Espécies Arbóreas De Um Trecho De Floresta Atlântica Do Município De Antonina, Paraná, Brasil

Abstract

Com o objetivo de subsidiar futuros estudos de dinâmica da vegetação e efeitos das mudanças climáticas, realizou-se um levantamento florístico do componente arbóreo em área de Floresta Ombrófila Densa da Reserva Natural do Rio Cachoeira, em Antonina, Paraná. O levantamento foi realizado em 187 parcelas permanentes, que representam 23,5 ha amostrados. Foram identificadas 306 espécies distribuídas em 68 famílias. A zoocoria foi a síndrome de dispersão mais comum (81,7% das espécies). Espécies tolerantes à sombra superaram discretamente as não tolerantes (50,3% e 49,7%, respectivamente). Espécies de distribuição geográfica ampla representaram quase metade do total (48,4%). Desse conjunto florístico, 21 espécies encontram-se sob alguma categoria de risco de extinção, o que representa 6,9% do universo encontrado, valor maior que o verificado na maioria dos estudos conduzidos nessa mesma formação (em torno de 2%). Essa situação reflete os efeitos da pressão contínua a que a floresta está sujeita, onde a superexplotação de essências nativas ao longo dos anos, associada à deterioração da floresta por meio da fragmentação e da perda de hábitats, resulta em maior risco à conservação de espécies do bioma.Palavras-chave: Floresta Ombrófila Densa; florística; espécies ameaçadas; síndromes de dispersão. AbstractTree species from an Atlantic Forest remnant in Antonina, Paraná, Southern Brazil. Aiming to support new vegetation dynamics and climate change studies, a floristic survey of the tree species was conducted in the Atlantic Forest at Rio Cachoeira Natural Reserve, in Antonina municipality, Southern Brazil. The survey was intensified in 187 permanent plots, representing 23.5 ha of sampled area. The floristic collection was represented by 306 tree species, distributed in 68 families. Zoochory was the most common dispersion syndrome (81.7%). According to the shadow tolerance, 50.3% of the species were tolerant, while non-tolerant species were 49.7%. Wide geographical distribution species represented almost half of all this floristic set (48.4%).Threatened species were 6.9% of all species found (21), a higher value than that one reported to other studies on this forest type (around 2%). This situation shows the effects of continuous pressure on the forest, as the over exploitation of the vegetation through the years, associated to the forest damage by fragmentation and habitat loss process leads to the higher risks for species conservation on this biome.Keywords: Ombrophilous Dense Forest; floristic composition; threatened species; dispersion ways.

Stem growth rhythms in trees of a tropical rainforest in Southern Brazil

“…The reserves comprise primary and secondary forests distributed in lowland and montane areas, characterized by high species richness, including a total of 306 tree species (Liebsch et al 2008;Borgo et al 2011). In the lowland areas, the forest was logged over 30 years and converted into pasture areas for livestock.…”

“…Ten tree species naturally occurring in the lowland and slope successional areas (20-60 years old) of the Atlantic forest were selected based on their high frequency in the region (Liebsch et al 2007;Borgo et al 2011). We selected species representing different leaf phenology: six semideciduous, three deciduous and one evergreen (Table 1).…”

Natural Regeneration in Tropical Rainforest, Northeastern Brazil

“…1) zoochoric predominated with 83%. This greater representativeness of zoochory is common in surveys carried out in forests of the Brazilian coast as verified by Borgo et al [21], in a floristic survey of the arboreal component in an area of Ombrophylous Dense Forest, Paraná, which found 81.7%.…”

Comparison of the phytochemical profiles of five native plant species in two different forest formations

“…Species chosen for study needed to be: (a) native, (b) recommended for environmental restoration programs, and (c) occur in more than one forest formation (Carpanezzi and Carpanezzi, 2006;Borgo et al, 2011;Gris et al, 2012)…”