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vol.70 número1ONTOGENIA DEL FRUTO (PERICARPIO Y SEMILLA) DE ESPECIES DE SIDALÍQUENES EPÍFITOS EN EL PARQUE NACIONAL CONGUILLÍO, SUR DE CHILE índice de autoresíndice de materiabúsqueda de artículos
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Gayana. Botánica

versión On-line ISSN 0717-6643

Resumen

VALDIVIA, Carlos E  y  ROMERO, Cristian R. IN THE PATH OF EXTINCTION: THE CASE OF THE MESQUITE PROPOSIS CHILENSIS (FABACEAE) AND THE SPINY FOREST AT THE METROPOLITAN REGION OF CENTRAL CHILE. Gayana Bot. [online]. 2013, vol.70, n.1, pp.57-65. ISSN 0717-6643.  http://dx.doi.org/10.4067/S0717-66432013000100007.

At central Chile grows the spiny forest of Acacia caven and Prosopis chilensis of which less than 40% of its original surface currently persists, but with no representation into the wilderness protected areas. Owing to the action of cattle, has it been previously suggested a population reduction of P. chilensis coupled to a population increase of A. caven which, nonetheless, has not yet verified empirically. At four sites belonging to two micro-basins in the Metropolitan Region at central Chile (Batuco and Huechún), we assessed the incidence of environmental disturbances (cattle, rabbits, weeds, garbage), the phytosanitary stage, and population structure of P. chilensis, as well as the regeneration dynamics of this tree and A. caven by using Markovian transition matrices. Populations of P. chilensis suffer similar degrees of threats, exhibit a similar but depauperate phytosanitary stage and, consequently, they face a senescent stage prone to disappear when the current adult individuals go death. Furthermore, the population decrease of P. chilensis does not correlate with the previously suggested population increase of A. caven; hence, the tree species characterizing and defining the spiny forest of central Chile are prone to be extinct and with them the vegetation belt. It appears, therefore, as an urgent necessity the establishment of conservation and restoration programs in order to assure the persistence of the spiny forest at the Metropolitan Region in central Chile.

Palabras clave : Mesquites; espinos; environmental degradation; future extirpations.

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