Cryptostegia madagascariensis Bojer ex Decne.: impacts on natural regeneration in fragments of caatinga.

Abstract

Invasive exotic species cause adverse changes in vegetal communities where they are established, leading the invaded areas to a lower ecological condition, with the loss of the biodiversity at the species and several ecological processes level. Based upon this finding, this research aimed to identify the impacts caused on the natural regeneration in remaining of caatinga invaded by Cryptostegia madagascariensis Bojer ex Decne. Three investigation areas were selected for the arrangement of this article, they were named by: Ambience I - infested area, Ambience II - the transition between areas I and III and the Ambience III - not infested area. For the inventory of the areas we employed the method of sampling points - Methods of Quadrants - being considered regenerant individuals with diameter at ground level (DNS) of less than 3 cm, regardless of height. Conventional phytosociological parameters were analyzed on the evaluation of the structure, beyond the diversity indices, of Equitability and Environmental Impact Exotic (IIAE). At the Ambience I, the abundance of invasive species has been performing negative effect on the ecological succession process, keeping the establishment of many native species, as it can be noticed by the evaluated parameters.