Grazing - induced losses of biodiversity affect the transpiration of an arid ecosystem

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Degradation processes often lead to species loss. Such losses would impact on ecosystem functioning depending on the extinction order and the functional and structural aspects of species. For the Patagonian arid steppe, we used a simulation model to study the effects of species loss on the rate and...

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Detalles Bibliográficos
Autor principal: Verón, Santiago Ramón
Otros Autores: Paruelo, José María, Oesterheld, Martín
Formato: Artículo
Lenguaje:Inglés
Materias:
GRAZING
ORDER OF EXTINCTION
TRANSPIRATION
VARIABILITY
WATER
ARID ENVIRONMENT
DEGRADATION
ECOSYSTEM FUNCTION
EXTINCTION RISK
FUNCTIONAL CHANGE
OVERGRAZING
SPECIES RICHNESS
STEPPE
ANIMAL
BIODIVERSITY
BIOLOGICAL MODEL
BIOMASS
CLASSIFICATION
CLIMATE
ECOSYSTEM
FOOD CHAIN
GROWTH, DEVELOPMENT AND AGING
METABOLISM
PLANT
POPULATION DENSITY
POPULATION DYNAMICS
SOIL
SPECIES DIFFERENCE
ANIMALS
MODELS, BIOLOGICAL
PLANTS
SPECIES SPECIFICITY
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Veron.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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520 |a Degradation processes often lead to species loss. Such losses would impact on ecosystem functioning depending on the extinction order and the functional and structural aspects of species. For the Patagonian arid steppe, we used a simulation model to study the effects of species loss on the rate and variability [i. e. stability] of transpiration as a key attribute of ecosystem functioning. We addressed [1] the differences between the overgrazing extinction order and other potential orders, and [2] the role of biomass abundance, biomass distribution, and functional diversity on the effect of species loss due to overgrazing. We considered a community composed of ten species which were assigned an order of extinction due to overgrazing based on their preference by livestock. We performed four model simulations to test for overgrazing effects through different combinations of species loss, and reductions of biomass and functional diversity. In general, transpiration rate and variability were positively associated to species richness and remained fairly constant until half the species were lost by overgrazing. The extinction order by overgrazing was the most conservative of all possible orders. The amount of biomass was more important than functional diversity in accounting for the impacts of species richness on transpiration. Our results suggest that, to prevent Patagonian steppes from shifting to stable, low-production systems [by overgrazing], maintaining community biomass is more important than preserving species richness or species functional diversity. 
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900 |a ^aVerón, S.R.^tLaboratorio de Análisis Regional y Teledetección, Departamento de Métodos Cuantitativos y Sistemas de Información, IFEVA, Facultad de Agronomía, Universidad de Buenos Aires and CONICET, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina 
900 |a ^aParuelo, J.M.^tInstituto de Clima y Agua, Instituto Nacional de Tecnología Agropecuaria [INTA], Castelar, Buenos Aires, Argentina 
900 |a ^aOesterheld, M.^tLaboratorio de Análisis Regional y Teledetección, IFEVA, Cátedra de Ecología, Facultad de Agronomía, Universidad de Buenos Aires and CONICET, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina 
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900 |a WATER 
900 |a ARID ENVIRONMENT 
900 |a DEGRADATION 
900 |a ECOSYSTEM FUNCTION 
900 |a EXTINCTION RISK 
900 |a FUNCTIONAL CHANGE 
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900 |a SPECIES RICHNESS 
900 |a STEPPE 
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