ABSTRACT A functional perspective of tree communities is helpful for understanding forest dynamics, especially vegetation recovery after other land uses. Knowledge about ecological filters and survival strategies of trees are also important for the restoration of degraded areas. This study aimed to evaluate the functional composition and structure of adult and regenerative components of natural Araucaria forests, Araucaria plantations and plantations of exotic Pinus in subtropical southern Brazil. Differences in functional diversity and functional richness, and in community weighted mean trait values, including leaf traits and reproductive traits, were analyzed. RLQ analysis was used to assess the association between community structure, plant traits and environmental variables. Clear differences were found for most traits and for functional richness for the regenerative component, while the adult component was more similar among forest types. A clear separation in RLQ ordination associated with trait variation, for the adult component but not for regenerative trees, also indicates that communities are becoming functionally more similar with time. Plantations were shown to function as environmental filters by directly influencing species recruitment, richness and functional diversity. We conclude that passive restoration may be the best strategy for restoration of Araucaria forests.

Uma das unidades federativas com melhor conhecimento de sua flora, Santa Catarina é o primeiro estado a concluir o Inventário Florístico Florestal na atualidade. Coberto por Floresta Ombrófila Densa, Floresta Ombrófila Mista, Floresta Estacional Decidual e formações associadas, possui grande riqueza de espécies. Este trabalho visa apresentar as espécies de pteridófitas coletadas nas 563 unidades amostrais visitadas. Ao todo 324 espécies foram registradas, das quais 300 são samambaias e 24, licófitas. Estas pertencem a 29 famílias e 94 gêneros, sendo as famílias com maior riqueza específica Polypodiaceae (48 espécies), Pteridaceae (42) e Dryopteridaceae (38). Os gêneros com maior diversidade de espécies foram Asplenium e Thelypteris, com 27 espécies, seguido por Blechnum com 15. Destacam-se ainda 75 espécies consideradas endêmicas para o bioma. 18 registros novos para a flora de Santa Catarina foram feitos. A distribuição por região fitoecológica é a que segue: 288 espécies para a Floresta Ombrófila Densa (128 exclusivas desta região fitoecológica), 177 para a Floresta Ombrófila Mista (30 exclusivas) e 57 para a Floresta Estacional Decidual (três exclusivas). Foram registradas ainda 17 espécies para a restinga. Destaca-se a importância do registro de Asplenium lacinulatum, espécie coletada em área de intensa exploração imobiliária e novo registro para Santa Catarina e Alansmia senilis primeiro registro para o Sul do Brasil.

Santa Catarina is the first Brazilian state to complete its Forest and Floristic Inventory, and is considered one of the states with a well-known flora. This region is covered by evergreen tropical rain forest, Araucaria forest, seasonal deciduous forest and associated ecosystems, and shows high species richness. This paper presents a list of ferns collected in 563 sampling units. Altogether, 324 species were recorded (300 ferns and 24 lycophytes), which belong to 29 families and 94 genera. The most diverse families are Polypodiaceae (49 species), Pteridaceae (42), and Dryopteridaceae (38). Asplenium and Thelypteris are the most diverse genera, with 27 species each, followed by Blechnum (15). Of importance, too, are the 75 species considered endemic to the biome. Eighteen new records for the flora of Santa Catarina were made. The distribution of species according to the vegetation type is the following: 288 species occur in evergreen tropical rainforest (of which 128 are exclusive to this vegetation type); 177 species in Araucaria forest (30 exclusively) and 57 species in seasonal deciduous forest (3 exclusively). In addition, 17 species were recorded for restinga. A collection of Asplenium lacinulatum, from an area of intense development, is first record for Santa Catarina, and another of Alansmia senilis is the first record for the South Region of Brazil.