification, hypolimnetic anoxia, and increased in-lake production, similar to the 20th century development. The Neoglacial cooling, with a high precipitation period at ~2200 to 2000 cal BP, and the cold Little Ice Age (LIA, ~700 to 300 cal BP) increased terrestrial carbon inputs and reduced productivity. The drainage lake was shallow, productive, and humic during the warm and dry period at ~4000 to 3000 cal BP but cooler and moister climate induced higher lake level with stratification and hypolimnetic anoxia around 2500 cal BP. The MCA was characterized by increased in-lake production and altered food web structure, as the keystone zooplankton taxon Daphnia was extirpated, and LIA by intensified anoxia and reduced planktonic production due to longer ice-cover period. Coherent responses to climate warming included increased planktonic production, stronger stratification, and hypolimnetic anoxia with anaerobic processes in both lakes, but responses to moisture were site-specific and dependent on basin hydromorphology. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83406
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Biological and Environmental Science, University of Jyvaskylä, P.O. Box 35, Jyvaskylä, Finland; Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, Helsinki, Finland
Recommended Citation:
Nevalainen L.,Kivilä E.H.,Luoto T.P.. Biogeochemical shifts in hydrologically divergent taiga lakes in response to late Holocene climate fluctuations[J]. Biogeochemistry,2016-01-01,128(2018-01-02)