Morfometria geometrica e modelagem matematica em Lantana camara L. (Verbenaceae) / Mathematical modeling and mporphometric relations in the vegetative body of Lantana camara L. (Verbenaceae) in Brazil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The taxonomy of Lantana camara has been the target of discussion by taxonomists all over the world. The morphological, ecological and chemical plasticity observed is very extensive. Some autors consider that L. camara is a species complex instead of a monotypic taxon, composed of up to 150 different taxa. In this sudy, the variability of L. camara is studied using two methods: geometric morphology and mathmatical modelling. Morphological methods are used to analyze the morphological variability of the vegetative parts of brazilian populations. Brazil is within the native distribution for the species, which occurs over a large part of the Neotropics. The data analysis is made using multivariate methods to verify if there is any obvious morphological discontinuity within brazilian samples which would allow specific or insfraspecific taxa to be recognized. It does not appear to be possible to define reliable subdivisions within this taxon; in spite of the huge discrepancy among the more extreme samples, the measures are continuous. In the second chapter, a genetic algorithm (GARP) is used to draw a potential distribution map of the species over the world, based on occurrence points of Lantana camara in areas of the Neotropics where it is native. In spite of having an extremely widespread distribution in the Americas and other continents, no potencial occurrence is predicted for Australia and South Africa, two of the countries with the most active erradication programs for this species. It is inferred that the variants found in these countries may be taxonomically distant from the typical species, possibly resulting from horticultural hybridization and manipulation. A comprehensive review of the species at world level is necessary

ASSUNTO(S)

alometria algoritimos geneticos weeds genetic algorithms plantas invasoras pragas alometry alien plants

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