Exotic vs. native plant dominance over 20 years of old - field succession on set - aside farmland in Argentina

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Exotic plants are major constituents of species pools in modern landscapes. Managing succession for restoration of degraded ecosystems thus requires an understanding of novel trajectories unfolding in mixed, native/exotic plant assemblages. We examined trends in native and exotic species abundance o...

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Detalles Bibliográficos
Otros Autores: Tognetti, Pedro Maximiliano, Chaneton, Enrique José, Omacini, Marina, Trebino, Hernán Jorge, León, Rolando Juan Carlos
Formato: Artículo
Lenguaje:Inglés
Materias:
BIODIVERSITY
INLAND PAMPAS
INVASIONS
NOVEL ECOSYSTEMS
RESTORATION
SUCCESSIONAL NICHES
ABUNDANCE
BIOLOGICAL INVASION
CLUSTER ANALYSIS
CONSERVATION MANAGEMENT
DOMINANCE
ECOSYSTEM SERVICE
INVASIVE SPECIES
NATIVE SPECIES
NICHE
OLD FIELD
RESTORATION ECOLOGY
SET-ASIDE
SPECIES POOL
SPECIES RICHNESS
SUCCESSION
ARGENTINA
PAMPAS
POACEAE
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2010Tognetti.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 Exotic vs. native plant dominance over 20 years of old - field succession on set - aside farmland in Argentina 
520 |a Exotic plants are major constituents of species pools in modern landscapes. Managing succession for restoration of degraded ecosystems thus requires an understanding of novel trajectories unfolding in mixed, native/exotic plant assemblages. We examined trends in native and exotic species abundance over 20. years of old-field succession on set-aside farmland in the Inland Pampa, Argentina. Changes in plant cover and species richness were annually monitored on adjacent permanent plots established in different years [1978-1989]. Both native and exotic species occurred in early, mid and late successional stages, exhibiting similar life-form replacement patterns, from annual forbs, through annual to perennial grasses. Exotic plant richness declined with plot age. Yet, four exotic grasses remained dominant through succession [50-70 percent cover], with plots initiated in later years showing increased exotic cover. While native perennial grasses occurred from the onset of succession, increasing from 5 to 12. spp/plot, they only showed transient peaks below 30 percent cover. Cluster analysis of 113 plot-year samples identified alternative community states for early, mid and late successional stages, which were connected by a complex network of interweaving dynamic pathways. Depending on the plot, vegetation dynamics comprised directional temporal trajectories as well as nondirectional pathways, and arrested community states dominated by exotic grasses. Our results illustrate the overwhelming role of exotic species in modern old-field succession, and their potential to hinder recovery of native communities on former agricultural land. Community states with novel, native/exotic plant mixtures could be managed to deliver specific ecosystem services [e.g. forage production, carbon sequestration]. However, meeting conservation goals may require active restoration measures, including exotic plant removals and native grass seeding. 
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900 |a RESTORATION 
900 |a SUCCESSIONAL NICHES 
900 |a ABUNDANCE 
900 |a BIOLOGICAL INVASION 
900 |a CLUSTER ANALYSIS 
900 |a CONSERVATION MANAGEMENT 
900 |a DOMINANCE 
900 |a ECOSYSTEM SERVICE 
900 |a INVASIVE SPECIES 
900 |a NATIVE SPECIES 
900 |a NICHE 
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900 |a Exotic plants are major constituents of species pools in modern landscapes. Managing succession for restoration of degraded ecosystems thus requires an understanding of novel trajectories unfolding in mixed, native/exotic plant assemblages. We examined trends in native and exotic species abundance over 20. years of old-field succession on set-aside farmland in the Inland Pampa, Argentina. Changes in plant cover and species richness were annually monitored on adjacent permanent plots established in different years [1978-1989]. Both native and exotic species occurred in early, mid and late successional stages, exhibiting similar life-form replacement patterns, from annual forbs, through annual to perennial grasses. Exotic plant richness declined with plot age. Yet, four exotic grasses remained dominant through succession [50-70 percent cover], with plots initiated in later years showing increased exotic cover. While native perennial grasses occurred from the onset of succession, increasing from 5 to 12. spp/plot, they only showed transient peaks below 30 percent cover. Cluster analysis of 113 plot-year samples identified alternative community states for early, mid and late successional stages, which were connected by a complex network of interweaving dynamic pathways. Depending on the plot, vegetation dynamics comprised directional temporal trajectories as well as nondirectional pathways, and arrested community states dominated by exotic grasses. Our results illustrate the overwhelming role of exotic species in modern old-field succession, and their potential to hinder recovery of native communities on former agricultural land. Community states with novel, native/exotic plant mixtures could be managed to deliver specific ecosystem services [e.g. forage production, carbon sequestration]. However, meeting conservation goals may require active restoration measures, including exotic plant removals and native grass seeding. 
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