SciELO - Scientific Electronic Library Online

vol.15 número1Distribución de elementos traza en las aguas subterráneas del Partido de Escobar, Buenos Aires, ArgentinaCaracterísticas físico-químicas, capacidad buffer y establecimiento de la línea base ambiental del Río Grande, San Luis, Argentina índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




  • No hay articulos citadosCitado por SciELO

Links relacionados


Ecología austral

versión On-line ISSN 1667-782X


MOLINA-MONTENEGRO, Marco A; BADANO, Ernesto I; INOSTROZA, Patricia A  y  CAVIERES, Lohengrin A. Gas exchange in two high andean plant species of central Chile: effect of the association with cushion plants. Ecol. austral [online]. 2005, vol.15, n.1, pp.49-58. ISSN 1667-782X.

It has been proposed that on stressful environments as high mountain habitats, interactions between species of plants would tend to be of the positive type, increasing in intensity and frequency when resources in the environment become more limited. In this work, we studied the microclimatic modifications produced by cushions of Laretia acaulis species and its effects on the physiological performance of two associated species of the high mountain community located at 2800 m.a.s.l. in Los Andes of central Chile: Taraxacum officinale and Euphorbia collina, which frequently grow within and outside the cushions respectively. Gas exchange measures were taken in order to assess the effects caused by the microclimatic modifications done by cushions plants. We demonstrated that individuals of T. officinale that grow within cushions displayed, unlike their co-specifics in open spaces, a greater net photosynthesis rate. E. collina did not show differences in the rate of net photosynthesis between individuals present within and outside cushions. Only T. officinale displayed a greater rate of photosynthesis in the microsite where it is frequently distributed (within cushions). The effect of association with a nurse (e.g. cushion plants) for large biomass species, such as E. collina, could be less beneficial due to the competition for resources and space; this would explain why E. collina is more frequently found in open spaces.

Palabras clave : Net photosynthesis rates; Andes; Facilitation; Ecophysiology; Nurse effect.

        · resumen en Español     · texto en Español     · Español ( pdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons