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Aspectos ecológicos de Alsophila setosa Kaulf. (Cyatheaceae, Pteridophyta) no Rio Grande do Sul, Brasil Translated title: Ecological aspects of Alsophila setosa Kaulf. (Cyatheaceae, Pteridophyta) in Rio Grande do Sul State, Brazil

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      Abstract

      Alsophila setosa Kaulf. é uma pteridófita arborescente que ocorre em formações florestais primárias e secundárias no sul e sudeste do Brasil. O presente estudo discute a estrutura populacional de A. setosa, a arquitetura das partes subterrâneas, bem como herbivoria em suas frondes e espécies epifíticas. O trabalho de campo foi desenvolvido em duas formações vegetais secundárias, nos municípios de Morro Reuter e de Sapiranga, no Estado do Rio Grande do Sul, Brasil. Parcelas contíguas de 100 m² foram amostradas para registro da ocorrência de A. setosa e da altura das plantas. Foram marcadas 45 plantas, em Morro Reuter, e 48 plantas, em Sapiranga, para verificar durante um ano, a ação de herbívoros em suas frondes. Cinco plantas foram desenterradas para o estudo de suas partes subterrâneas. As plantas epifíticas presentes sobre os cáudices foram registradas e amostradas. A estrutura subterrânea é complexa, com ramos caulinares que podem formar novas plantas, contribuindo para o aumento do número de indivíduos e para a distribuição espacial agregada, no local. Um grande número de plantas de menor altura foi registrado. Foram observados danos por herbivoria em 28,88% das plantas de Morro Reuter e 35,41% das plantas de Sapiranga. Foram encontradas 16 espécies de epífitos vasculares, com predominância de holoepífitos . Os forófitos são de especial importância para a conservação de algumas espécies epifíticas.

      Translated abstract

      Alsophila setosa Kaulf. is a tree fern occurring in the primary and secondary forest formations in South and Southeastern Brazil. The present study discusses population structure, architecture of the underground parts as well as herbivory of fronds and epiphytic species. Fieldwork was performed in two secondary forest tracts in the municipalities of Morro Reuter and Sapiranga in the state of Rio Grande do Sul, Brazil. Contiguous 100 m² plots were surveyed as to the occurrence of A. setosa and plants sizes. Two samples, of 45 plants in Morro Reuter and 48 in Sapiranga, were examined throughout a full year cycle as to herbivory on their fronds. Five plants were uprooted for the study of the underground structures. The epiphytic plants on the caudexes were recorded and sampled. The underground structure is complex, with caulinar branches that may form new plants, leading to an increase of the number of individuals in a stand and to an aggregate spatial distribution. A larger number of smaller plants was recorded. Herbivory damage was observed on 28.88% of the plants in Morro Reuter and 35.41% in Sapiranga. As to vascular epiphytes, 16 species were found, with a predominance of holoepiphytes. This role as phorophyte is of special importance for the conservation of some the epiphytic species.

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      Most cited references 37

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            Author and article information

            Affiliations
            [1 ] Universidade Feevale Brazil
            [2 ] Universidade do Vale do Rio dos Sinos Brazil
            Contributors
            Role: ND
            Role: ND
            Journal
            abb
            Acta Botanica Brasilica
            Acta Bot. Bras.
            Sociedade Botânica do Brasil (Belo Horizonte )
            1677-941X
            December 2005
            : 19
            : 4
            : 859-865
            S0102-33062005000400021
            10.1590/S0102-33062005000400021

            http://creativecommons.org/licenses/by/4.0/

            Product
            Product Information: SciELO Brazil
            Categories
            PLANT SCIENCES

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