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Global change and a...
Global change and arctic ecosystems : is lichen decline a function of increases in vascular plant biomass?
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- Cornelissen, C (author)
- Vrije Univ Amsterdam
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Callaghan, V (author)
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- Alatalo, Juha, 1966- (author)
- Göteborgs Universitet
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Michelsen, A (author)
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Graglia, E (author)
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Hartley, E (author)
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Hik, S (author)
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Hobbie, E (author)
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Press, C (author)
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Robinson, H (author)
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Henry, R (author)
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Shaver, R (author)
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Phoenix, K (author)
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Jones, G (author)
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Jonasson, S (author)
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Chapin, S (author)
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Molau, U (author)
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Neill, C (author)
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Lee, A (author)
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Melillo, M (author)
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Sveinbjornsson, B (author)
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Aerts, R (author)
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(creator_code:org_t)
- 2004-01-23
- 2001
- English.
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In: Journal of Ecology. - : Wiley. - 0022-0477 .- 1365-2745. ; 89:6, s. 984-994
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
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- 1 Macrolichens are important for the functioning and biodiversity of cold northern ecosystems and their reindeer-based cultures and economics. 2 We hypothesized that, in climatically milder parts of the Arctic, where ecosystems have relatively dense plant canopies, climate warming and/or increased nutrient availability leads to decline in macrolichen abundance as a function of increased abundance of vascular plants. In more open high-arctic or arctic-alpine plant communities such a relationship should be absent. To test this, we synthesized cross-continental arctic vegetation data from ecosystem manipulation experiments simulating mostly warming and increased nutrient availability, and compared these with similar data from natural environmental gradients. 3 Regressions between abundance or biomass of macrolichens and vascular plants were consistently negative across the subarctic and mid-arctic experimental studies. Such a pattern did not emerge in the coldest high-arctic or arctic-alpine sites. The slopes of the negative regressions increased across 10 sites as the climate became milder (as indicated by a simple climatic index) or the vegetation denser (greater site above-ground biomass). 4 Seven natural vegetation gradients in the lower-altitude sub- and mid-arctic zone confirmed the patterns seen in the experimental studies, showing consistent negative relationships between abundance of macrolichens and vascular plants. 5 We conclude that the data supported the hypothesis. Macrolichens in climatically milder arctic ecosystems may decline if and where global changes cause vascular plants to increase in abundance. 6 However, a refining of our findings is needed, for instance by integrating other abiotic and biotic effects such as reindeer grazing feedback on the balance between vascular plants and lichens.
Subject headings
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Cornelissen, C
-
Callaghan, V
-
Alatalo, Juha, 1 ...
-
Michelsen, A
-
Graglia, E
-
Hartley, E
-
show more...
-
Hik, S
-
Hobbie, E
-
Press, C
-
Robinson, H
-
Henry, R
-
Shaver, R
-
Phoenix, K
-
Jones, G
-
Jonasson, S
-
Chapin, S
-
Molau, U
-
Neill, C
-
Lee, A
-
Melillo, M
-
Sveinbjornsson, ...
-
Aerts, R
-
show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Biological Scien ...
- Articles in the publication
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Journal of Ecolo ...
- By the university
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Mälardalen University
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Uppsala University