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

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

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 sediment...

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Veröffentlicht in:Ecosystems. - Springer Science + Business Media. - 13(2010), 3, Seite 393-409
1. Verfasser: Reuss, Nina S. (VerfasserIn)
Weitere Verfasser: Hammarhmd, Dan, Rundgren, Mats, Segerström, Ulf, Eriksson, Lars, Rosén, Peter
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2010
Zugriff auf das übergeordnete Werk:Ecosystems
Schlagworte:Physical sciences Applied sciences Biological sciences Environmental studies
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520 |a 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 stableisotope 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 déglaciation 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 γ¹³C. 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. 
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700 1 |a Rosén, Peter  |e verfasserin  |4 aut 
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