MODELOS DE DISTRIBUIÇÃO GEOGRÁFICA POTENCIAL: APLICAÇÃO COM PLANTAS AMEAÇADAS DE EXTINÇÃO DA FLORESTA ATLÂNTICA

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

ABSTRACT KAMINO, L.H.Y. (2009). Potential Models of Species Geographical Distribution: an essay with threatened species from Atlantic Forest. Ph.D. Thesis Instituto Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte. Advisor: João Renato Stehmann. Potential Models of Species Distribution have been used as important tools in conservation biology, producing maps of expected distribution of rare, endemic and threatened species. One of the most used algorithms is Maxent, that can predict distribution with a few occurrence data. The main goal of this work is to evaluate the predictive models generated by Maxent, as a tool to help finding new populations of plants threatened of extinction in the Atlantic Forest. In the first chapter two tree species with large extent of occurrence are evaluated (Melanoxylon brauna Schott e Dalbergia nigra (Vell.) Allemao ex Benth., Fabaceae), and the data of occurrence acquired from herbarium sheets were of low geographic precision. To generate the models were used the Maxent LPT and T10 methods. The resulting maps exhibit na acceptable approach of the species potential distribution, with less then 25 ocurrence data. The set rate for M. brauna was of 63% (LPT) and 83% (T10), and for D. nigra of 40% (LPT) and 75% (T10), respectively. According to the results of the field surveys, the maps generated by the T10 algorithm had a better accuracy than the LPTs. Considering the level of fragmentation and the history of over exploitation of the occurrence area of the species, they are both recommended to be maintained as Vunerable, according to IUCN criteria for threatened species. The second chapter evaluate the predictive model for one herb specie of restricted distribution (Petunia mantiqueirensis T. Ando &Hashim., xix Solanaceae), with only eight known registries, but with more precise references than the trees of the first chapter. The models showed a set rate of 87%, what are considered statistically significant. Nine new populations of P. mantiqueirensis were found in predicted areas of the model. The Potential Models of Geographical Distribution associated with field trips were useful to enlarge the knowledge about the occupancy area of threatened plant species. KEYWORDS: Potential Models of Species Geographical Distribution, Maxent, Threatened Species, Atlantic Forest, Melanoxylon brauna, Dalbergia nigra, Petunia mantiqueirensis.

ASSUNTO(S)

mata atlântica teses. petunias teses. melanoxylon brauna teses. plantas em extinção teses. dalbergia teses. botânica teses.

ACESSO AO ARTIGO

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