composition, community structure and vertical distribution of epiphytic ferns on alsophila setosa kaulf., in a semideciduous seasonal forest, morro reuter, rs, brazil composição, estrutura comunitária e distribuição vertical de samambaias epifíticas sobre alsophila setosa kaulf. (cyatheaceae), em floresta estacional semidecidual, morro reuter, rs, brasil

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ID: 247055
2011
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Abstract
In tropical forests, tree ferns constitute an important phorophyte for the establishment and occurrence of epiphytic species. Composition, structure and vertical distribution of epiphytic ferns were studied on Alsophila setosa Kaulf., in a semideciduous seasonal forest fragment, in the city of Morro Reuter (29º32'07"S and 51º05'26"W), in the state of Rio Grande do Sul, Brazil. The sample consisted of 60 caudices of at least 4 m high, which were divided in 1 m intervals from the ground. The specific importance value was estimated trough the coverage value and caudex frequency at the intervals. A total of 14 species was recorded, belonging to 10 genera and five families. The highest specific richness occurred in Polypodiaceae. The rarefaction curve for the total sample did not reach an asymptote with an estimated 14.98 to 16.95 species, showing that a few species could still be recorded. The species with the highest importance value and vertical amplitude was Blechnum binervatum (Poir.) C.V. Morton & Lellinger, with a decreasing frequency from bottom to top of the caudex. Considering the predominance of habitual holoepiphytes, the removal of Alsophila setosa caudices compromises microhabitat availability for epiphytes in the forest understory.
Nas florestas tropicais as samambaias arborescentes constituem forófitos importantes para o estabelecimento e ocorrência de espécies epifíticas. A composição, a estrutura e a distribuição vertical de samambaias epifíticas foram estudadas sobre Alsophila setosa Kaulf., em fragmento de Floresta Estacional Semidecidual, localizado no município de Morro Reuter (29º32'07"S e 51º05'26"W), Rio Grande do Sul, Brasil. Foram amostrados 60 cáudices de no mínimo 4 m de altura e eles foram divididos em intervalos de 1 m, a partir do solo. O valor de importância específico foi estimado a partir da freqüência nos cáudices , nos intervalos e do valor de cobertura. Foram registradas 14 espécies epifíticas, representando 10 gêneros e cinco famílias. A maior riqueza específica ocorreu em Polypodiaceae. A curva de rarefação para a amostra total não assumiu uma assíntota, sendo que foram estimadas entre 14,98 e 16,95 espécies, apontando que poucas espécies ainda poderiam ser amostradas nessa área. A espécie com maior valor de importância e amplitude vertical foi Blechnum binervatum (Poir.) C.V. Morton & Lellinger, com freqüência decrescente no sentido base-ápice do cáudice. Considerando o predomínio de holoepífitos habituais, a remoção de cáudices de Alsophila setosa compromete a disponibilidade de microhabitats para epífitos no sub bosque florestal.
Reference Key
schneider2011actacomposition, Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Paulo Henrique Schneider;Jairo Lizandro Schmitt
Journal monatshefte für chemie chemical monthly
Year 2011
DOI
10.1590/S0102-33062011000300007
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