Hieracium pilosella invasion in the Tierra del Fuego steppe, Southern Patagonia

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Biological invasions have important ecological impacts at both local and global levels, affecting biodiversity, ecosystem functioning, and economic sustainability. The study of invasions requires specific methodological approaches to gain rapid insight into the spatial and temporal dynamics of the s...

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Detalles Bibliográficos
Otros Autores: Cipriotti, Pablo Ariel, Rauber, Ruth B., Collantes, Marta Beatriz, Braun, Karen, Escartín, Celina
Formato: Artículo
Lenguaje:Inglés
Materias:
AUTOCORRELATION
GEOSTATISTICS
GRASSLANDS
HAWKWEED
PLANT INVASIONS
SHEEP GRAZING
SPATIAL STATISTICS
ANEMOCHORY
BARE SOIL
BIOLOGICAL INVASION
DICOTYLEDON
ECOLOGICAL IMPACT
ECOSYSTEM FUNCTION
ENVIRONMENTAL DISTURBANCE
ENVIRONMENTAL FACTOR
GEOGRAPHICAL DISTRIBUTION
GRAZING
HABITAT MANAGEMENT
HERB
INVASIVE SPECIES
LAND USE
SHEEP
SPATIOTEMPORAL ANALYSIS
STEPPE
ARGENTINA
ISLA GRANDE DE TIERRA DEL FUEGO
TIERRA DEL FUEGO [[ARC] SOUTH AMERICA]
ANIMALIA
ASTERACEAE
HIERACIUM
HIERACIUM PILOSELLA
OVIS ARIES
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2010Cipriotti2.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a Hieracium pilosella invasion in the Tierra del Fuego steppe, Southern Patagonia 
520 |a Biological invasions have important ecological impacts at both local and global levels, affecting biodiversity, ecosystem functioning, and economic sustainability. The study of invasions requires specific methodological approaches to gain rapid insight into the spatial and temporal dynamics of the system. We studied a recent invasion by the exotic herb Hieracium pilosella L. [Mouse-ear hawkweed, Asteraceae] in the Argentinean portion of the northern part of Tierra del Fuego Island in Southern Patagonia. To assess the extent of this invasion and the related ecological and land use factors, we performed an extensive field sampling at a regional scale and used a spatial pattern approach using geostatistical techniques to build a map of the invasion. Our results showed that the invading species is widely distributed across the entire Fuegian steppe, in general with low cover [less than 2 percent] and a particular spatial structure having hot spots [10-70 percent] related to specific land uses. We found regional-latitudinal and also local-community level variability in the frequency, cover and spatial distribution of the invasive species, each of them associated with particular ecological factors, and no association with regular domestic animal grazing. Region-wide invasion may be accounted for by wind dispersal of the seeds and the latitudinal variability of the precipitation; while local-variability was associated with the susceptibility of different plant communities to invasion. Hot spots were found to be related to massive soil disturbances [e. g., road building, shrub removal, physical impacts of long-term and intense domestic animal use, etc.], probably due to the presence of bare soil favoring colonization by the invading species. Scrublands, lawns and grasslands were more invaded than wetlands, heathlands or salt grasslands. Since the invasion is apparently at initial stages due to the low cover values found, we believe that information about the extent and environmental or management factors involved in this exotic plant's expansion should be used to design appropriate control and mitigation tools. In this sense, our results point to management actions focused on reducing the presence of hot spots of invasion by means of quick revegetation of bare soil after a massive disturbance event takes place. 
653 0 |a AUTOCORRELATION 
653 0 |a GEOSTATISTICS 
653 0 |a GRASSLANDS 
653 0 |a HAWKWEED 
653 0 |a PLANT INVASIONS 
653 0 |a SHEEP GRAZING 
653 0 |a SPATIAL STATISTICS 
653 0 |a ANEMOCHORY 
653 0 |a AUTOCORRELATION 
653 0 |a BARE SOIL 
653 0 |a BIOLOGICAL INVASION 
653 0 |a DICOTYLEDON 
653 0 |a ECOLOGICAL IMPACT 
653 0 |a ECOSYSTEM FUNCTION 
653 0 |a ENVIRONMENTAL DISTURBANCE 
653 0 |a ENVIRONMENTAL FACTOR 
653 0 |a GEOGRAPHICAL DISTRIBUTION 
653 0 |a GRAZING 
653 0 |a HABITAT MANAGEMENT 
653 0 |a HERB 
653 0 |a INVASIVE SPECIES 
653 0 |a LAND USE 
653 0 |a SHEEP 
653 0 |a SPATIOTEMPORAL ANALYSIS 
653 0 |a STEPPE 
653 0 |a ARGENTINA 
653 0 |a ISLA GRANDE DE TIERRA DEL FUEGO 
653 0 |a TIERRA DEL FUEGO [[ARC] SOUTH AMERICA] 
653 0 |a ANIMALIA 
653 0 |a ASTERACEAE 
653 0 |a HIERACIUM 
653 0 |a HIERACIUM PILOSELLA 
653 0 |a OVIS ARIES 
700 1 |9 20940  |a Cipriotti, Pablo Ariel 
700 1 |9 67636  |a Rauber, Ruth B. 
700 1 |a Collantes, Marta Beatriz  |9 25260 
700 1 |9 41813  |a Braun, Karen 
700 1 |a Escartín, Celina  |9 41814 
773 |t Biological Invasions  |g Vol.12, no.8 (2010), p.2523-2535 
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900 |a ^aCipriotti^bP.A.^tLaboratorio de Ecología de Pastizales, Museo Argentino de Ciencias Naturales, CONICET, Buenos Aires, Argentina 
900 |a ^aRauber^bR.B.^tCátedra de Métodos Cuantitativos Aplicados, Dpto. de Métodos Cuantitativos y Sistemas de Información, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina 
900 |a ^aCollantes^bM.B.^tDepartment Ã-kologische Systemanalyse, Helmholtz Zentrum für Umweltforschung, PermoserstraÃYe 15, 04318 Leipzig, Germany 
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900 |a HAWKWEED 
900 |a PLANT INVASIONS 
900 |a SHEEP GRAZING 
900 |a SPATIAL STATISTICS 
900 |a ANEMOCHORY 
900 |a AUTOCORRELATION 
900 |a BARE SOIL 
900 |a BIOLOGICAL INVASION 
900 |a DICOTYLEDON 
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900 |a ENVIRONMENTAL FACTOR 
900 |a GEOGRAPHICAL DISTRIBUTION 
900 |a GRAZING 
900 |a HABITAT MANAGEMENT 
900 |a HERB 
900 |a INVASIVE SPECIES 
900 |a LAND USE 
900 |a SHEEP 
900 |a SPATIOTEMPORAL ANALYSIS 
900 |a STEPPE 
900 |a ARGENTINA 
900 |a ISLA GRANDE DE TIERRA DEL FUEGO 
900 |a TIERRA DEL FUEGO [[ARC] SOUTH AMERICA] 
900 |a ANIMALIA 
900 |a ASTERACEAE 
900 |a HIERACIUM 
900 |a HIERACIUM PILOSELLA 
900 |a OVIS ARIES 
900 |a Biological invasions have important ecological impacts at both local and global levels, affecting biodiversity, ecosystem functioning, and economic sustainability. The study of invasions requires specific methodological approaches to gain rapid insight into the spatial and temporal dynamics of the system. We studied a recent invasion by the exotic herb Hieracium pilosella L. [Mouse-ear hawkweed, Asteraceae] in the Argentinean portion of the northern part of Tierra del Fuego Island in Southern Patagonia. To assess the extent of this invasion and the related ecological and land use factors, we performed an extensive field sampling at a regional scale and used a spatial pattern approach using geostatistical techniques to build a map of the invasion. Our results showed that the invading species is widely distributed across the entire Fuegian steppe, in general with low cover [less than 2 percent] and a particular spatial structure having hot spots [10-70 percent] related to specific land uses. We found regional-latitudinal and also local-community level variability in the frequency, cover and spatial distribution of the invasive species, each of them associated with particular ecological factors, and no association with regular domestic animal grazing. Region-wide invasion may be accounted for by wind dispersal of the seeds and the latitudinal variability of the precipitation; while local-variability was associated with the susceptibility of different plant communities to invasion. Hot spots were found to be related to massive soil disturbances [e. g., road building, shrub removal, physical impacts of long-term and intense domestic animal use, etc.], probably due to the presence of bare soil favoring colonization by the invading species. Scrublands, lawns and grasslands were more invaded than wetlands, heathlands or salt grasslands. Since the invasion is apparently at initial stages due to the low cover values found, we believe that information about the extent and environmental or management factors involved in this exotic plant's expansion should be used to design appropriate control and mitigation tools. In this sense, our results point to management actions focused on reducing the presence of hot spots of invasion by means of quick revegetation of bare soil after a massive disturbance event takes place. 
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