NÚMERO DE POPULAÇÕES PARA CONSERVAÇÃO GENÉTICA IN SITU DE ESPÉCIES ARBÓREAS

Abstract

This work aims to recommend the population number for genetic conservation of forest tree species. Admitting populations in Hardy-Weinberg Equilibrium - HWE, sampling size estimations were calculated based on probabilistic measures. They were considered different allelic frequencies and their proportion of occurrences in populations of a species, at common, widespread alleles; common, local; rare, widespread, and rare, local. The sampling of the common alleles (q > 0.05) and wide occurrence in populations of species (occurring at least 25% of populations) depends on within populations sampling intensity. Five to three populations sampling in HWE can conserve, at 95% of probability, common alleles (q > 0.05) that occurnng in 50% to 75% of populations of a species, if 30 individuais were maintained per population. Sampling of common alleles (q > 0.05) of restrict occurrence in populations (occurring in less 25% of populations) depends on number of populations sampled and sampling intensity within populations. Fourteen populations sampled can conserve these alleles, at 95% of probability, if 30 individuais were. maintained per population. To conserve very rare ali eles (p = 0.01 ), of localized occurrence, for example, occurring in 20% of populations, 32 populations are necessary.