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Development and application of sedimentary pigments for assessing effects of climatic and environmental changes on subarctic lakes in northern Sweden

Reuss, Nina LU ; Leavitt, Peter R.; Hall, Roland I.; Bigler, Christian and Hammarlund, Dan LU (2010) In Journal of Paleolimnology 43(1). p.149-169
Abstract
A surface-sediment survey of pigments in 100 lakes in the Scandes Mountains, northern Sweden, was combined with a reconstruction of Holocene sedimentary pigments from Lake Seukokjaure to assess the major factors regulating phototrophic communities, and how these controls may have changed during the period from the deglaciation (similar to 9700 cal. years BP) to the present. The study area covers a pronounced gradient of temperature and precipitation, and encompasses the subarctic tree line, an important ecotonal boundary in this region. Lake Seukokjaure is located in a presently treeless basin close to the modern tree line. The spatial survey of sedimentary pigments was analyzed using principle components analysis (PCA) and redundancy... (More)
A surface-sediment survey of pigments in 100 lakes in the Scandes Mountains, northern Sweden, was combined with a reconstruction of Holocene sedimentary pigments from Lake Seukokjaure to assess the major factors regulating phototrophic communities, and how these controls may have changed during the period from the deglaciation (similar to 9700 cal. years BP) to the present. The study area covers a pronounced gradient of temperature and precipitation, and encompasses the subarctic tree line, an important ecotonal boundary in this region. Lake Seukokjaure is located in a presently treeless basin close to the modern tree line. The spatial survey of sedimentary pigments was analyzed using principle components analysis (PCA) and redundancy analysis (RDA). PCA explained 73-83% of variance in pigment abundance and composition, whereas RDA explained 22-32% of variation in fossil assemblages. Dissolved organic carbon (DOC) content of lake water, sediment delta C-13, maximum lake depth, elevation and lake-water conductivity were all identified as environmental variables with significant association with pigment abundances in the spatial survey, although phototrophic communities of lakes situated in different vegetation zones (alpine, birch, conifer/birch) were incompletely distinguished by the ordinations. In the RDAs, the primary pigment variability occurred along a production gradient that was correlated negatively to water-column DOC content and delta C-13 signature of sediments. This pattern suggested that the important controls of primary production were light regime and terrestrial supplies of C-13-depleted carbon. In contrast, depth, elevation and conductivity were found to be more important for the differentiation of the phototrophic community composition. Application of these spatial survey results to the Holocene sediment record of Lake Seukokjaure demonstrated the importance of DOC for the temporal development of the lake, from an early state of high production to a period of slight oligotrophication. In general, the algal changes were regulated by the interaction of DOC and conductivity, although transitions in the phototrophic community during the late Holocene were less easily interpreted. Terrestrial vegetation development thus appears to be of utmost importance for the regulation of primary production in oligotrophic alpine and subarctic lakes and climate impacts on lakes, whereas other basin-specific factors may control the ontogeny of algal community composition. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Abisko, HPLC, DOC, Climate, Pigments, Phototrophic community
in
Journal of Paleolimnology
volume
43
issue
1
pages
149 - 169
publisher
Springer
external identifiers
  • wos:000273162900011
  • scopus:77949775218
ISSN
0921-2728
DOI
10.1007/s10933-009-9323-x
project
BECC
language
English
LU publication?
yes
id
bc148a00-292b-4f23-9fec-d35690b8dc1d (old id 1533642)
date added to LUP
2010-01-27 15:31:19
date last changed
2018-07-15 04:02:06
@article{bc148a00-292b-4f23-9fec-d35690b8dc1d,
  abstract     = {A surface-sediment survey of pigments in 100 lakes in the Scandes Mountains, northern Sweden, was combined with a reconstruction of Holocene sedimentary pigments from Lake Seukokjaure to assess the major factors regulating phototrophic communities, and how these controls may have changed during the period from the deglaciation (similar to 9700 cal. years BP) to the present. The study area covers a pronounced gradient of temperature and precipitation, and encompasses the subarctic tree line, an important ecotonal boundary in this region. Lake Seukokjaure is located in a presently treeless basin close to the modern tree line. The spatial survey of sedimentary pigments was analyzed using principle components analysis (PCA) and redundancy analysis (RDA). PCA explained 73-83% of variance in pigment abundance and composition, whereas RDA explained 22-32% of variation in fossil assemblages. Dissolved organic carbon (DOC) content of lake water, sediment delta C-13, maximum lake depth, elevation and lake-water conductivity were all identified as environmental variables with significant association with pigment abundances in the spatial survey, although phototrophic communities of lakes situated in different vegetation zones (alpine, birch, conifer/birch) were incompletely distinguished by the ordinations. In the RDAs, the primary pigment variability occurred along a production gradient that was correlated negatively to water-column DOC content and delta C-13 signature of sediments. This pattern suggested that the important controls of primary production were light regime and terrestrial supplies of C-13-depleted carbon. In contrast, depth, elevation and conductivity were found to be more important for the differentiation of the phototrophic community composition. Application of these spatial survey results to the Holocene sediment record of Lake Seukokjaure demonstrated the importance of DOC for the temporal development of the lake, from an early state of high production to a period of slight oligotrophication. In general, the algal changes were regulated by the interaction of DOC and conductivity, although transitions in the phototrophic community during the late Holocene were less easily interpreted. Terrestrial vegetation development thus appears to be of utmost importance for the regulation of primary production in oligotrophic alpine and subarctic lakes and climate impacts on lakes, whereas other basin-specific factors may control the ontogeny of algal community composition.},
  author       = {Reuss, Nina and Leavitt, Peter R. and Hall, Roland I. and Bigler, Christian and Hammarlund, Dan},
  issn         = {0921-2728},
  keyword      = {Abisko,HPLC,DOC,Climate,Pigments,Phototrophic community},
  language     = {eng},
  number       = {1},
  pages        = {149--169},
  publisher    = {Springer},
  series       = {Journal of Paleolimnology},
  title        = {Development and application of sedimentary pigments for assessing effects of climatic and environmental changes on subarctic lakes in northern Sweden},
  url          = {http://dx.doi.org/10.1007/s10933-009-9323-x},
  volume       = {43},
  year         = {2010},
}