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Occurrence of Schizolobium parahyba in seazonal semideciduous forest: molecular and dendrochronological approach


Schizolobium parahyba is a native tree of Atlantic Rain Forest and is classified as Seasonally Semideciduous Forest invader. Biological invasion is considered major ones causes of biodiversity loss. Invasive populations have different genetic patterns of establishment, as repetitive invasions, cryptic invasoin, introgression and hybridization. In this complex context, population mixtures can be a centerpiece in the successful establishment of invasive populations by favoring local adaptability and reducing inbreeding depression. Through the use of a new technique developed in this research based on Next-Generation Sequencing, Restriction-Site Associated DNA-Sequencing with four simultaneous enzymatic restriction, genetic parameters were detected, as relatedness, population substructure and variability and genetic differentiation measures of invasive and naturalized populations of this species. With nearly 5,000 polymorphic loci was possible to detect processes of population mixture and the particular dynamics of each studied area. There have been cases of exchange of genetic material between invasive and naturalized populations and evidences that human action intensifies the process of population mixture. Analyses of population substructure suggested that human action favored the formation of subpopulations in the study areas. The use of molecular markers with high informativeness proved to be a powerful tool for monitoring of invasive populations. (AU)

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