Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?

Autores
Golluscio, Rodolfo Angel; Cavagnaro, Fernando Pablo; Valenta, Magalí Débora
Año de publicación
2011
Idioma
español castellano
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fil: Golluscio, Rodolfo Angel. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Forrajicultura. Buenos Aires, Argentina.
Fil: Golluscio, Rodolfo Angel. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Golluscio, Rodolfo Angel. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Cavagnaro, Fernando Pablo. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Forrajicultura. Buenos Aires, Argentina.
Fil: Valenta, Magalí Débora. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Producción Ovina. Buenos Aires, Argentina.
Fil: Valenta, Magalí Débora. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Valenta, Magalí Débora. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Features that confer plants tolerance to drought also provide tolerance to herbivory. Therefore, even the plants of arid zones with a short grazing history would be tolerant to herbivory. Evolutionary history of grazing in central and northwest Patagonian steppes has been considered brief and dominant spiny shrubs have been considered adapted to tolerate drought. Here, we present experimental evidences that question that conceptual model. (1) The three most conspicuous shrubs in the dominant community at south-western Chubut (Mulinum spinosum, Adesmia volckmanni and Senecio filaginoides) are not subjected to severe water stress conditions because their roots explore deep soil layers with relatively high water potentials almost all year. That is reflected in high leaf water potential, high isotopic discrimination against heavy carbon isotope and low response to rainfall. (2) Instead, the three shrubs show evasion herbivory strategies. M. spinosum and A. volckmanni have very aggressive thorns, while S. filaginoides has a high content of carbon-based secondary metabolites. These chemical compounds are believed to have an anti-herbivory role. Besides that, in two of these three species, levels of physical or chemical defences were increased under grazing conditions. (3) Finally, as defensive strategies do not preclude herbivore consumption in absolute terms, shrubs are important components of sheep diet. Sheeps eat leaves of non-chemically defended species and flowers of all of them. These evidences suggest that grazing pressure of native herbivores would have been high and persistent enough to promote natural selection processes that conducted to dominance of grazing resistant shrub genotypes.
Fuente
Ecología austral
Vol.21, no.1
61-70
https://asaeargentina.com.ar
Materia
DESERTIFICATION
HERBIVORY
WATER STRESS
WOODY PLANTS
ANTIHERBIVORE DEFENSE
ARID ENVIRONMENT
CARBON ISOTOPE
CHEMICAL DEFENSE
DESERTIFICATION
DOMINANCE
DROUGHT RESISTANCE
EXPERIMENTAL STUDY
GENOTYPE
GRAZING
GRAZING PRESSURE
ISOTOPIC COMPOSITION
MORPHOLOGY
NATURAL SELECTION
PLANT COMMUNITY
PRECIPITATION INTENSITY
ROOT SYSTEM
SECONDARY METABOLITE
SHEEP
SHRUB
SOIL WATER POTENTIAL
STEPPE
WATER STRESS
WOODY PLANT
PATAGONIA
ADESMIA VOLCKMANNII
MULINUM SPINOSUM
OVIS ARIES
SENECIO
SENECIO FILAGINOIDES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
acceso abierto
Repositorio
FAUBA Digital (UBA-FAUBA)
Institución
Universidad de Buenos Aires. Facultad de Agronomía
OAI Identificador
snrd:2011Golluscio

id FAUBA_902ea79a03ca8255968e0b2d5a134152
oai_identifier_str snrd:2011Golluscio
network_acronym_str FAUBA
repository_id_str 2729
network_name_str FAUBA Digital (UBA-FAUBA)
spelling Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?Golluscio, Rodolfo AngelCavagnaro, Fernando PabloValenta, Magalí DéboraDESERTIFICATIONHERBIVORYWATER STRESSWOODY PLANTSANTIHERBIVORE DEFENSEARID ENVIRONMENTCARBON ISOTOPECHEMICAL DEFENSEDESERTIFICATIONDOMINANCEDROUGHT RESISTANCEEXPERIMENTAL STUDYGENOTYPEGRAZINGGRAZING PRESSUREISOTOPIC COMPOSITIONMORPHOLOGYNATURAL SELECTIONPLANT COMMUNITYPRECIPITATION INTENSITYROOT SYSTEMSECONDARY METABOLITESHEEPSHRUBSOIL WATER POTENTIALSTEPPEWATER STRESSWOODY PLANTPATAGONIAADESMIA VOLCKMANNIIMULINUM SPINOSUMOVIS ARIESSENECIOSENECIO FILAGINOIDESFil: Golluscio, Rodolfo Angel. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Forrajicultura. Buenos Aires, Argentina.Fil: Golluscio, Rodolfo Angel. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.Fil: Golluscio, Rodolfo Angel. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.Fil: Cavagnaro, Fernando Pablo. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Forrajicultura. Buenos Aires, Argentina.Fil: Valenta, Magalí Débora. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Producción Ovina. Buenos Aires, Argentina.Fil: Valenta, Magalí Débora. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.Fil: Valenta, Magalí Débora. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.Features that confer plants tolerance to drought also provide tolerance to herbivory. Therefore, even the plants of arid zones with a short grazing history would be tolerant to herbivory. Evolutionary history of grazing in central and northwest Patagonian steppes has been considered brief and dominant spiny shrubs have been considered adapted to tolerate drought. Here, we present experimental evidences that question that conceptual model. (1) The three most conspicuous shrubs in the dominant community at south-western Chubut (Mulinum spinosum, Adesmia volckmanni and Senecio filaginoides) are not subjected to severe water stress conditions because their roots explore deep soil layers with relatively high water potentials almost all year. That is reflected in high leaf water potential, high isotopic discrimination against heavy carbon isotope and low response to rainfall. (2) Instead, the three shrubs show evasion herbivory strategies. M. spinosum and A. volckmanni have very aggressive thorns, while S. filaginoides has a high content of carbon-based secondary metabolites. These chemical compounds are believed to have an anti-herbivory role. Besides that, in two of these three species, levels of physical or chemical defences were increased under grazing conditions. (3) Finally, as defensive strategies do not preclude herbivore consumption in absolute terms, shrubs are important components of sheep diet. Sheeps eat leaves of non-chemically defended species and flowers of all of them. These evidences suggest that grazing pressure of native herbivores would have been high and persistent enough to promote natural selection processes that conducted to dominance of grazing resistant shrub genotypes.2011articleinfo:eu-repo/semantics/articlepublishedVersioninfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfissn:0327-5477http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2011GolluscioEcología australVol.21, no.161-70https://asaeargentina.com.arreponame:FAUBA Digital (UBA-FAUBA)instname:Universidad de Buenos Aires. Facultad de Agronomíaspa1001203Chubut (province)ARGinfo:eu-repo/semantics/openAccessopenAccesshttp://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section42025-09-29T13:41:34Zsnrd:2011Golluscioinstacron:UBA-FAUBAInstitucionalhttp://ri.agro.uba.ar/Universidad públicaNo correspondehttp://ri.agro.uba.ar/greenstone3/oaiserver?verb=ListSetsmartino@agro.uba.ar;berasa@agro.uba.ar ArgentinaNo correspondeNo correspondeNo correspondeopendoar:27292025-09-29 13:41:35.114FAUBA Digital (UBA-FAUBA) - Universidad de Buenos Aires. Facultad de Agronomíafalse
dc.title.none.fl_str_mv Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?
title Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?
spellingShingle Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?
Golluscio, Rodolfo Angel
DESERTIFICATION
HERBIVORY
WATER STRESS
WOODY PLANTS
ANTIHERBIVORE DEFENSE
ARID ENVIRONMENT
CARBON ISOTOPE
CHEMICAL DEFENSE
DESERTIFICATION
DOMINANCE
DROUGHT RESISTANCE
EXPERIMENTAL STUDY
GENOTYPE
GRAZING
GRAZING PRESSURE
ISOTOPIC COMPOSITION
MORPHOLOGY
NATURAL SELECTION
PLANT COMMUNITY
PRECIPITATION INTENSITY
ROOT SYSTEM
SECONDARY METABOLITE
SHEEP
SHRUB
SOIL WATER POTENTIAL
STEPPE
WATER STRESS
WOODY PLANT
PATAGONIA
ADESMIA VOLCKMANNII
MULINUM SPINOSUM
OVIS ARIES
SENECIO
SENECIO FILAGINOIDES
title_short Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?
title_full Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?
title_fullStr Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?
title_full_unstemmed Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?
title_sort Arbustos de la estepa patagónica : ¿adaptados a tolerar la sequía o el pastoreo?
dc.creator.none.fl_str_mv Golluscio, Rodolfo Angel
Cavagnaro, Fernando Pablo
Valenta, Magalí Débora
author Golluscio, Rodolfo Angel
author_facet Golluscio, Rodolfo Angel
Cavagnaro, Fernando Pablo
Valenta, Magalí Débora
author_role author
author2 Cavagnaro, Fernando Pablo
Valenta, Magalí Débora
author2_role author
author
dc.subject.none.fl_str_mv DESERTIFICATION
HERBIVORY
WATER STRESS
WOODY PLANTS
ANTIHERBIVORE DEFENSE
ARID ENVIRONMENT
CARBON ISOTOPE
CHEMICAL DEFENSE
DESERTIFICATION
DOMINANCE
DROUGHT RESISTANCE
EXPERIMENTAL STUDY
GENOTYPE
GRAZING
GRAZING PRESSURE
ISOTOPIC COMPOSITION
MORPHOLOGY
NATURAL SELECTION
PLANT COMMUNITY
PRECIPITATION INTENSITY
ROOT SYSTEM
SECONDARY METABOLITE
SHEEP
SHRUB
SOIL WATER POTENTIAL
STEPPE
WATER STRESS
WOODY PLANT
PATAGONIA
ADESMIA VOLCKMANNII
MULINUM SPINOSUM
OVIS ARIES
SENECIO
SENECIO FILAGINOIDES
topic DESERTIFICATION
HERBIVORY
WATER STRESS
WOODY PLANTS
ANTIHERBIVORE DEFENSE
ARID ENVIRONMENT
CARBON ISOTOPE
CHEMICAL DEFENSE
DESERTIFICATION
DOMINANCE
DROUGHT RESISTANCE
EXPERIMENTAL STUDY
GENOTYPE
GRAZING
GRAZING PRESSURE
ISOTOPIC COMPOSITION
MORPHOLOGY
NATURAL SELECTION
PLANT COMMUNITY
PRECIPITATION INTENSITY
ROOT SYSTEM
SECONDARY METABOLITE
SHEEP
SHRUB
SOIL WATER POTENTIAL
STEPPE
WATER STRESS
WOODY PLANT
PATAGONIA
ADESMIA VOLCKMANNII
MULINUM SPINOSUM
OVIS ARIES
SENECIO
SENECIO FILAGINOIDES
dc.description.none.fl_txt_mv Fil: Golluscio, Rodolfo Angel. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Forrajicultura. Buenos Aires, Argentina.
Fil: Golluscio, Rodolfo Angel. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Golluscio, Rodolfo Angel. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Cavagnaro, Fernando Pablo. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Forrajicultura. Buenos Aires, Argentina.
Fil: Valenta, Magalí Débora. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Producción Ovina. Buenos Aires, Argentina.
Fil: Valenta, Magalí Débora. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Fil: Valenta, Magalí Débora. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
Features that confer plants tolerance to drought also provide tolerance to herbivory. Therefore, even the plants of arid zones with a short grazing history would be tolerant to herbivory. Evolutionary history of grazing in central and northwest Patagonian steppes has been considered brief and dominant spiny shrubs have been considered adapted to tolerate drought. Here, we present experimental evidences that question that conceptual model. (1) The three most conspicuous shrubs in the dominant community at south-western Chubut (Mulinum spinosum, Adesmia volckmanni and Senecio filaginoides) are not subjected to severe water stress conditions because their roots explore deep soil layers with relatively high water potentials almost all year. That is reflected in high leaf water potential, high isotopic discrimination against heavy carbon isotope and low response to rainfall. (2) Instead, the three shrubs show evasion herbivory strategies. M. spinosum and A. volckmanni have very aggressive thorns, while S. filaginoides has a high content of carbon-based secondary metabolites. These chemical compounds are believed to have an anti-herbivory role. Besides that, in two of these three species, levels of physical or chemical defences were increased under grazing conditions. (3) Finally, as defensive strategies do not preclude herbivore consumption in absolute terms, shrubs are important components of sheep diet. Sheeps eat leaves of non-chemically defended species and flowers of all of them. These evidences suggest that grazing pressure of native herbivores would have been high and persistent enough to promote natural selection processes that conducted to dominance of grazing resistant shrub genotypes.
description Fil: Golluscio, Rodolfo Angel. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Producción Animal. Cátedra de Forrajicultura. Buenos Aires, Argentina.
publishDate 2011
dc.date.none.fl_str_mv 2011
dc.type.none.fl_str_mv article
info:eu-repo/semantics/article
publishedVersion
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 issn:0327-5477
http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2011Golluscio
identifier_str_mv issn:0327-5477
url http://ri.agro.uba.ar/greenstone3/library/collection/arti/document/2011Golluscio
dc.language.none.fl_str_mv spa
language spa
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
openAccess
http://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section4
eu_rights_str_mv openAccess
rights_invalid_str_mv openAccess
http://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section4
dc.format.none.fl_str_mv application/pdf
dc.coverage.none.fl_str_mv 1001203
Chubut (province)
ARG
dc.source.none.fl_str_mv Ecología austral
Vol.21, no.1
61-70
https://asaeargentina.com.ar
reponame:FAUBA Digital (UBA-FAUBA)
instname:Universidad de Buenos Aires. Facultad de Agronomía
reponame_str FAUBA Digital (UBA-FAUBA)
collection FAUBA Digital (UBA-FAUBA)
instname_str Universidad de Buenos Aires. Facultad de Agronomía
repository.name.fl_str_mv FAUBA Digital (UBA-FAUBA) - Universidad de Buenos Aires. Facultad de Agronomía
repository.mail.fl_str_mv martino@agro.uba.ar;berasa@agro.uba.ar
_version_ 1844618858010247168
score 13.070432