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| Gasper,André Luís de; Sevegnani,Lucia; Vibrans,Alexander Christian; Uhlmann,Alexandre; Lingner,Débora Vanessa; Verdi,Marcio; Dreveck,Susana; Stival-Santos,Anita; Brogni,Eduardo; Schmitt,Ronnie; Klemz,Guilherme. |
| A intensa exploração comercial de Dicksonia sellowiana a deixaram na categoria de ameaçada de extinção, sendo incluída na lista brasileira de espécies da flora ameaçada de extinção. Por isso, o presente trabalho visa apresentar o estudo da distribuição das populações de D. sellowiana para apontar os locais de maior ocorrência da espécie em Santa Catarina, e avaliar a relação da densidade populacional com fatores ambientais, como altitude e clima. Foram instaladas 225 unidades amostrais, com 4.000 m² nas regiões do planalto e oeste catarinense, baseadas na grade de 10 km x 10 km conforme procedimento do Inventário Florístico Florestal de Santa Catarina. Nestas 225 unidades amostrais, D. sellowiana foi encontrada em 94, com variação de um a 391 indivíduos. A... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Floresta Ombrófila Mista; Dicksoniaceae; Xaxim-bugio; Distribuição geográfica; Estrutura populacional; Ameaça de extinção. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000400005 |
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| Scipioni,Marcelo Callegari; Dobner Jr.,Mário; Longhi,Solon Jonas; Vibrans,Alexander Christian; Schneider,Paulo Renato. |
| ABSTRACT: Araucaria angustifolia (Bertol.) Kuntze is a native tree species of major importance in southern Brazil. It is a regional symbol due to its iconic shape and stature in the landscape; its wood was once economically important and its seeds are an important source of food for the fauna and are presently used in regional cuisine. Despite its importance and apparent abundance, the species is facing extinction mainly as a result of unregulated exploitation and deforestation. This study catalogued the remaining individuals in order to add to the body of knowledge available on A. angustifolia, a species that has become rare across its historic range. The circumference at breast height (1.30 m), the total height, and the tree volume were measured (3,529... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Giant tree; Large old tree; Monumental trees; Cavities trees; Araucaria forest. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001300220 |
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| Rezende,Vanessa Leite; Eisenlohr,Pedro V.; Gasper,André Luís de; Vibrans,Alexander Christian; Oliveira-Filho,Ary Teixeira de. |
| Accurate knowledge of floristic composition is crucial when planning and designing research projects and public policies. In this study, our goal was to assess tree sampling accuracy and to identify sites with higher concentrations of rare tree species, as well as those with the highest tree species richness, in the state of Santa Catarina, Brazil. We determined sampling accuracy using the first-order jackknife and Chao 2 estimators, calculated the number of rare species (singletons and doubletons) and applied sampled-based rarefaction. We found that sample accuracy (estimated vs. observed values) was over 90% for the state as a whole, the best estimates having been obtained for the areas of rain forest (first-order jackknife: 91%; Chao 2: 95%). Of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chao 2; Rainforest; First-order jackknife; Rare species; Semideciduous forest. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300011 |
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