Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte

Autores
Pazos, Gustavo Enrique; Bisigato, Alejandro Jorge; Bertiller, Monica Beatriz
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We analysed the density, bunch size, and spatial patterning in relation to the shrubby matrix of the three dominant perennial grasses of the Patagonian Monte with different functional traits related to resource acquisition/conservation, mesophytism/xerophytism, and reproductive strategy. Field sampling was carried out at grazed (low and high grazing pressure) and excluded from grazing (15 years) sites. Grazing disturbance did not change the cover of the shrubby matrix but modified its spatial structure leading to increased density and reduced diameter of shrub patches. Changes in the abundance of perennial grass species among sites may be primarily attributed to a high direct effect of grazing on the species with the most mesophytic and acquisitive traits (N-rich green tissues, high leaf production, and low lignin concentration in leaves). Under grazing exclusion, this species was the most associated with shrub patches. The other perennial grass species either did not reduce or increased their abundance with grazing. The species with a mix of mesophytic and xerophytic traits was found with high frequency at inter-patch microsites. The most xerophytic and conservative species occupied vacant microsites either between shrub patches or at shrub-patch centres. However, the three species were increasingly concentrated under shrub canopies with increasing grazing pressure. This fact stresses the importance of shrub patches as biotic refuges for perennial grasses with low anti-herbivore defences.
Fil: Pazos, Gustavo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Bisigato, Alejandro Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Bertiller, Monica Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Materia
STRESS TOLERANCE
SHRUB PATCHES
ARID ECOSYSTEMS
FUNCTIONAL TRAITS
GRAZING REFUGES
PLANT DEFENCES
PREFERENCE BY HERBIVORES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/102790

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repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian MontePazos, Gustavo EnriqueBisigato, Alejandro JorgeBertiller, Monica BeatrizSTRESS TOLERANCESHRUB PATCHESARID ECOSYSTEMSFUNCTIONAL TRAITSGRAZING REFUGESPLANT DEFENCESPREFERENCE BY HERBIVOREShttps://purl.org/becyt/ford/4.5https://purl.org/becyt/ford/4We analysed the density, bunch size, and spatial patterning in relation to the shrubby matrix of the three dominant perennial grasses of the Patagonian Monte with different functional traits related to resource acquisition/conservation, mesophytism/xerophytism, and reproductive strategy. Field sampling was carried out at grazed (low and high grazing pressure) and excluded from grazing (15 years) sites. Grazing disturbance did not change the cover of the shrubby matrix but modified its spatial structure leading to increased density and reduced diameter of shrub patches. Changes in the abundance of perennial grass species among sites may be primarily attributed to a high direct effect of grazing on the species with the most mesophytic and acquisitive traits (N-rich green tissues, high leaf production, and low lignin concentration in leaves). Under grazing exclusion, this species was the most associated with shrub patches. The other perennial grass species either did not reduce or increased their abundance with grazing. The species with a mix of mesophytic and xerophytic traits was found with high frequency at inter-patch microsites. The most xerophytic and conservative species occupied vacant microsites either between shrub patches or at shrub-patch centres. However, the three species were increasingly concentrated under shrub canopies with increasing grazing pressure. This fact stresses the importance of shrub patches as biotic refuges for perennial grasses with low anti-herbivore defences.Fil: Pazos, Gustavo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Bisigato, Alejandro Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Bertiller, Monica Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaAcademic Press Ltd - Elsevier Science Ltd2007-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/102790Pazos, Gustavo Enrique; Bisigato, Alejandro Jorge; Bertiller, Monica Beatriz; Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte; Academic Press Ltd - Elsevier Science Ltd; Journal of Arid Environments; 70; 2; 7-2007; 316-3280140-1963CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.jaridenv.2006.12.025info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0140196307000237info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:31:45Zoai:ri.conicet.gov.ar:11336/102790instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:31:45.728CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte
title Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte
spellingShingle Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte
Pazos, Gustavo Enrique
STRESS TOLERANCE
SHRUB PATCHES
ARID ECOSYSTEMS
FUNCTIONAL TRAITS
GRAZING REFUGES
PLANT DEFENCES
PREFERENCE BY HERBIVORES
title_short Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte
title_full Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte
title_fullStr Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte
title_full_unstemmed Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte
title_sort Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte
dc.creator.none.fl_str_mv Pazos, Gustavo Enrique
Bisigato, Alejandro Jorge
Bertiller, Monica Beatriz
author Pazos, Gustavo Enrique
author_facet Pazos, Gustavo Enrique
Bisigato, Alejandro Jorge
Bertiller, Monica Beatriz
author_role author
author2 Bisigato, Alejandro Jorge
Bertiller, Monica Beatriz
author2_role author
author
dc.subject.none.fl_str_mv STRESS TOLERANCE
SHRUB PATCHES
ARID ECOSYSTEMS
FUNCTIONAL TRAITS
GRAZING REFUGES
PLANT DEFENCES
PREFERENCE BY HERBIVORES
topic STRESS TOLERANCE
SHRUB PATCHES
ARID ECOSYSTEMS
FUNCTIONAL TRAITS
GRAZING REFUGES
PLANT DEFENCES
PREFERENCE BY HERBIVORES
purl_subject.fl_str_mv https://purl.org/becyt/ford/4.5
https://purl.org/becyt/ford/4
dc.description.none.fl_txt_mv We analysed the density, bunch size, and spatial patterning in relation to the shrubby matrix of the three dominant perennial grasses of the Patagonian Monte with different functional traits related to resource acquisition/conservation, mesophytism/xerophytism, and reproductive strategy. Field sampling was carried out at grazed (low and high grazing pressure) and excluded from grazing (15 years) sites. Grazing disturbance did not change the cover of the shrubby matrix but modified its spatial structure leading to increased density and reduced diameter of shrub patches. Changes in the abundance of perennial grass species among sites may be primarily attributed to a high direct effect of grazing on the species with the most mesophytic and acquisitive traits (N-rich green tissues, high leaf production, and low lignin concentration in leaves). Under grazing exclusion, this species was the most associated with shrub patches. The other perennial grass species either did not reduce or increased their abundance with grazing. The species with a mix of mesophytic and xerophytic traits was found with high frequency at inter-patch microsites. The most xerophytic and conservative species occupied vacant microsites either between shrub patches or at shrub-patch centres. However, the three species were increasingly concentrated under shrub canopies with increasing grazing pressure. This fact stresses the importance of shrub patches as biotic refuges for perennial grasses with low anti-herbivore defences.
Fil: Pazos, Gustavo Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Bisigato, Alejandro Jorge. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
Fil: Bertiller, Monica Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; Argentina
description We analysed the density, bunch size, and spatial patterning in relation to the shrubby matrix of the three dominant perennial grasses of the Patagonian Monte with different functional traits related to resource acquisition/conservation, mesophytism/xerophytism, and reproductive strategy. Field sampling was carried out at grazed (low and high grazing pressure) and excluded from grazing (15 years) sites. Grazing disturbance did not change the cover of the shrubby matrix but modified its spatial structure leading to increased density and reduced diameter of shrub patches. Changes in the abundance of perennial grass species among sites may be primarily attributed to a high direct effect of grazing on the species with the most mesophytic and acquisitive traits (N-rich green tissues, high leaf production, and low lignin concentration in leaves). Under grazing exclusion, this species was the most associated with shrub patches. The other perennial grass species either did not reduce or increased their abundance with grazing. The species with a mix of mesophytic and xerophytic traits was found with high frequency at inter-patch microsites. The most xerophytic and conservative species occupied vacant microsites either between shrub patches or at shrub-patch centres. However, the three species were increasingly concentrated under shrub canopies with increasing grazing pressure. This fact stresses the importance of shrub patches as biotic refuges for perennial grasses with low anti-herbivore defences.
publishDate 2007
dc.date.none.fl_str_mv 2007-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/102790
Pazos, Gustavo Enrique; Bisigato, Alejandro Jorge; Bertiller, Monica Beatriz; Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte; Academic Press Ltd - Elsevier Science Ltd; Journal of Arid Environments; 70; 2; 7-2007; 316-328
0140-1963
CONICET Digital
CONICET
url http://hdl.handle.net/11336/102790
identifier_str_mv Pazos, Gustavo Enrique; Bisigato, Alejandro Jorge; Bertiller, Monica Beatriz; Abundance and spatial patterning of coexisting perennial grasses in grazed shrublands of the Patagonian Monte; Academic Press Ltd - Elsevier Science Ltd; Journal of Arid Environments; 70; 2; 7-2007; 316-328
0140-1963
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jaridenv.2006.12.025
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S0140196307000237
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Academic Press Ltd - Elsevier Science Ltd
publisher.none.fl_str_mv Academic Press Ltd - Elsevier Science Ltd
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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