Exotic plant invasions to the mediterranean region of Chile: causes, history and impacts

We review the literature on patterns, causes, processes and impacts of exotic plants, primarily in the mediterranean region of Chile, considering three major non-independent drivers of the invasion process: (a) Availability of exotic species propagules, (b) attributes of the local communities in whi...

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Autores principales:	FIGUEROA,JAVIER A., CASTRO,SERGIO A., MARQUET,PABLO A., JAKSIC,FABIAN M.
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2004
Materias:	exotic species plant invasions naturalized plants invasion history ecosystem disruption
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300006
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spelling	oai:scielo:S0716-078X20040003000062004-10-21Exotic plant invasions to the mediterranean region of Chile: causes, history and impactsFIGUEROA,JAVIER A.CASTRO,SERGIO A.MARQUET,PABLO A.JAKSIC,FABIAN M. exotic species plant invasions naturalized plants invasion history ecosystem disruption We review the literature on patterns, causes, processes and impacts of exotic plants, primarily in the mediterranean region of Chile, considering three major non-independent drivers of the invasion process: (a) Availability of exotic species propagules, (b) attributes of the local communities in which exotic species establish and through which they will eventually spread out, and (c) attributes of exotic species that either facilitate or constraint their spread into new sites. Regarding availability of propagules, central Chile matorral presents the communities with the greatest incidence of naturalized herbs, followed by the sclerophyllous forest and the espinal scrubland in the coastal range. In contrast, north-central communities have lower numbers and proportions of naturalized species of herbs in their seed banks. Availability and persistence of naturalized herbs do not differ between aboveground vegetation and seed bank. Regarding attributes of local communities associated with the establishment and the spread of exotics, grazing regime and land use emerge as the most prominent causes that render them more prone to invasion by exotics. Evidence on the effect of the fire regime is contradictory and native species richness does not seem to be an important factor. Regarding attributes of exotic species, results suggest that naturalized annuals germinate within a wide temperature range, are highly resistant to cold and dry conditions, and show some degree of physiological dormancy. Additionally, naturalized annuals are highly tolerant to poor soils, but are generally intolerant to shade. These general attributes have largely determined the invasion process in the mediterranean region of Chile. Historical data indicate that an important number of exotic species were intentionally introduced, and that the spread of exotic is uncontrolled. It has been demonstrated that arrival time of exotics is of great relevance to understand present day spread of exotics in Chile, independent of their biogeographic origin. Exotic species may cause strong disruptions of ecosystem processes and functions in Chile, as exemplified by exotic tree plantations, which have altered soil chemistry, nutrient cycling, water cycle, hydrology, microclimate, and fire frequency and intensityinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.77 n.3 20042004-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300006en10.4067/S0716-078X2004000300006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	exotic species plant invasions naturalized plants invasion history ecosystem disruption
spellingShingle	exotic species plant invasions naturalized plants invasion history ecosystem disruption FIGUEROA,JAVIER A. CASTRO,SERGIO A. MARQUET,PABLO A. JAKSIC,FABIAN M. Exotic plant invasions to the mediterranean region of Chile: causes, history and impacts
description	We review the literature on patterns, causes, processes and impacts of exotic plants, primarily in the mediterranean region of Chile, considering three major non-independent drivers of the invasion process: (a) Availability of exotic species propagules, (b) attributes of the local communities in which exotic species establish and through which they will eventually spread out, and (c) attributes of exotic species that either facilitate or constraint their spread into new sites. Regarding availability of propagules, central Chile matorral presents the communities with the greatest incidence of naturalized herbs, followed by the sclerophyllous forest and the espinal scrubland in the coastal range. In contrast, north-central communities have lower numbers and proportions of naturalized species of herbs in their seed banks. Availability and persistence of naturalized herbs do not differ between aboveground vegetation and seed bank. Regarding attributes of local communities associated with the establishment and the spread of exotics, grazing regime and land use emerge as the most prominent causes that render them more prone to invasion by exotics. Evidence on the effect of the fire regime is contradictory and native species richness does not seem to be an important factor. Regarding attributes of exotic species, results suggest that naturalized annuals germinate within a wide temperature range, are highly resistant to cold and dry conditions, and show some degree of physiological dormancy. Additionally, naturalized annuals are highly tolerant to poor soils, but are generally intolerant to shade. These general attributes have largely determined the invasion process in the mediterranean region of Chile. Historical data indicate that an important number of exotic species were intentionally introduced, and that the spread of exotic is uncontrolled. It has been demonstrated that arrival time of exotics is of great relevance to understand present day spread of exotics in Chile, independent of their biogeographic origin. Exotic species may cause strong disruptions of ecosystem processes and functions in Chile, as exemplified by exotic tree plantations, which have altered soil chemistry, nutrient cycling, water cycle, hydrology, microclimate, and fire frequency and intensity
author	FIGUEROA,JAVIER A. CASTRO,SERGIO A. MARQUET,PABLO A. JAKSIC,FABIAN M.
author_facet	FIGUEROA,JAVIER A. CASTRO,SERGIO A. MARQUET,PABLO A. JAKSIC,FABIAN M.
author_sort	FIGUEROA,JAVIER A.
title	Exotic plant invasions to the mediterranean region of Chile: causes, history and impacts
title_short	Exotic plant invasions to the mediterranean region of Chile: causes, history and impacts
title_full	Exotic plant invasions to the mediterranean region of Chile: causes, history and impacts
title_fullStr	Exotic plant invasions to the mediterranean region of Chile: causes, history and impacts
title_full_unstemmed	Exotic plant invasions to the mediterranean region of Chile: causes, history and impacts
title_sort	exotic plant invasions to the mediterranean region of chile: causes, history and impacts
publisher	Sociedad de Biología de Chile
publishDate	2004
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300006
work_keys_str_mv	AT figueroajaviera exoticplantinvasionstothemediterraneanregionofchilecauseshistoryandimpacts AT castrosergioa exoticplantinvasionstothemediterraneanregionofchilecauseshistoryandimpacts AT marquetpabloa exoticplantinvasionstothemediterraneanregionofchilecauseshistoryandimpacts AT jaksicfabianm exoticplantinvasionstothemediterraneanregionofchilecauseshistoryandimpacts
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Exotic plant invasions to the mediterranean region of Chile: causes, history and impacts

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