Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditions

Canarian Juniper woodlands, now very scarce, are rich in endemic and endangered plants. However, many aspects of juniper regeneration are almost unknown. This paper relates occurrence and abundance of recruits of Juniperus turbinata ssp. canariensis to (1) small-scale soil characteristics; (2) veget...

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Autores: Otto, Rüdiger, Krüsi, Bertil O., Delgado, Juan Domingo, Fernández-Palacios, José María, García del Rey, Eduardo, Arévalo, José Ramón
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2010
País:España
Institución:Universidad de La Laguna (ULL)
Repositorio:RIULL. Repositorio Institucional de la Universidad de La Laguna
OAI Identifier:oai:riull.ull.es:915/18187
Acceso en línea:http://riull.ull.es/xmlui/handle/915/18187
Access Level:acceso embargado
Palabra clave:Juniperus turbinata ssp. canariensis
regeneration
microhabitat
GLM
Canary Islands
regeneración
Islas Canarias
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spelling Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditionsOtto, RüdigerKrüsi, Bertil O.Delgado, Juan DomingoFernández-Palacios, José MaríaGarcía del Rey, EduardoArévalo, José RamónJuniperus turbinata ssp. canariensisregenerationmicrohabitatGLMCanary IslandsregeneraciónIslas CanariasCanarian Juniper woodlands, now very scarce, are rich in endemic and endangered plants. However, many aspects of juniper regeneration are almost unknown. This paper relates occurrence and abundance of recruits of Juniperus turbinata ssp. canariensis to (1) small-scale soil characteristics; (2) vegetation cover; and (3) distance to conspecific adults in two contrasting juniper stands in the eastern mountains of Tenerife.We used non-parametric classification trees and generalised linear models (GLM) to evaluate the effect and importance of each explanatory variable on the occurrence of juniper saplings. Sapling density, vitality and growth rate, as well as fruit production by adult trees, but neither cone density on the ground nor sapling size, varied significantly with respect to slope orientation, representing environmental stress. Within each stand, distance to nearest adult tree was the most important variable explaining the spatial distribution of juniper saplings and availability of seeds in cones. Additionally, saplings were positively associated with shrub cover at the microsite-level, but not with spiny shrub cover. Soil depth and rock cover had a weak negative effect on sapling establishment, but only at the south-facing site and in the open space microhabitat. Results suggest that recruitment of Canarian juniper is facilitated by microhabitats offered by adults and shrubs. The key factors affecting recruitment are thought to be (1) favourable microenvironmental conditions and (2) high ambient seed availability. Browsing intensity in recent decades was very low. The presence of spiny shrubs did not favour juniper establishment. Facilitation therefore appears to result from amelioration of abiotic conditions rather than from protection against herbivory.Comunidad EuropeaSpringer Verlag202020202010info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://riull.ull.es/xmlui/handle/915/18187reponame:RIULL. Repositorio Institucional de la Universidad de La Lagunainstname:Universidad de La Laguna (ULL)InglésAnnals of Forest Science, Vol. 67, N. 7, 2010;LIFE04/NAT/ES/000064Attribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/embargoedAccessoai:riull.ull.es:915/181872026-06-22T13:13:57Z
dc.title.none.fl_str_mv Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditions
title Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditions
spellingShingle Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditions
Otto, Rüdiger
Juniperus turbinata ssp. canariensis
regeneration
microhabitat
GLM
Canary Islands
regeneración
Islas Canarias
title_short Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditions
title_full Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditions
title_fullStr Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditions
title_full_unstemmed Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditions
title_sort Regeneration niche of the Canarian juniper: the role of adults, shrubs and environmental conditions
dc.creator.none.fl_str_mv Otto, Rüdiger
Krüsi, Bertil O.
Delgado, Juan Domingo
Fernández-Palacios, José María
García del Rey, Eduardo
Arévalo, José Ramón
author Otto, Rüdiger
author_facet Otto, Rüdiger
Krüsi, Bertil O.
Delgado, Juan Domingo
Fernández-Palacios, José María
García del Rey, Eduardo
Arévalo, José Ramón
author_role author
author2 Krüsi, Bertil O.
Delgado, Juan Domingo
Fernández-Palacios, José María
García del Rey, Eduardo
Arévalo, José Ramón
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Juniperus turbinata ssp. canariensis
regeneration
microhabitat
GLM
Canary Islands
regeneración
Islas Canarias
topic Juniperus turbinata ssp. canariensis
regeneration
microhabitat
GLM
Canary Islands
regeneración
Islas Canarias
description Canarian Juniper woodlands, now very scarce, are rich in endemic and endangered plants. However, many aspects of juniper regeneration are almost unknown. This paper relates occurrence and abundance of recruits of Juniperus turbinata ssp. canariensis to (1) small-scale soil characteristics; (2) vegetation cover; and (3) distance to conspecific adults in two contrasting juniper stands in the eastern mountains of Tenerife.We used non-parametric classification trees and generalised linear models (GLM) to evaluate the effect and importance of each explanatory variable on the occurrence of juniper saplings. Sapling density, vitality and growth rate, as well as fruit production by adult trees, but neither cone density on the ground nor sapling size, varied significantly with respect to slope orientation, representing environmental stress. Within each stand, distance to nearest adult tree was the most important variable explaining the spatial distribution of juniper saplings and availability of seeds in cones. Additionally, saplings were positively associated with shrub cover at the microsite-level, but not with spiny shrub cover. Soil depth and rock cover had a weak negative effect on sapling establishment, but only at the south-facing site and in the open space microhabitat. Results suggest that recruitment of Canarian juniper is facilitated by microhabitats offered by adults and shrubs. The key factors affecting recruitment are thought to be (1) favourable microenvironmental conditions and (2) high ambient seed availability. Browsing intensity in recent decades was very low. The presence of spiny shrubs did not favour juniper establishment. Facilitation therefore appears to result from amelioration of abiotic conditions rather than from protection against herbivory.
publishDate 2010
dc.date.none.fl_str_mv 2010
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://riull.ull.es/xmlui/handle/915/18187
url http://riull.ull.es/xmlui/handle/915/18187
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Annals of Forest Science, Vol. 67, N. 7, 2010;
LIFE04/NAT/ES/000064
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/embargoedAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv embargoedAccess
dc.publisher.none.fl_str_mv Springer Verlag
publisher.none.fl_str_mv Springer Verlag
dc.source.none.fl_str_mv reponame:RIULL. Repositorio Institucional de la Universidad de La Laguna
instname:Universidad de La Laguna (ULL)
instname_str Universidad de La Laguna (ULL)
reponame_str RIULL. Repositorio Institucional de la Universidad de La Laguna
collection RIULL. Repositorio Institucional de la Universidad de La Laguna
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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