Data from: The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis
1.When tree seedlings establish beyond the current tree line due to climate warming, they encounter existing vegetation, such as bryophytes that often dominate in arctic and alpine tundra. The stress gradient hypothesis (SGH) predicts that plant interactions in tundra become increasingly negative as...
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Online Access: | http://hdl.handle.net/10255/dryad.161410 https://doi.org/10.5061/dryad.84397 |
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ftdryad:oai:v1.datadryad.org:10255/dryad.161410 2023-05-15T15:19:08+02:00 Data from: The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis Lett, Signe Wardle, David A. Nilsson, Marie-Charlotte Teuber, Laurenz M. Dorrepaal, Ellen 2017-11-07T22:20:30Z http://hdl.handle.net/10255/dryad.161410 https://doi.org/10.5061/dryad.84397 unknown doi:10.5061/dryad.84397/1 doi:10.1111/1365-2745.12898 doi:10.5061/dryad.84397 Lett S, Wardle DA, Nilsson M, Teuber LM, Dorrepaal E (2018) The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis. Journal of Ecology 106(3): 1142-1155. http://hdl.handle.net/10255/dryad.161410 alpine climate change competition facilitation plant-plant interactions snow cover subarctic tree line Article 2017 ftdryad https://doi.org/10.5061/dryad.84397 https://doi.org/10.5061/dryad.84397/1 https://doi.org/10.1111/1365-2745.12898 2020-01-01T15:59:08Z 1.When tree seedlings establish beyond the current tree line due to climate warming, they encounter existing vegetation, such as bryophytes that often dominate in arctic and alpine tundra. The stress gradient hypothesis (SGH) predicts that plant interactions in tundra become increasingly negative as climate warms and conditions become less harsh. However, for seedlings climate warming might not result in lower winter stress, if insulating snow cover is reduced. 2.We aimed to understand to if bryophytes facilitate seedling survival in a changing winter climate and if these effects of bryophytes on tree seedlings comply with the SGH along elevational gradients under contrasting snow conditions. 3.In the Swedish subarctic, we transplanted intact bryophyte cores covered by each of three bryophyte species and bryophyte-free control soil from above the tree line to two field common-garden sites, representing current and future tree line air temperature conditions (i.e. current tree line elevation and a lower, warmer, elevation below the tree line). We planted seedlings of Betula pubescens and Pinus sylvestris into these cores and subjected them to experimental manipulation of snow cover during one winter. 4.In agreement with the SGH, milder conditions caused by increased snow cover enhanced the generally negative or neutral effects of bryophytes on seedlings immediately after winter. Further, survival of P. sylvestris seedlings after one full year was higher at lower elevation, especially when snow cover was thinner. However, in contrast with the SGH, impacts of bryophytes on over-winter survival of seedlings did not differ between elevations, and impacts on survival of B. pubescens seedlings after one year was more negative at lower elevation. Bryophyte species differed in their effect on seedling survival after winter, but these differences were not related to their insulating capacity. 5.Synthesis: Our study demonstrates that interactions from bryophytes can modify the impacts of winter climate change on tree seedlings, and vice versa. These responses do not always comply with SGH, but could ultimately have consequences for large-scale ecological processes such as tree-line shifts. These new insights need to be taken into account in predictions of plant species responses to climate change. Article in Journal/Newspaper Arctic Climate change Subarctic Tundra Dryad Digital Repository (Duke University) Arctic |
institution |
Open Polar |
collection |
Dryad Digital Repository (Duke University) |
op_collection_id |
ftdryad |
language |
unknown |
topic |
alpine climate change competition facilitation plant-plant interactions snow cover subarctic tree line |
spellingShingle |
alpine climate change competition facilitation plant-plant interactions snow cover subarctic tree line Lett, Signe Wardle, David A. Nilsson, Marie-Charlotte Teuber, Laurenz M. Dorrepaal, Ellen Data from: The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis |
topic_facet |
alpine climate change competition facilitation plant-plant interactions snow cover subarctic tree line |
description |
1.When tree seedlings establish beyond the current tree line due to climate warming, they encounter existing vegetation, such as bryophytes that often dominate in arctic and alpine tundra. The stress gradient hypothesis (SGH) predicts that plant interactions in tundra become increasingly negative as climate warms and conditions become less harsh. However, for seedlings climate warming might not result in lower winter stress, if insulating snow cover is reduced. 2.We aimed to understand to if bryophytes facilitate seedling survival in a changing winter climate and if these effects of bryophytes on tree seedlings comply with the SGH along elevational gradients under contrasting snow conditions. 3.In the Swedish subarctic, we transplanted intact bryophyte cores covered by each of three bryophyte species and bryophyte-free control soil from above the tree line to two field common-garden sites, representing current and future tree line air temperature conditions (i.e. current tree line elevation and a lower, warmer, elevation below the tree line). We planted seedlings of Betula pubescens and Pinus sylvestris into these cores and subjected them to experimental manipulation of snow cover during one winter. 4.In agreement with the SGH, milder conditions caused by increased snow cover enhanced the generally negative or neutral effects of bryophytes on seedlings immediately after winter. Further, survival of P. sylvestris seedlings after one full year was higher at lower elevation, especially when snow cover was thinner. However, in contrast with the SGH, impacts of bryophytes on over-winter survival of seedlings did not differ between elevations, and impacts on survival of B. pubescens seedlings after one year was more negative at lower elevation. Bryophyte species differed in their effect on seedling survival after winter, but these differences were not related to their insulating capacity. 5.Synthesis: Our study demonstrates that interactions from bryophytes can modify the impacts of winter climate change on tree seedlings, and vice versa. These responses do not always comply with SGH, but could ultimately have consequences for large-scale ecological processes such as tree-line shifts. These new insights need to be taken into account in predictions of plant species responses to climate change. |
format |
Article in Journal/Newspaper |
author |
Lett, Signe Wardle, David A. Nilsson, Marie-Charlotte Teuber, Laurenz M. Dorrepaal, Ellen |
author_facet |
Lett, Signe Wardle, David A. Nilsson, Marie-Charlotte Teuber, Laurenz M. Dorrepaal, Ellen |
author_sort |
Lett, Signe |
title |
Data from: The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis |
title_short |
Data from: The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis |
title_full |
Data from: The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis |
title_fullStr |
Data from: The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis |
title_full_unstemmed |
Data from: The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis |
title_sort |
data from: the role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis |
publishDate |
2017 |
url |
http://hdl.handle.net/10255/dryad.161410 https://doi.org/10.5061/dryad.84397 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Subarctic Tundra |
genre_facet |
Arctic Climate change Subarctic Tundra |
op_relation |
doi:10.5061/dryad.84397/1 doi:10.1111/1365-2745.12898 doi:10.5061/dryad.84397 Lett S, Wardle DA, Nilsson M, Teuber LM, Dorrepaal E (2018) The role of bryophytes for tree seedling responses to winter climate change: implications for the stress gradient hypothesis. Journal of Ecology 106(3): 1142-1155. http://hdl.handle.net/10255/dryad.161410 |
op_doi |
https://doi.org/10.5061/dryad.84397 https://doi.org/10.5061/dryad.84397/1 https://doi.org/10.1111/1365-2745.12898 |
_version_ |
1766349314912681984 |