Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regime

Aim: Impacts of global change, such as land-use and climate changes, could produce significant alterations in the elevational patterns of alpine tree line ecotones and their adjacent vegetation zones. Because the responses of the tree line to environmental variations are directly related to successf...

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Autores: Batllori Presas, Enric, Camarero Martínez, Jesús Julio, Gutiérrez Merino, Emilia
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2010
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/225738
Acceso en línea:https://hdl.handle.net/2445/225738
Access Level:acceso abierto
Palabra clave:Pins
Pirineus
Canvi mediambiental global
Pine
Pyrenees
Global environmental change
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spelling Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regimeBatllori Presas, EnricCamarero Martínez, Jesús JulioGutiérrez Merino, EmiliaPinsPirineusCanvi mediambiental globalPinePyreneesGlobal environmental changeAim: Impacts of global change, such as land-use and climate changes, could produce significant alterations in the elevational patterns of alpine tree line ecotones and their adjacent vegetation zones. Because the responses of the tree line to environmental variations are directly related to successful tree regeneration, understanding recruitment dynamics is an indispensable step in tree line research. We aimed to compare potential ecological limitations on recent tree line regeneration in undisturbed and disturbed sites by analysing the demographic structure and spatiotemporal patterns of recruits and large trees. Location: Alpine tree line ecotones comprising Pinus uncinata in the Catalan Pyrenees (north-east Spain) and Andorra. Methods: We assessed the demographic structure and spatial pattern of recent recruitment using techniques of point-pattern and autocorrelation analyses. A total of 3639 P. uncinata individuals were mapped, measured and aged at 12 sites. To evaluate the effects of past disturbances on recent tree line response we compared tree lines that had either been recently affected by human-induced disturbances or had remained undisturbed for many years. Results: The age structure of the tree lines, together with the lack of an age gap between seedlings and saplings, did not indicate recent episodes of high seedling mortality and suggest that recruitment has been frequent under current climate conditions. Seedlings appeared highly aggregated at short distances (up to 3 m), irrespective of disturbance history, and were spatially segregated with respect to large trees. However, we found no evidence of patches of even-aged seedlings, and our results suggest that dispersal events at intermediate distances (10–17 m) may be frequent. Autocorrelation analyses revealed different patterns of density and age of recruits between disturbed and undisturbed tree lines, but the strength and small-scale clustering of seedlings and saplings were very similar between sites. Main conclusions: We found no recruitment limitation on recent tree line dynamics in the Pyrenees. Furthermore, processes affecting tree recruitment seem to be similar among populations regardless of their past disturbance regime. Our results suggest that constraints on tree line dynamics causing differential responses between sites may operate on older life stages and not upon recruits, and that such constraints may be more contingent on local site conditions than on disturbance history.John Wiley & Sons2010info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2445/225738Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésVersió postprint del document publicat a: https://doi.org/10.1111/j.1365-2699.2010.02348.xJournal of Biogeography, 2010, vol. 37, num.10, p. 1938-1950https://doi.org/10.1111/j.1365-2699.2010.02348.x(c) John Wiley & Sons, 2010info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/2257382026-05-27T06:46:51Z
dc.title.none.fl_str_mv Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regime
title Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regime
spellingShingle Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regime
Batllori Presas, Enric
Pins
Pirineus
Canvi mediambiental global
Pine
Pyrenees
Global environmental change
title_short Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regime
title_full Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regime
title_fullStr Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regime
title_full_unstemmed Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regime
title_sort Current regeneration patterns at treeline in the Pyrenees indicate similar recruitment processes irrespective of past disturbance regime
dc.creator.none.fl_str_mv Batllori Presas, Enric
Camarero Martínez, Jesús Julio
Gutiérrez Merino, Emilia
author Batllori Presas, Enric
author_facet Batllori Presas, Enric
Camarero Martínez, Jesús Julio
Gutiérrez Merino, Emilia
author_role author
author2 Camarero Martínez, Jesús Julio
Gutiérrez Merino, Emilia
author2_role author
author
dc.subject.none.fl_str_mv Pins
Pirineus
Canvi mediambiental global
Pine
Pyrenees
Global environmental change
topic Pins
Pirineus
Canvi mediambiental global
Pine
Pyrenees
Global environmental change
description Aim: Impacts of global change, such as land-use and climate changes, could produce significant alterations in the elevational patterns of alpine tree line ecotones and their adjacent vegetation zones. Because the responses of the tree line to environmental variations are directly related to successful tree regeneration, understanding recruitment dynamics is an indispensable step in tree line research. We aimed to compare potential ecological limitations on recent tree line regeneration in undisturbed and disturbed sites by analysing the demographic structure and spatiotemporal patterns of recruits and large trees. Location: Alpine tree line ecotones comprising Pinus uncinata in the Catalan Pyrenees (north-east Spain) and Andorra. Methods: We assessed the demographic structure and spatial pattern of recent recruitment using techniques of point-pattern and autocorrelation analyses. A total of 3639 P. uncinata individuals were mapped, measured and aged at 12 sites. To evaluate the effects of past disturbances on recent tree line response we compared tree lines that had either been recently affected by human-induced disturbances or had remained undisturbed for many years. Results: The age structure of the tree lines, together with the lack of an age gap between seedlings and saplings, did not indicate recent episodes of high seedling mortality and suggest that recruitment has been frequent under current climate conditions. Seedlings appeared highly aggregated at short distances (up to 3 m), irrespective of disturbance history, and were spatially segregated with respect to large trees. However, we found no evidence of patches of even-aged seedlings, and our results suggest that dispersal events at intermediate distances (10–17 m) may be frequent. Autocorrelation analyses revealed different patterns of density and age of recruits between disturbed and undisturbed tree lines, but the strength and small-scale clustering of seedlings and saplings were very similar between sites. Main conclusions: We found no recruitment limitation on recent tree line dynamics in the Pyrenees. Furthermore, processes affecting tree recruitment seem to be similar among populations regardless of their past disturbance regime. Our results suggest that constraints on tree line dynamics causing differential responses between sites may operate on older life stages and not upon recruits, and that such constraints may be more contingent on local site conditions than on disturbance history.
publishDate 2010
dc.date.none.fl_str_mv 2010
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/225738
url https://hdl.handle.net/2445/225738
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1111/j.1365-2699.2010.02348.x
Journal of Biogeography, 2010, vol. 37, num.10, p. 1938-1950
https://doi.org/10.1111/j.1365-2699.2010.02348.x
dc.rights.none.fl_str_mv (c) John Wiley & Sons, 2010
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) John Wiley & Sons, 2010
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv John Wiley & Sons
publisher.none.fl_str_mv John Wiley & Sons
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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