DOI: 10.1016/j.quascirev.2015.06.025
Scopus记录号: 2-s2.0-84936930001
论文题名: Enhanced algal abundance in northwest Ontario (Canada) lakes during the warmer early-to mid-Holocene period
作者: Karmakar M. ; Leavitt P.R. ; Cumming B.F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 123 起始页码: 168
结束页码: 179
语种: 英语
英文关键词: Algae
; Boreal lakes
; Cyanobacteria
; Holocene
; Multiproxy
; Northwest Ontario
; Phytoplankton
Scopus关键词: Algae
; Bacteria
; Eutrophication
; Forestry
; Phytoplankton
; Water levels
; Boreal lakes
; Cyanobacteria
; Holocenes
; Multi proxies
; Ontario
; Lakes
; abundance
; alga
; anoxia
; boreal forest
; chlorophyll
; community composition
; concentration (composition)
; cyanobacterium
; ecotone
; eutrophication
; headwater
; Holocene
; lacustrine environment
; phytoplankton
; prairie
; quantitative analysis
; regional pattern
; sediment core
; Bacteria
; Forests
; Lakes
; Pigment
; Canada
; Ontario [Canada]
; algae
; Bacillariophyta
; Cyanobacteria
英文摘要: This study investigates regional changes in primary producers in boreal head-water lakes during the warmer early-to-mid-Holocene (EMH) period, across the present-day boreal forest in northwest Ontario, a region that is adjacent to the prairie-forest ecotone. We quantified changes in algal abundance and composition over the Holocene period using pigments, spectrally-inferred chlorophyll a and diatom assemblages in well-dated sediment cores from three lakes. All three indicators showed a coherent pattern of enhanced primary producers in two of the study lakes (Gall Lake and Lake 239) during the EMH, whereas only diatom assemblages suggested higher levels of nutrients in Meekin Lake. Overall, this study supports a regional pattern of enhanced primary producers during the EMH, likely as a function of lower water-levels and warmer temperatures. Elevated concentrations of cyanobacterial pigments also occurred in two of the three lakes during the EMH, whereas pigments from purple-sulphur bacteria provide evidence of enhanced deep-water anoxia in one lake. These findings suggest that future climatic warming in boreal regions could include regional eutrophication and associated increases in cyanobacteria. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59858
Appears in Collections: 过去全球变化的重建
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作者单位: Paleoecological Environmental Assessment and Research Laboratory (PEARL), Department of Biology, Queen's University, Kingston, ON, Canada; Limnology Laboratory, Department of Biology, University of Regina, Laboratory BuildingSK, Canada
Recommended Citation:
Karmakar M.,Leavitt P.R.,Cumming B.F.. Enhanced algal abundance in northwest Ontario (Canada) lakes during the warmer early-to mid-Holocene period[J]. Quaternary Science Reviews,2015-01-01,123