biogeografia do gênero mikania willd. (asteraceae) no rio grande do sul, brasil biogeography of the genus mikania willd. (asteraceae) in rio grande do sul, brazil

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ID: 259406
2004
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Abstract
A distribuição geográfica das 39 espécies nativas de Mikania Willd. no Rio Grande do Sul foi estudada em duas escalas: uma escala regional, utilizando regiões fisiográficas como unidades, e uma escala continental, considerando regiões político-geográficas como unidades. A riqueza específica e a amplitude de distribuiçãoforam obtidas diretamente de matrizes de presença e ausência, relacionando espécies e regiões. A matriz regional foi analisada por dois métodos multivariados, uma análise de agrupamentos e uma análise de coordenadas principais, utilizando o complemento do coeficiente de Jaccard como elemento de comparação (dissimilaridade). Na escala regional as regiões mais ricas foram o Litoral e a Depressão Central, enquanto na escala continental, a maioria das espécies sul-rio-grandenses foram também encontradas no Sudeste do Brasil e no Sul da América do Sul. A análise multivariada evidenciou dois grupos principais no Estado, um oriental e outro ocidental. Em cada um desses grupos foram evidenciados dois subgrupos relacionados a características climáticas e geológicas do Estado.Os padrões de distribuição de Mikania confirmam o caráter tropical do gênero e as principais rotas de migração descritas para a flora do Sul do Brasil.
The geographical distribution of the 39 species of Mikania Willd. native in Rio Grande do Sul was studied at two scales: a state-regional scale, using physiographic regions as units, and an american-continental scale, considering politic-geographic regions as units. Specific richness and distribution amplitude were obtained directly from presence and absence matrixes, relating species and regions. The state-regional matrix was also analysed by two multivariate methods, a cluster analysis and a principal coordinate analysis, using the complement of the Jaccard coefficient as a measure of dissimilarity. At the state-regional scale, the richest regions were the Coastal Plain and the Central Depression, whereas at the american-continental scale, most of the South Riograndean species were also found in Southeastern Brazil and Southern South America. The multivariate analysis evidenced two main groups in Rio Grande do Sul, one eastern and another western. Within each of these groups, two subgroups related to climatic and geological features were evidenced. The distribution patterns of Mikania confirm the tropical character of the genus, and the main migration routes described for the southern Brazilian vascular flora.
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Authors Mara Rejane Ritter, Jorge Luiz Waechter
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Journal monatshefte für chemie chemical monthly
Year 2004
DOI
10.1590/S0102-33062004000300021
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062004000300021
Keywords
Asteraceae biogeography rio grande do sulbotany

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