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dc.contributor.author
Biancari, Lucio  
dc.contributor.author
Oñatibia, Gastón Rafael  
dc.contributor.author
Gaitán, Juan José  
dc.contributor.author
Aguiar, Martin Roberto  
dc.date.available
2023-12-11T15:24:09Z  
dc.date.issued
2023-02  
dc.identifier.citation
Biancari, Lucio; Oñatibia, Gastón Rafael; Gaitán, Juan José; Aguiar, Martin Roberto; Coexistence of grasses and shrubs in Patagonian steppes: Norm or exception?; Wiley Blackwell Publishing, Inc; Journal of Vegetation Science; 34; 1; 2-2023; 1-9  
dc.identifier.issn
1100-9233  
dc.identifier.uri
http://hdl.handle.net/11336/219801  
dc.description.abstract
Questions: (1) Is the co-dominance of grasses and shrubs a general feature of Patagonian steppes? (2) At a local scale, does it change with domestic grazing intensity or decadal changes in precipitation?. Locations: Question 1. Patagonia region in southern South America. Question 2. Shrub–grass steppes (45°24′S, 70°17′W) subjected to different grazing intensity for decades. Methods: We sampled vegetation to estimate perennial grass and shrub cover at two scales: regional and local. At the regional (phytogeographical) scale, we sampled grazed steppes under different climates and soils (n = 324 sites over ca. 487,000 km2). At the local scale, we sampled paddocks subjected to known grazing management, from commercial intensive densities of sheep to total (experimental) exclusion. Also, in the same site, we sampled permanent plots (25 years old) in a grazing exclosure to study the effects of precipitation variation. Results: Mixed communities are the predominant form of community organization in the Patagonia region. At the regional scale, shrub cover was negatively related to grass cover and communities where shrubs had higher cover than grasses represent 54% of the data set. At the local scale for an arid steppe, perennial grasses had higher cover than shrubs, regardless of grazing pressure. The shrub-to-grass ratio was increased only by intensive grazing. Permanent plots in a grazing-excluded paddock indicate that decadal xeric or humid climate periods decrease or increase total cover, respectively. Surprisingly, the relative shrub-to-grass ratio did not change significantly. Conclusions: Although perennial grasses and shrubs cover are negatively correlated, they coexist in the Patagonian steppes under a wide range of climate, soil and grazing conditions. At a local scale, selective herbivory promotes species replacement but did not substantially change the life-form covers. Water shortages, as well as periods of water surplus, similarly affect both life forms without compromising their coexistence.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Wiley Blackwell Publishing, Inc  
dc.rights
info:eu-repo/semantics/restrictedAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
GRAZING INTENSIFICATION  
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LIFE-FORM COMPOSITION  
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PATAGONIA REGION  
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PLANT COMMUNITY  
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PRECIPITATION VARIATION  
dc.subject.classification
Ecología  
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Ciencias Biológicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Coexistence of grasses and shrubs in Patagonian steppes: Norm or exception?  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2023-12-07T17:48:24Z  
dc.journal.volume
34  
dc.journal.number
1  
dc.journal.pagination
1-9  
dc.journal.pais
Reino Unido  
dc.journal.ciudad
Londres  
dc.description.fil
Fil: Biancari, Lucio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina  
dc.description.fil
Fil: Oñatibia, Gastón Rafael. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina  
dc.description.fil
Fil: Gaitán, Juan José. Universidad Nacional de Luján; Argentina. Instituto Nacional de Tecnología Agropecuaria. Centro de Investigación de Recursos Naturales. Instituto de Suelos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina  
dc.description.fil
Fil: Aguiar, Martin Roberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina  
dc.journal.title
Journal of Vegetation Science  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/10.1111/jvs.13177  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/jvs.13177