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Lake Ecosystem Responses to Holocene Climate Change at the Subarctic Tree-Line in Northern Sweden

Reuss, Nina LU ; Hammarlund, Dan LU ; Rundgren, Mats LU ; Segerstrom, Ulf; Eriksson, Lars and Rosen, Peter (2010) In Ecosystems 13(3). p.393-409
Abstract
A Holocene sediment sequence from Lake Seukokjaure, a subarctic lake at tree-line in northern Sweden, was analyzed to assess major changes in the structure and functioning of the aquatic ecosystem in response to climate change and tree-line dynamics. The compiled multi-proxy data, including sedimentary pigments, diatoms, chironomids, pollen, biogenic silica (BSi), carbon (C), nitrogen (N) elemental and stable-isotope records, and total lake-water organic carbon (TOC) concentration inferred from near-infrared spectroscopy (NIRS), suggest that the Holocene development of Lake Seukokjaure was closely coupled to changes in terrestrial vegetation with associated soil development of the catchment, input of allochthonous organic carbon, and... (More)
A Holocene sediment sequence from Lake Seukokjaure, a subarctic lake at tree-line in northern Sweden, was analyzed to assess major changes in the structure and functioning of the aquatic ecosystem in response to climate change and tree-line dynamics. The compiled multi-proxy data, including sedimentary pigments, diatoms, chironomids, pollen, biogenic silica (BSi), carbon (C), nitrogen (N) elemental and stable-isotope records, and total lake-water organic carbon (TOC) concentration inferred from near-infrared spectroscopy (NIRS), suggest that the Holocene development of Lake Seukokjaure was closely coupled to changes in terrestrial vegetation with associated soil development of the catchment, input of allochthonous organic carbon, and changes in the light regime of the lake. A relatively productive state just after deglaciation around 9700 to 7800 cal years BP was followed by a slight long-term decrease in primary production. The onset of the local tree-line retreat around 3200 cal years BP was accompanied by more diverse and altered chironomid and diatom assemblages and indications of destabilized soils in the catchment by an increase in variability and absolute values of delta C-13. An abrupt drop in the C/N ratio around 1750 cal years BP was coupled to changes in the internal lake structure, in combination with changes in light and nutrient conditions, resulting in a shift in the phototrophic community from diatom dominance to increased influence of chlorophytes, likely dominated by an aquatic moss community. Thus, this study emphasizes the importance of indirect effects of climate change on tree-line lake ecosystems and complex interactions of in-lake processes during the Holocene. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
paleoecology, multi-proxy, pigments, stable, isotopes, NIRS, northern tree-line, aquatic ecosystems, microfossils, light, Holocene
in
Ecosystems
volume
13
issue
3
pages
393 - 409
publisher
Springer
external identifiers
  • wos:000277283600004
  • scopus:77951765126
ISSN
1432-9840
DOI
10.1007/s10021-010-9326-5
project
Climate Initiative
MERGE
BECC
language
English
LU publication?
yes
id
befe9d9e-e062-4529-9203-a03b91d0252e (old id 1618856)
date added to LUP
2010-06-18 14:05:37
date last changed
2018-05-29 09:18:56
@article{befe9d9e-e062-4529-9203-a03b91d0252e,
  abstract     = {A Holocene sediment sequence from Lake Seukokjaure, a subarctic lake at tree-line in northern Sweden, was analyzed to assess major changes in the structure and functioning of the aquatic ecosystem in response to climate change and tree-line dynamics. The compiled multi-proxy data, including sedimentary pigments, diatoms, chironomids, pollen, biogenic silica (BSi), carbon (C), nitrogen (N) elemental and stable-isotope records, and total lake-water organic carbon (TOC) concentration inferred from near-infrared spectroscopy (NIRS), suggest that the Holocene development of Lake Seukokjaure was closely coupled to changes in terrestrial vegetation with associated soil development of the catchment, input of allochthonous organic carbon, and changes in the light regime of the lake. A relatively productive state just after deglaciation around 9700 to 7800 cal years BP was followed by a slight long-term decrease in primary production. The onset of the local tree-line retreat around 3200 cal years BP was accompanied by more diverse and altered chironomid and diatom assemblages and indications of destabilized soils in the catchment by an increase in variability and absolute values of delta C-13. An abrupt drop in the C/N ratio around 1750 cal years BP was coupled to changes in the internal lake structure, in combination with changes in light and nutrient conditions, resulting in a shift in the phototrophic community from diatom dominance to increased influence of chlorophytes, likely dominated by an aquatic moss community. Thus, this study emphasizes the importance of indirect effects of climate change on tree-line lake ecosystems and complex interactions of in-lake processes during the Holocene.},
  author       = {Reuss, Nina and Hammarlund, Dan and Rundgren, Mats and Segerstrom, Ulf and Eriksson, Lars and Rosen, Peter},
  issn         = {1432-9840},
  keyword      = {paleoecology,multi-proxy,pigments,stable,isotopes,NIRS,northern tree-line,aquatic ecosystems,microfossils,light,Holocene},
  language     = {eng},
  number       = {3},
  pages        = {393--409},
  publisher    = {Springer},
  series       = {Ecosystems},
  title        = {Lake Ecosystem Responses to Holocene Climate Change at the Subarctic Tree-Line in Northern Sweden},
  url          = {http://dx.doi.org/10.1007/s10021-010-9326-5},
  volume       = {13},
  year         = {2010},
}