Different parts, different stories: climate sensitivity of growth is stronger in root collars vs. stems in tundra shrubs
Abstract Shrub densification has been widely reported across the circumpolar arctic and subarctic biomes in recent years. Long‐term analyses based on dendrochronological techniques applied to shrubs have linked this phenomenon to climate change. However, the multi‐stemmed structure of shrubs makes t...
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crwiley:10.1111/gcb.13631 2024-10-13T14:05:45+00:00 Different parts, different stories: climate sensitivity of growth is stronger in root collars vs. stems in tundra shrubs Ropars, Pascale Angers‐Blondin, Sandra Gagnon, Marianne Myers‐Smith, Isla H. Lévesque, Esther Boudreau, Stéphane Natural Sciences and Engineering Research Council of Canada (NSERC) Fonds de Recherche Québec - Nature et Technologies (FRQNT) Northern Scientific Training Program NSERC CREATE training Program in Northern Environmental Sciences (EnviroNorth) Northern Research Chair on Disturbance Ecology 2017 http://dx.doi.org/10.1111/gcb.13631 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.13631 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.13631 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 23, issue 8, page 3281-3291 ISSN 1354-1013 1365-2486 journal-article 2017 crwiley https://doi.org/10.1111/gcb.13631 2024-09-17T04:44:55Z Abstract Shrub densification has been widely reported across the circumpolar arctic and subarctic biomes in recent years. Long‐term analyses based on dendrochronological techniques applied to shrubs have linked this phenomenon to climate change. However, the multi‐stemmed structure of shrubs makes them difficult to sample and therefore leads to non‐uniform sampling protocols among shrub ecologists, who will favor either root collars or stems to conduct dendrochronological analyses. Through a comparative study of the use of root collars and stems of Betula glandulosa , a common North American shrub species, we evaluated the relative sensitivity of each plant part to climate variables and assessed whether this sensitivity is consistent across three different types of environments in northwestern Québec, Canada (terrace, hilltop and snowbed). We found that root collars had greater sensitivity to climate than stems and that these differences were maintained across the three types of environments. Growth at the root collar was best explained by spring precipitation and summer temperature, whereas stem growth showed weak and inconsistent responses to climate variables. Moreover, sensitivity to climate was not consistent among plant parts, as individuals having climate‐sensitive root collars did not tend to have climate‐sensitive stems. These differences in sensitivity of shrub parts to climate highlight the complexity of resource allocation in multi‐stemmed plants. Whereas stem initiation and growth are driven by microenvironmental variables such as light availability and competition, root collars integrate the growth of all plant parts instead, rendering them less affected by mechanisms such as competition and more responsive to signals of global change. Although further investigations are required to determine the degree to which these findings are generalizable across the tundra biome, our results indicate that consistency and caution in the choice of plant parts are a key consideration for the success of future ... Article in Journal/Newspaper Arctic Climate change Subarctic Tundra Wiley Online Library Arctic Canada Global Change Biology 23 8 3281 3291 |
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Wiley Online Library |
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English |
description |
Abstract Shrub densification has been widely reported across the circumpolar arctic and subarctic biomes in recent years. Long‐term analyses based on dendrochronological techniques applied to shrubs have linked this phenomenon to climate change. However, the multi‐stemmed structure of shrubs makes them difficult to sample and therefore leads to non‐uniform sampling protocols among shrub ecologists, who will favor either root collars or stems to conduct dendrochronological analyses. Through a comparative study of the use of root collars and stems of Betula glandulosa , a common North American shrub species, we evaluated the relative sensitivity of each plant part to climate variables and assessed whether this sensitivity is consistent across three different types of environments in northwestern Québec, Canada (terrace, hilltop and snowbed). We found that root collars had greater sensitivity to climate than stems and that these differences were maintained across the three types of environments. Growth at the root collar was best explained by spring precipitation and summer temperature, whereas stem growth showed weak and inconsistent responses to climate variables. Moreover, sensitivity to climate was not consistent among plant parts, as individuals having climate‐sensitive root collars did not tend to have climate‐sensitive stems. These differences in sensitivity of shrub parts to climate highlight the complexity of resource allocation in multi‐stemmed plants. Whereas stem initiation and growth are driven by microenvironmental variables such as light availability and competition, root collars integrate the growth of all plant parts instead, rendering them less affected by mechanisms such as competition and more responsive to signals of global change. Although further investigations are required to determine the degree to which these findings are generalizable across the tundra biome, our results indicate that consistency and caution in the choice of plant parts are a key consideration for the success of future ... |
author2 |
Natural Sciences and Engineering Research Council of Canada (NSERC) Fonds de Recherche Québec - Nature et Technologies (FRQNT) Northern Scientific Training Program NSERC CREATE training Program in Northern Environmental Sciences (EnviroNorth) Northern Research Chair on Disturbance Ecology |
format |
Article in Journal/Newspaper |
author |
Ropars, Pascale Angers‐Blondin, Sandra Gagnon, Marianne Myers‐Smith, Isla H. Lévesque, Esther Boudreau, Stéphane |
spellingShingle |
Ropars, Pascale Angers‐Blondin, Sandra Gagnon, Marianne Myers‐Smith, Isla H. Lévesque, Esther Boudreau, Stéphane Different parts, different stories: climate sensitivity of growth is stronger in root collars vs. stems in tundra shrubs |
author_facet |
Ropars, Pascale Angers‐Blondin, Sandra Gagnon, Marianne Myers‐Smith, Isla H. Lévesque, Esther Boudreau, Stéphane |
author_sort |
Ropars, Pascale |
title |
Different parts, different stories: climate sensitivity of growth is stronger in root collars vs. stems in tundra shrubs |
title_short |
Different parts, different stories: climate sensitivity of growth is stronger in root collars vs. stems in tundra shrubs |
title_full |
Different parts, different stories: climate sensitivity of growth is stronger in root collars vs. stems in tundra shrubs |
title_fullStr |
Different parts, different stories: climate sensitivity of growth is stronger in root collars vs. stems in tundra shrubs |
title_full_unstemmed |
Different parts, different stories: climate sensitivity of growth is stronger in root collars vs. stems in tundra shrubs |
title_sort |
different parts, different stories: climate sensitivity of growth is stronger in root collars vs. stems in tundra shrubs |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/gcb.13631 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fgcb.13631 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.13631 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Climate change Subarctic Tundra |
genre_facet |
Arctic Climate change Subarctic Tundra |
op_source |
Global Change Biology volume 23, issue 8, page 3281-3291 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gcb.13631 |
container_title |
Global Change Biology |
container_volume |
23 |
container_issue |
8 |
container_start_page |
3281 |
op_container_end_page |
3291 |
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1812811799667408896 |