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
- Institución
- Universidad de Buenos Aires. Facultad de Agronomía
- OAI Identificador
- snrd:2011Golluscio
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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 |
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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 |
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openAccess |
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openAccess http://ri.agro.uba.ar/greenstone3/library/page/biblioteca#section4 |
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application/pdf |
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1001203 Chubut (province) ARG |
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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 |
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FAUBA Digital (UBA-FAUBA) |
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FAUBA Digital (UBA-FAUBA) |
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Universidad de Buenos Aires. Facultad de Agronomía |
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FAUBA Digital (UBA-FAUBA) - Universidad de Buenos Aires. Facultad de Agronomía |
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martino@agro.uba.ar;berasa@agro.uba.ar |
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