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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 (författare)
- Vrije Univ Amsterdam
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Callaghan, V (författare)
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- Alatalo, Juha, 1966- (författare)
- Göteborgs Universitet
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Michelsen, A (författare)
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Graglia, E (författare)
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Hartley, E (författare)
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Hik, S (författare)
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Hobbie, E (författare)
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Press, C (författare)
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Robinson, H (författare)
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Henry, R (författare)
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Shaver, R (författare)
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Phoenix, K (författare)
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Jones, G (författare)
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Jonasson, S (författare)
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Chapin, S (författare)
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Molau, U (författare)
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Neill, C (författare)
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Lee, A (författare)
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Melillo, M (författare)
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Sveinbjornsson, B (författare)
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Aerts, R (författare)
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(creator_code:org_t)
- 2004-01-23
- 2001
- Engelska.
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Ingår i: Journal of Ecology. - : Wiley. - 0022-0477 .- 1365-2745. ; 89:6, s. 984-994
- Relaterad länk:
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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
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Cornelissen, C
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Callaghan, V
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Alatalo, Juha, 1 ...
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Michelsen, A
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Graglia, E
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Hartley, E
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visa fler...
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Hik, S
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Hobbie, E
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Press, C
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Robinson, H
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Henry, R
-
Shaver, R
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Phoenix, K
-
Jones, G
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Jonasson, S
-
Chapin, S
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Molau, U
-
Neill, C
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Lee, A
-
Melillo, M
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Sveinbjornsson, ...
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Aerts, R
-
visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Biologi
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Journal of Ecolo ...
- Av lärosätet
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Mälardalens universitet
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Uppsala universitet