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Revista chilena de historia natural

versión impresa ISSN 0716-078X

Resumen

FIGUEROA, JAVIER A.  y  CASTRO, SERGIO A.. Effect of herbivores and pathogens on the survival and growth of seedlings in a fragment of the Chiloé rainforest, Chile. Rev. chil. hist. nat. [online]. 2000, vol.73, n.1, pp.163-173. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2000000100015.

The physical conditions of the environment, the attack of pathogen microorganisms, defoliating invertebrates and herbivores may affect the growth and survival of woody plant seedlings. Seedling growth, survival, proportion of damaged individuals by herbivores and pathogens, and the effect of these damages on seedling growth and survival were evaluated in this work. Seedling mortality was greater during summer. Two thirds of all seedlings presented some type of aggression when monitoring phase was over (11 months). Seedlings with cotyledons presented greater proportion of healthy individuals. Seedlings without cotyledons presented greater proportion of damaged individuals. The proportion of damaged individuals differed among species. Isolated seedlings of Amomyrtus luma presented greater proportion of damaged individuals. Isolated seedlings of Podocarpus nubigena presented same proportion of damaged and healthy individuals. Seedlings of Amomyrtus luma grouped with conspecifics presented greater proportion of healthy individuals than isolated seedlings of the same species. Seedlings of Podocarpus nubigena grouped were all damaged. On the other hand, mean shoot growth during the monitoring phase approached 12 mm in 11 months. It was not affected by sanitary state of the seedling. 62% of the seedling survived 11 months. 72% of the seedlings of Podocarpus nubigena survived the end of the monitoring phase, while 55% of the seedling of Amomyrtus luma survived. However, there are not significant differences in the seedling survival among species, between seedlings with and without cotyledons, and between healthy and damaged seedlings, to exception of the seedlings of Amomyrtus luma when they were not distinguished by age. In this last case survived a greater proportion of damaged seedlings of Amomyrtus luma. Results in the context of known defense theories in plants were discussed

Palabras clave : herbivore; pathogen; seedling; Chiloé; Chile.

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