Data from: Wind exposure and light exposure, more than elevation-related temperature, limit tree line seedling abundance on three continents
The transition from seedlings into trees at alpine treelines is a temperature-limited process that ultimately sets the treeline elevation at a global scale. As such, treelines may be key bioassays of global warming effects on species distributions. For global warming to promote upward treeline migra...
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ftzenodo:oai:zenodo.org:4961983 2024-09-15T17:43:27+00:00 Data from: Wind exposure and light exposure, more than elevation-related temperature, limit tree line seedling abundance on three continents McIntire, Eliot J. B. Piper, Frida I. Fajardo, Alex 2017-04-25 https://doi.org/10.5061/dryad.j0v43 unknown Zenodo https://doi.org/10.1111/1365-2745.12599 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.j0v43 oai:zenodo.org:4961983 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode Nothofagus betuloides Pinus cembra Nothofagus antarctica hierarchical modeling Larix decidua plant-climate interactions stress gradient hypothesis Pinus albicaulis alpine treelines Nothofagus pumilio info:eu-repo/semantics/other 2017 ftzenodo https://doi.org/10.5061/dryad.j0v4310.1111/1365-2745.12599 2024-07-27T02:32:14Z The transition from seedlings into trees at alpine treelines is a temperature-limited process that ultimately sets the treeline elevation at a global scale. As such, treelines may be key bioassays of global warming effects on species distributions. For global warming to promote upward treeline migration, as predicted, seedlings must be available. We examined, for the first time at a global scale, elevational patterns and drivers of seedling availability at treelines. Working at 10 sites across five mountain regions, (dry Andes, humid Andes, Patagonian Andes, Swiss Alps, and US Rocky Mountains) with different treeline forms (abrupt and diffuse) and dominated by different tree species (broadleaves and conifers), we answered the following question: how is seedling abundance affected by elevation (as a coarse grain-surrogate of temperature), light exposure (openness immediately above plots) or wind exposure (an index for openness in the horizontal direction), or combinations thereof and, what is the relative importance of each factor? We tested five biological hypotheses to determine the relative strength of these treeline drivers on variable-size sampling plots of seedling abundance (S) (N = 1056). Specifically, we tested likely combinations of temperature limitation (T), light as a resource (light, L) and as a radiation stress (via high light at low temperature, R), wind exposure as a treeline stressor (W) and treeline form (a coarse scale test: abrupt vs. diffuse, D). We found strong, moderate, and weak negative effects of our estimates of wind exposure, radiation stress, and elevation-related temperature on seedling abundance, respectively. We also found a positive effect, at treeline, for site-level treeline diffuseness. Two distinct facilitation mechanisms likely improved seedling abundance at treeline elevation: wind blockage by neighbourhood trees (the sheltering effect) and partial shading by overhead trees. Synthesis. Seedling abundance at alpine treelines is limited by multiple simultaneous factors with ... Other/Unknown Material Antarc* Antarctica Zenodo |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
Nothofagus betuloides Pinus cembra Nothofagus antarctica hierarchical modeling Larix decidua plant-climate interactions stress gradient hypothesis Pinus albicaulis alpine treelines Nothofagus pumilio |
spellingShingle |
Nothofagus betuloides Pinus cembra Nothofagus antarctica hierarchical modeling Larix decidua plant-climate interactions stress gradient hypothesis Pinus albicaulis alpine treelines Nothofagus pumilio McIntire, Eliot J. B. Piper, Frida I. Fajardo, Alex Data from: Wind exposure and light exposure, more than elevation-related temperature, limit tree line seedling abundance on three continents |
topic_facet |
Nothofagus betuloides Pinus cembra Nothofagus antarctica hierarchical modeling Larix decidua plant-climate interactions stress gradient hypothesis Pinus albicaulis alpine treelines Nothofagus pumilio |
description |
The transition from seedlings into trees at alpine treelines is a temperature-limited process that ultimately sets the treeline elevation at a global scale. As such, treelines may be key bioassays of global warming effects on species distributions. For global warming to promote upward treeline migration, as predicted, seedlings must be available. We examined, for the first time at a global scale, elevational patterns and drivers of seedling availability at treelines. Working at 10 sites across five mountain regions, (dry Andes, humid Andes, Patagonian Andes, Swiss Alps, and US Rocky Mountains) with different treeline forms (abrupt and diffuse) and dominated by different tree species (broadleaves and conifers), we answered the following question: how is seedling abundance affected by elevation (as a coarse grain-surrogate of temperature), light exposure (openness immediately above plots) or wind exposure (an index for openness in the horizontal direction), or combinations thereof and, what is the relative importance of each factor? We tested five biological hypotheses to determine the relative strength of these treeline drivers on variable-size sampling plots of seedling abundance (S) (N = 1056). Specifically, we tested likely combinations of temperature limitation (T), light as a resource (light, L) and as a radiation stress (via high light at low temperature, R), wind exposure as a treeline stressor (W) and treeline form (a coarse scale test: abrupt vs. diffuse, D). We found strong, moderate, and weak negative effects of our estimates of wind exposure, radiation stress, and elevation-related temperature on seedling abundance, respectively. We also found a positive effect, at treeline, for site-level treeline diffuseness. Two distinct facilitation mechanisms likely improved seedling abundance at treeline elevation: wind blockage by neighbourhood trees (the sheltering effect) and partial shading by overhead trees. Synthesis. Seedling abundance at alpine treelines is limited by multiple simultaneous factors with ... |
format |
Other/Unknown Material |
author |
McIntire, Eliot J. B. Piper, Frida I. Fajardo, Alex |
author_facet |
McIntire, Eliot J. B. Piper, Frida I. Fajardo, Alex |
author_sort |
McIntire, Eliot J. B. |
title |
Data from: Wind exposure and light exposure, more than elevation-related temperature, limit tree line seedling abundance on three continents |
title_short |
Data from: Wind exposure and light exposure, more than elevation-related temperature, limit tree line seedling abundance on three continents |
title_full |
Data from: Wind exposure and light exposure, more than elevation-related temperature, limit tree line seedling abundance on three continents |
title_fullStr |
Data from: Wind exposure and light exposure, more than elevation-related temperature, limit tree line seedling abundance on three continents |
title_full_unstemmed |
Data from: Wind exposure and light exposure, more than elevation-related temperature, limit tree line seedling abundance on three continents |
title_sort |
data from: wind exposure and light exposure, more than elevation-related temperature, limit tree line seedling abundance on three continents |
publisher |
Zenodo |
publishDate |
2017 |
url |
https://doi.org/10.5061/dryad.j0v43 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://doi.org/10.1111/1365-2745.12599 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.j0v43 oai:zenodo.org:4961983 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.j0v4310.1111/1365-2745.12599 |
_version_ |
1810490439847903232 |