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Herb–subshrub diversity in open savanna sites with distinct fire regimes in the Jalapão region, Brazil

Published online by Cambridge University Press:  23 May 2022

Guilherme Medeiros Antar Open the ORCID record for Guilherme Medeiros Antar [Opens in a new window] ,
Vânia Regina Pivello ,
Caian Souza Gerolamo ,
Anselmo Nogueira  and
Paulo Takeo Sano
Guilherme Medeiros Antar*
Affiliation:
Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, Rua do Matão 277, São Paulo, SP, 05508-090, Brazil Instituto Tecnológico Vale, Rua Boaventura da Silva 955, Belém, PA66055-090, Brazil
Vânia Regina Pivello
Affiliation:
Departamento de Ecologia, Instituto de Biociências, Universidade de São Paulo, Rua do Matão, Travessa 14, São Paulo, SP05508-090, Brazil
Caian Souza Gerolamo
Affiliation:
Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, Rua do Matão 277, São Paulo, SP, 05508-090, Brazil
Anselmo Nogueira
Affiliation:
Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Alameda da Universidade, São Bernardo do Campo, SP, 09606-045, Brazil
Paulo Takeo Sano
Affiliation:
Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, Rua do Matão 277, São Paulo, SP, 05508-090, Brazil
*
Author for correspondence: Guilherme Medeiros Antar, Email: guilherme.antar@gmail.com
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Abstract

The fire regime is essential in creating a mosaic of plant structure and diversity in South American open savannas, especially favouring herbs. However, studies investigating diversity patterns in Neotropical savannas rarely focus on the herb–subshrub layer. This study investigated the variation of the herb–subshrub layer under contrasting fire regimes in the most conserved site within the Cerrado Domain, the Jalapão region, Brazil. We selected four sites of open savanna physiognomy with similar topographic, climatic and edaphic features: three burned every 2 years, while the fourth site has remained unburned for at least the last 10 years. We randomly distributed 15 plots of 4 m2 in each site and identified all herbs and subshrubs in each plot to estimate density, richness, alpha diversity and species composition. The unburned site had lower herb–subshrub density, richness and diversity than the frequently burned sites. Species composition varied between frequently burned and unburned sites, partially explained by the fire frequency across sites. Although other ecological factors may explain the patterns detected, we cannot rule out the importance of fire in structuring plant communities in the Jalapão region. As in other savannas, our study in the Cerrado Domain reinforces the essential role of the fire regimes in modifying and maintaining the diversity of herbaceous plants at the landscape scale.

Keywords

campo sujofire managementNeotropical savannaplant distributionvegetation structure
Type
Research Article
Information
Journal of Tropical Ecology , Volume 38 , Issue 6 , November 2022 , pp. 331 - 339
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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