Genetic variation in populations of Gochnatia pulchra (Asteraceae) / Analise da variabilidade genetica em populações de Gochnatia pulchra (Asteraceae)

AUTOR(ES)

Joice Machado Bariani

DATA DE PUBLICAÇÃO

2007

RESUMO

The brazilian cerrado is one of the most threatened biomes of tropical savannas in the world, subject to habitat fragmentation, loss and degradation. Gochantia pulchra Kunth (Asteraceae, Mutisieae) is a perennial shrub species endemic and to the brazilian cerrado. Its commonly found in human disturbed cerrado sites. In the presente work, we studied eight populations of this species with allozyme markers, with the aim to analyze its genetic variation. We observed low levels of genetic variation, elevated inbreeding and moderate genetic structure between populations, indicating low levels of gene flow. For six out of eight populations, we studied the effect of habitat degradation on the genetic variation of populations. As a result, we observed that degradation and density showed a negative effect on the genetic variation on populations. These results highlight the impact of habitat degradation on this species, reducing the success of ecological interactions that are essential to the maintance of the genetic variation in these populations.

ASSUNTO(S)

isoenzimas isozymes degradação ambiental cerrados environmental degradation cerrados compostas gochnatia compositae gochnatia

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