Arctic warming on two continents has consistent negativ effects on lichen diversity and mixed effects on bryophyte diversity

S.I. Lang, J.H.C. Cornelissen, G.R. Shaver, M. Ahrens, T.V. Callaghan, U. Molau, C.J.F. ter Braak, A. Hölzer, R. Aerts

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Abstract

Little is known about the impact of changing temperature regimes on composition and diversity of cryptogam communities in the Arctic and Subarctic, despite the well-known importance of lichens and bryophytes to the functioning and climate feedbacks of northern ecosystems. We investigated changes in diversity and abundance of lichens and bryophytes within long-term (9–16 years) warming experiments and along natural climatic gradients, ranging from Swedish subarctic birch forest and subarctic/subalpine tundra to Alaskan arctic tussock tundra. In both Sweden and Alaska, lichen diversity responded negatively to experimental warming (with the exception of a birch forest) and to higher temperatures along climatic gradients. Bryophytes were less sensitive to experimental warming than lichens, but depending on the length of the gradient, bryophyte diversity decreased both with increasing temperatures and at extremely low temperatures. Among bryophytes, Sphagnum mosses were particularly resistant to experimental warming in terms of both abundance and diversity. Temperature, on both continents, was the main driver of species composition within experiments and along gradients, with the exception of the Swedish subarctic birch forest where amount of litter constituted the best explanatory variable. In a warming experiment in moist acidic tussock tundra in Alaska, temperature together with soil ammonium availability were the most important factors influencing species composition. Overall, dwarf shrub abundance (deciduous and evergreen) was positively related to warming but so were the bryophytes Sphagnum girgensohnii, Hylocomium splendens and Pleurozium schreberi; the majority of other cryptogams showed a negative relationship to warming. This unique combination of intercontinental comparison, natural gradient studies and experimental studies shows that cryptogam diversity and abundance, especially within lichens, is likely to decrease under arctic climate warming. Given the many ecosystem processes affected by cryptogams in high latitudes (e.g. carbon sequestration, N2-fixation, trophic interactions), these changes will have important feedback consequences for ecosystem functions and climate
LanguageEnglish
Pages1096-1107
JournalGlobal Change Biology
Volume18
Issue number3
DOIs
Publication statusPublished - 2012

Fingerprint

bryophyte
lichen
warming
Ecosystems
tundra
Temperature
Chemical analysis
Feedback
temperature
Experiments
Ammonium Compounds
climate feedback
continent
effect
Lichens
ecosystem
trophic interaction
experiment
climate
Carbon

Keywords

  • simulated environmental-change
  • plant community responses
  • dwarf shrub heath
  • nitrogen mineralization
  • climate-change
  • tundra
  • vegetation
  • biomass
  • growth
  • ecosystems

Cite this

Lang, S. I., Cornelissen, J. H. C., Shaver, G. R., Ahrens, M., Callaghan, T. V., Molau, U., ... Aerts, R. (2012). Arctic warming on two continents has consistent negativ effects on lichen diversity and mixed effects on bryophyte diversity. Global Change Biology, 18(3), 1096-1107. https://doi.org/10.1111/j.1365-2486.2011.02570.x
Lang, S.I. ; Cornelissen, J.H.C. ; Shaver, G.R. ; Ahrens, M. ; Callaghan, T.V. ; Molau, U. ; ter Braak, C.J.F. ; Hölzer, A. ; Aerts, R. / Arctic warming on two continents has consistent negativ effects on lichen diversity and mixed effects on bryophyte diversity. In: Global Change Biology. 2012 ; Vol. 18, No. 3. pp. 1096-1107.
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Lang, SI, Cornelissen, JHC, Shaver, GR, Ahrens, M, Callaghan, TV, Molau, U, ter Braak, CJF, Hölzer, A & Aerts, R 2012, 'Arctic warming on two continents has consistent negativ effects on lichen diversity and mixed effects on bryophyte diversity', Global Change Biology, vol. 18, no. 3, pp. 1096-1107. https://doi.org/10.1111/j.1365-2486.2011.02570.x

Arctic warming on two continents has consistent negativ effects on lichen diversity and mixed effects on bryophyte diversity. / Lang, S.I.; Cornelissen, J.H.C.; Shaver, G.R.; Ahrens, M.; Callaghan, T.V.; Molau, U.; ter Braak, C.J.F.; Hölzer, A.; Aerts, R.

In: Global Change Biology, Vol. 18, No. 3, 2012, p. 1096-1107.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Arctic warming on two continents has consistent negativ effects on lichen diversity and mixed effects on bryophyte diversity

AU - Lang, S.I.

AU - Cornelissen, J.H.C.

AU - Shaver, G.R.

AU - Ahrens, M.

AU - Callaghan, T.V.

AU - Molau, U.

AU - ter Braak, C.J.F.

AU - Hölzer, A.

AU - Aerts, R.

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AB - Little is known about the impact of changing temperature regimes on composition and diversity of cryptogam communities in the Arctic and Subarctic, despite the well-known importance of lichens and bryophytes to the functioning and climate feedbacks of northern ecosystems. We investigated changes in diversity and abundance of lichens and bryophytes within long-term (9–16 years) warming experiments and along natural climatic gradients, ranging from Swedish subarctic birch forest and subarctic/subalpine tundra to Alaskan arctic tussock tundra. In both Sweden and Alaska, lichen diversity responded negatively to experimental warming (with the exception of a birch forest) and to higher temperatures along climatic gradients. Bryophytes were less sensitive to experimental warming than lichens, but depending on the length of the gradient, bryophyte diversity decreased both with increasing temperatures and at extremely low temperatures. Among bryophytes, Sphagnum mosses were particularly resistant to experimental warming in terms of both abundance and diversity. Temperature, on both continents, was the main driver of species composition within experiments and along gradients, with the exception of the Swedish subarctic birch forest where amount of litter constituted the best explanatory variable. In a warming experiment in moist acidic tussock tundra in Alaska, temperature together with soil ammonium availability were the most important factors influencing species composition. Overall, dwarf shrub abundance (deciduous and evergreen) was positively related to warming but so were the bryophytes Sphagnum girgensohnii, Hylocomium splendens and Pleurozium schreberi; the majority of other cryptogams showed a negative relationship to warming. This unique combination of intercontinental comparison, natural gradient studies and experimental studies shows that cryptogam diversity and abundance, especially within lichens, is likely to decrease under arctic climate warming. Given the many ecosystem processes affected by cryptogams in high latitudes (e.g. carbon sequestration, N2-fixation, trophic interactions), these changes will have important feedback consequences for ecosystem functions and climate

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KW - climate-change

KW - tundra

KW - vegetation

KW - biomass

KW - growth

KW - ecosystems

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