DOI: 10.1016/j.quascirev.2015.08.032
Scopus记录号: 2-s2.0-84941626004
论文题名: Climate controls on the Holocene development of a subarctic lake in northern Fennoscandia
作者: Rantala M.V. ; Luoto T.P. ; Weckström J. ; Perga M.-E. ; Rautio M. ; Nevalainen L.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 126 起始页码: 175
结束页码: 185
语种: 英语
英文关键词: Cladocera
; Diatoms
; Holocene climate
; Organic carbon
; Paleohydrology
; Stable isotopes
; Subarctic lakes
Scopus关键词: Aquatic organisms
; Biogeochemistry
; Biological materials
; Catchments
; Ecology
; Ecosystems
; Isotopes
; Light
; Organic carbon
; Organic compounds
; Runoff
; Social networking (online)
; Cladocera
; Diatoms
; Holocene climate
; Paleo-hydrology
; Stable isotopes
; Lakes
; crustacean
; diatom
; feeding behavior
; food web
; Holocene
; moisture content
; organic carbon
; paleoclimate
; paleohydrology
; photoautotrophy
; precipitation (climatology)
; sediment chemistry
; stable isotope
; subarctic region
; subfossil
; vertical mixing
; water column
; Fennoscandia
; Bacillariophyta
; Cladocera
; Crustacea
英文摘要: Climate exerts strong control over the functioning of northern freshwater ecosystems, yet their resilience and responses to climate forcing may vary. We examined postglacial development patterns in subarctic Lake Várddoaijávri to discern the impact of direct climate controls, catchment influence, and ontogenic processes on the ecological functioning of the lake over the Holocene. Subfossil diatom assemblages together with the elemental and stable isotopic (δ13C, δ15N) composition of sediment organic matter were used to examine climate-induced changes in the structure of the phototrophic community and transport of terrestrial organic matter from the catchment. Stable isotopic composition (δ13C, δ15N) of subfossil Cladocera (Crustacea) was further used to assess how the changes were reflected higher up the food web. The diatom assemblages and sediment geochemistry closely mirrored the established climate patterns of the Holocene, confirming the strong climate coupling evidenced by earlier studies from lakes across the circumpolar Arctic. Our record indicates overarching influence of moisture fluctuations, superimposing the impact of light limitation by terrestrial organic carbon and temperature-driven alterations to lake physical regimes, which have been emphasized by recent research. The millennial changes in humidity were reflected as shifting dominance between planktonic and benthic diatom life forms, related to changes in the depth of the water column, vertical mixing patterns, and underwater light conditions. Despite the marked regime shifts at the base of the food web, zooplankton carbon utilization was little changed over the Holocene, likely attributable to selective feeding strategies. Overall, our results propose that the projected increases in precipitation in high-latitude regions may have marked impact on the structure and functioning of aquatic communities in shallow subarctic lakes. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59812
Appears in Collections: 过去全球变化的重建
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作者单位: University of Helsinki, Department of Geosciences and Geography, P.O. Box 64 (Gustaf Hällströmin katu 2), Finland; University of Helsinki, Department of Environmental Sciences, Environmental Change Research Unit (ECRU), P.O. Box 65 (Viikinkaari 1), Finland; French National Institute for Agronomical Research (INRA), 75 Avenue de Corzent, BP 511, Thonon les Bains, France; Université du Québec à Chicoutimi, Département des Sciences Fondamentales, Centre for Northern Studies (CEN) and Groupe de Recherche Interuniversitaire en Limnologie (GRIL), 555 boulevard de l'Université ChicoutimiQC, Canada; University of Jyvaskyla, Department of Biological and Environmental Science, P.O. Box 35 (Survontie 9), Finland
Recommended Citation:
Rantala M.V.,Luoto T.P.,Weckström J.,et al. Climate controls on the Holocene development of a subarctic lake in northern Fennoscandia[J]. Quaternary Science Reviews,2015-01-01,126