No divergence in Cassiope tetragona: persistence of growth response along a latitudinal temperature gradient and under multi-year experimental warming
Background and Aims The dwarf shrub Cassiope tetragona (Arctic bell-heather) is increasingly used for arctic climate reconstructions, the reliability of which depends on the existence of a linear climate–growth relationship. This relationship was examined over a high-arctic to sub-arctic temperature...
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fthighwire:oai:open-archive.highwire.org:annbot:mcs123v1 2023-05-15T12:59:50+02:00 No divergence in Cassiope tetragona: persistence of growth response along a latitudinal temperature gradient and under multi-year experimental warming Weijers, Stef Greve Alsos, Inger Bronken Eidesen, Pernille Broekman, Rob Loonen, Maarten J.J.E. Rozema, Jelte 2012-06-14 01:08:21.0 text/html http://aob.oxfordjournals.org/cgi/content/short/mcs123v1 https://doi.org/10.1093/aob/mcs123 en eng Oxford University Press http://aob.oxfordjournals.org/cgi/content/short/mcs123v1 http://dx.doi.org/10.1093/aob/mcs123 Copyright (C) 2012, Oxford University Press Article TEXT 2012 fthighwire https://doi.org/10.1093/aob/mcs123 2013-05-27T20:12:43Z Background and Aims The dwarf shrub Cassiope tetragona (Arctic bell-heather) is increasingly used for arctic climate reconstructions, the reliability of which depends on the existence of a linear climate–growth relationship. This relationship was examined over a high-arctic to sub-arctic temperature gradient and under multi-year artificial warming at a high-arctic site. Methods Growth chronologies of annual shoot length, as well as total leaf length, number of leaves and average leaf length per year, were constructed for three sites. Cassiope tetragona was sampled near its cold tolerance limit at Ny-Ålesund, Svalbard, at its assumed climatic optimum in Endalen, Svalbard, and near its European southern limit at Abisko, Sweden. Together these sites represent the entire temperature gradient of this species. Leaf life span was also determined. Each growing season from 2004 to 2010, 17 open top chambers (OTCs) were placed near Ny-Ålesund, thus increasing the daily mean temperatures by 1·23°C. At the end of the 2010 growing season, shoots were harvested from OTCs and control plots, and growth parameters were measured. Key Results All growth parameters, except average leaf length, exhibited a linear positive response ( R 2 between 0·63 and 0·91) to mean July temperature over the temperature gradient. Average leaf life span was 1·4 years shorter in sub-arctic Sweden compared with arctic Svalbard. All growth parameters increased in response to the experimental warming; the leaf life span was, however, not significantly affected by OTC warming. Conclusions The linear July temperature–growth relationships, as well as the 7 year effect of experimental warming, confirm that the growth parameters annual shoot length, total leaf length and number of leaves per year can reliably be used for monitoring and reconstructing temperature changes. Furthermore, reconstructing July temperature from these parameters is not hampered by divergence. Text Abisko Arctic bell-heather Arctic Cassiope tetragona Ny Ålesund Ny-Ålesund Svalbard HighWire Press (Stanford University) Arctic Svalbard Ny-Ålesund Abisko ENVELOPE(18.829,18.829,68.349,68.349) Endalen ENVELOPE(15.664,15.664,78.168,78.168) Annals of Botany 110 3 653 665 |
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HighWire Press (Stanford University) |
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English |
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Article Weijers, Stef Greve Alsos, Inger Bronken Eidesen, Pernille Broekman, Rob Loonen, Maarten J.J.E. Rozema, Jelte No divergence in Cassiope tetragona: persistence of growth response along a latitudinal temperature gradient and under multi-year experimental warming |
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Article |
description |
Background and Aims The dwarf shrub Cassiope tetragona (Arctic bell-heather) is increasingly used for arctic climate reconstructions, the reliability of which depends on the existence of a linear climate–growth relationship. This relationship was examined over a high-arctic to sub-arctic temperature gradient and under multi-year artificial warming at a high-arctic site. Methods Growth chronologies of annual shoot length, as well as total leaf length, number of leaves and average leaf length per year, were constructed for three sites. Cassiope tetragona was sampled near its cold tolerance limit at Ny-Ålesund, Svalbard, at its assumed climatic optimum in Endalen, Svalbard, and near its European southern limit at Abisko, Sweden. Together these sites represent the entire temperature gradient of this species. Leaf life span was also determined. Each growing season from 2004 to 2010, 17 open top chambers (OTCs) were placed near Ny-Ålesund, thus increasing the daily mean temperatures by 1·23°C. At the end of the 2010 growing season, shoots were harvested from OTCs and control plots, and growth parameters were measured. Key Results All growth parameters, except average leaf length, exhibited a linear positive response ( R 2 between 0·63 and 0·91) to mean July temperature over the temperature gradient. Average leaf life span was 1·4 years shorter in sub-arctic Sweden compared with arctic Svalbard. All growth parameters increased in response to the experimental warming; the leaf life span was, however, not significantly affected by OTC warming. Conclusions The linear July temperature–growth relationships, as well as the 7 year effect of experimental warming, confirm that the growth parameters annual shoot length, total leaf length and number of leaves per year can reliably be used for monitoring and reconstructing temperature changes. Furthermore, reconstructing July temperature from these parameters is not hampered by divergence. |
format |
Text |
author |
Weijers, Stef Greve Alsos, Inger Bronken Eidesen, Pernille Broekman, Rob Loonen, Maarten J.J.E. Rozema, Jelte |
author_facet |
Weijers, Stef Greve Alsos, Inger Bronken Eidesen, Pernille Broekman, Rob Loonen, Maarten J.J.E. Rozema, Jelte |
author_sort |
Weijers, Stef |
title |
No divergence in Cassiope tetragona: persistence of growth response along a latitudinal temperature gradient and under multi-year experimental warming |
title_short |
No divergence in Cassiope tetragona: persistence of growth response along a latitudinal temperature gradient and under multi-year experimental warming |
title_full |
No divergence in Cassiope tetragona: persistence of growth response along a latitudinal temperature gradient and under multi-year experimental warming |
title_fullStr |
No divergence in Cassiope tetragona: persistence of growth response along a latitudinal temperature gradient and under multi-year experimental warming |
title_full_unstemmed |
No divergence in Cassiope tetragona: persistence of growth response along a latitudinal temperature gradient and under multi-year experimental warming |
title_sort |
no divergence in cassiope tetragona: persistence of growth response along a latitudinal temperature gradient and under multi-year experimental warming |
publisher |
Oxford University Press |
publishDate |
2012 |
url |
http://aob.oxfordjournals.org/cgi/content/short/mcs123v1 https://doi.org/10.1093/aob/mcs123 |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) ENVELOPE(15.664,15.664,78.168,78.168) |
geographic |
Arctic Svalbard Ny-Ålesund Abisko Endalen |
geographic_facet |
Arctic Svalbard Ny-Ålesund Abisko Endalen |
genre |
Abisko Arctic bell-heather Arctic Cassiope tetragona Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Abisko Arctic bell-heather Arctic Cassiope tetragona Ny Ålesund Ny-Ålesund Svalbard |
op_relation |
http://aob.oxfordjournals.org/cgi/content/short/mcs123v1 http://dx.doi.org/10.1093/aob/mcs123 |
op_rights |
Copyright (C) 2012, Oxford University Press |
op_doi |
https://doi.org/10.1093/aob/mcs123 |
container_title |
Annals of Botany |
container_volume |
110 |
container_issue |
3 |
container_start_page |
653 |
op_container_end_page |
665 |
_version_ |
1766115635445628928 |