Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons
We have examined organismic responses of Dryas octopetala to simulated changes in the summer climate at four tundra sites as part of the International Tundra Experiment (ITEX). Our study sites are located in the High Arctic, on Svalbard, Norway, in the Low Arctic at Abisko, Sweden, and at Toolik Lak...
Published in: | Global Change Biology |
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Format: | Article in Journal/Newspaper |
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Online Access: | http://hdl.handle.net/1893/28153 https://doi.org/10.1111/j.1365-2486.1997.gcb143.x http://dspace.stir.ac.uk/bitstream/1893/28153/1/WELKER_et_al-1997-Global_Change_Biology.pdf |
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ftunivstirling:oai:dspace.stir.ac.uk:1893/28153 2023-05-15T12:59:48+02:00 Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons Welker, Jeffery M Molau, Ulf Parsons, Andrew N Robinson, Clare H Wookey, Philip University of London Colorado State University University of Gothenburg King's College London Uppsala University orcid:0000-0001-5957-6424 1997-12-31 application/pdf http://hdl.handle.net/1893/28153 https://doi.org/10.1111/j.1365-2486.1997.gcb143.x http://dspace.stir.ac.uk/bitstream/1893/28153/1/WELKER_et_al-1997-Global_Change_Biology.pdf en eng Wiley Welker JM, Molau U, Parsons AN, Robinson CH & Wookey P (1997) Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons. Global Change Biology, 3 (S1), pp. 61-73. https://doi.org/10.1111/j.1365-2486.1997.gcb143.x http://hdl.handle.net/1893/28153 doi:10.1111/j.1365-2486.1997.gcb143.x WOS:000071285300007 523938 http://dspace.stir.ac.uk/bitstream/1893/28153/1/WELKER_et_al-1997-Global_Change_Biology.pdf The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. http://www.rioxx.net/licenses/under-embargo-all-rights-reserved 2999-12-31 [WELKER_et_al-1997-Global_Change_Biology.pdf] The publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work. tundra climate change dwarf shrub Arctic alpine comparative studies ITEX Journal Article VoR - Version of Record 1997 ftunivstirling https://doi.org/10.1111/j.1365-2486.1997.gcb143.x 2022-06-13T18:44:52Z We have examined organismic responses of Dryas octopetala to simulated changes in the summer climate at four tundra sites as part of the International Tundra Experiment (ITEX). Our study sites are located in the High Arctic, on Svalbard, Norway, in the Low Arctic at Abisko, Sweden, and at Toolik Lake, Alaska, USA and our temperate alpine site is at Niwot Ridge, Colorado, USA. These sites represent a range of tundra temperature and precipitation regimes, being generally cold and dry in the High Arctic and warmer and wetter at Toolik Lake and Niwot Ridge. Results from our studies indicate organismic attributes such as flowering shoot length varies by 30% between low and high arctic populations and that experimental warming results in significant increases in shoot height at three of four sites. We find that phenological development of Dryas is accelerated under experimentally warmed conditions which corresponds with a lengthening of the growing season in autumn, greater degrees of seed set and a higher likelihood of colonization of bare ground. We also observe that Dryas dominated ecosystems which are exposed to experimental manipulations are capable of exhibiting net carbon sequestration in late autumn, and that Dryas photosynthesis and green leaf biomass is significantly greater under warmer as opposed to ambient temperature conditions. Dryas leaf nitrogen is also significantly lowered under warmer conditions resulting in senescent leaves having a higher C:N ratio than those under ambient conditions. Together these findings indicate that Dryas phenology and carbon flux may be altered to the greatest degree in spring and again in autumn by higher summer temperatures and that simultaneously both positive and negative feedback effects may result from changes in plant and ecosystem performance. © 1997 Blackwell Science Ltd. Article in Journal/Newspaper Abisko Arctic Climate change Dryas octopetala Svalbard Tundra Alaska University of Stirling: Stirling Digital Research Repository Abisko ENVELOPE(18.829,18.829,68.349,68.349) Arctic Norway Svalbard Global Change Biology 3 S1 61 73 |
institution |
Open Polar |
collection |
University of Stirling: Stirling Digital Research Repository |
op_collection_id |
ftunivstirling |
language |
English |
topic |
tundra climate change dwarf shrub Arctic alpine comparative studies ITEX |
spellingShingle |
tundra climate change dwarf shrub Arctic alpine comparative studies ITEX Welker, Jeffery M Molau, Ulf Parsons, Andrew N Robinson, Clare H Wookey, Philip Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons |
topic_facet |
tundra climate change dwarf shrub Arctic alpine comparative studies ITEX |
description |
We have examined organismic responses of Dryas octopetala to simulated changes in the summer climate at four tundra sites as part of the International Tundra Experiment (ITEX). Our study sites are located in the High Arctic, on Svalbard, Norway, in the Low Arctic at Abisko, Sweden, and at Toolik Lake, Alaska, USA and our temperate alpine site is at Niwot Ridge, Colorado, USA. These sites represent a range of tundra temperature and precipitation regimes, being generally cold and dry in the High Arctic and warmer and wetter at Toolik Lake and Niwot Ridge. Results from our studies indicate organismic attributes such as flowering shoot length varies by 30% between low and high arctic populations and that experimental warming results in significant increases in shoot height at three of four sites. We find that phenological development of Dryas is accelerated under experimentally warmed conditions which corresponds with a lengthening of the growing season in autumn, greater degrees of seed set and a higher likelihood of colonization of bare ground. We also observe that Dryas dominated ecosystems which are exposed to experimental manipulations are capable of exhibiting net carbon sequestration in late autumn, and that Dryas photosynthesis and green leaf biomass is significantly greater under warmer as opposed to ambient temperature conditions. Dryas leaf nitrogen is also significantly lowered under warmer conditions resulting in senescent leaves having a higher C:N ratio than those under ambient conditions. Together these findings indicate that Dryas phenology and carbon flux may be altered to the greatest degree in spring and again in autumn by higher summer temperatures and that simultaneously both positive and negative feedback effects may result from changes in plant and ecosystem performance. © 1997 Blackwell Science Ltd. |
author2 |
University of London Colorado State University University of Gothenburg King's College London Uppsala University orcid:0000-0001-5957-6424 |
format |
Article in Journal/Newspaper |
author |
Welker, Jeffery M Molau, Ulf Parsons, Andrew N Robinson, Clare H Wookey, Philip |
author_facet |
Welker, Jeffery M Molau, Ulf Parsons, Andrew N Robinson, Clare H Wookey, Philip |
author_sort |
Welker, Jeffery M |
title |
Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons |
title_short |
Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons |
title_full |
Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons |
title_fullStr |
Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons |
title_full_unstemmed |
Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons |
title_sort |
responses of dryas octopetala to itex environmental manipulations: a synthesis with circumpolar comparisons |
publisher |
Wiley |
publishDate |
1997 |
url |
http://hdl.handle.net/1893/28153 https://doi.org/10.1111/j.1365-2486.1997.gcb143.x http://dspace.stir.ac.uk/bitstream/1893/28153/1/WELKER_et_al-1997-Global_Change_Biology.pdf |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) |
geographic |
Abisko Arctic Norway Svalbard |
geographic_facet |
Abisko Arctic Norway Svalbard |
genre |
Abisko Arctic Climate change Dryas octopetala Svalbard Tundra Alaska |
genre_facet |
Abisko Arctic Climate change Dryas octopetala Svalbard Tundra Alaska |
op_relation |
Welker JM, Molau U, Parsons AN, Robinson CH & Wookey P (1997) Responses of Dryas octopetala to ITEX environmental manipulations: a synthesis with circumpolar comparisons. Global Change Biology, 3 (S1), pp. 61-73. https://doi.org/10.1111/j.1365-2486.1997.gcb143.x http://hdl.handle.net/1893/28153 doi:10.1111/j.1365-2486.1997.gcb143.x WOS:000071285300007 523938 http://dspace.stir.ac.uk/bitstream/1893/28153/1/WELKER_et_al-1997-Global_Change_Biology.pdf |
op_rights |
The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. http://www.rioxx.net/licenses/under-embargo-all-rights-reserved 2999-12-31 [WELKER_et_al-1997-Global_Change_Biology.pdf] The publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work. |
op_doi |
https://doi.org/10.1111/j.1365-2486.1997.gcb143.x |
container_title |
Global Change Biology |
container_volume |
3 |
container_issue |
S1 |
container_start_page |
61 |
op_container_end_page |
73 |
_version_ |
1766106931746832384 |