5 Works

Facilitation by isolated trees triggers woody encroachment and a biome shift at the savanna-forest transition

Rodolfo Abreu, Giselda Durigan, Antônio Carlos Melo, Natashi Pilon & William Hoffmann
1. Woody encroachment into grassy biomes is a global phenomenon, often resulting in a nearly complete turnover of species, with savanna specialists being replaced by forest-adapted species. Understanding the mechanisms involved in this change is important for devising strategies for managing savannas. 2. We examined how isolated trees favor woody encroachment and species turnover by overcoming dispersal limitation and environmental filtering. In a savanna released from fire in southeastern Brazil (Cerrado) we sampled woody plants...

Educação de jovens e adultos em diferentes tempos e espaços de vida

Luís Alcoforado, Márcia Regina Barbosa & Adriana Alves Fernandes Costa

Interviews from field research in Rio de Janeiro State - Brazil

Nádia Aun & Renato Linhares De Assis
This paper presents a case study on organic agriculture at Região Serrana Fluminense, Rio de Janeiro State, Brazil. We sought to understand what was the role of organic farming, and if it can be considered as an aggregating element between different kind of people or groups who were located in the same region. The methodology used to carry out this investigation was based on the concept of the Rural Network, which enabled us to comprehend...

Trophic rewilding benefits a tropical community through direct and indirect network effects

Pedro Uchoa Mittelman, Anna Rebello Landim, Luísa Genes, Ana Paula A. Assis, Carolina Starling-Manne, Paula V. Leonardo, Fernando A.S. Fernandez, & Alexandra Pires
Species reintroductions can be used as a conservation strategy to restore ecological interactions and the functionality of impoverished ecosystems. The ecological effects of reintroductions go beyond restoring pairwise interactions, because reintroductions can change how extant species are indirectly linked to each other in an ecological community. These indirect pathways, in turn, may shape a myriad of ecological and evolutionary processes operating in ecological systems. Here, we investigated how reintroductions may affect the direct and indirect...

Savannas are not old fields: functional trajectories of forest expansion in a fire-suppressed Brazilian savanna are driven by habitat generalists

Samuel Flake, Rodolfo Abreu, Giselda Durigan & William Hoffmann
Under fire suppression, many tropical savannas transform into forests. Forest expansion entails changes in environmental variables and plant community structure. We hypothesized that forest expansion into savanna results in a shift in community-weighted mean functional traits from stress tolerance to competitiveness, with generalist species having trait values intermediate between those of specialists of savanna and forest habitats. We studied 30 plots distributed over three savanna-forest boundaries undergoing forest expansion in the Brazilian Cerrado, capturing a...

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