Titre:	Fire occurrence mediates small-mammal seed removal of native tree species in a neotropical savanna
Auteur(s):	Cazetta, Thayse Cavicchioli Vieira, Emerson Monteiro
metadata.dc.contributor.affiliation:	Universidade de Brasília, Instituto de Ciências Biológicas, Departamento de Ecologia, Laboratório de Ecologia de Vertebrados Universidade de Brasília, Instituto de Ciências Biológicas, Programa de Pós-graduação em Ecologia Universidade de Brasília, Instituto de Ciências Biológicas, Departamento de Ecologia, Laboratório de Ecologia de Vertebrados
Assunto::	Cerrados Mata de galeria Roedor Sementes - dispersão Fogo
Date de publication:	21-déc-2021
Editeur:	Frontiers
Référence bibliographique:	CAZETTA, Thayse Cavicchioli; VIEIRA, Emerson M. Fire occurrence mediates small-mammal seed removal of native tree species in a neotropical savanna. Frontiers in Ecology and Evolution, [S. l.], v. 9, art. 793947, 2021. DOI: https://doi.org/10.3389/fevo.2021.793947. Disponível em: https://www.frontiersin.org/journals/ecology-and-evolution/articles/10.3389/fevo.2021.793947/full. Acesso em:
Abstract:	Seed dispersal and predation are critical processes for plant recruitment which can be affected by fire events. We investigated community composition of small mammals in gallery forests with distinct burning histories (burned or not burned ∼3 years before) in the Cerrado (neotropical savanna). We evaluated the role of these animals as seed removers of six native tree species, potentially mediated by the occurrence of fire. We sampled four previously burned sites and four unburned ones. Seed removal was assessed using two exclusion treatments: exclusive access of small rodents and access of all seed-removing vertebrates. The previous burning changed the structural characteristics of the forests, increasing the density of the understory vegetation and herbaceous cover, which determined differences in species composition, richness, and abundance of small rodents (abundance in the burned forests was 1/6 of the abundance in the unburnt ones). Seed removal rates across the six species were reduced in burnt forests in both treatments and were higher for the “all vertebrates” treatment. Other vertebrates, larger than small rodents, played a significant role as seed removers for five of the six species. The effects of fire were consistent across species, but for the two species with the largest seeds (Hymenaea courbaril and Mauritia flexuosa) removal rates for both treatments were extremely low in the burned forests (≦5%). The observed decline in small rodent seed predation in the burned forests may have medium to long-term consequences on plant communities in gallery forests, potentially affecting community composition and species coexistence in these forests. Moreover, fire caused a sharp decline in seed removal by large mammals, indicating that the maintenance of dispersal services provided by these mammals (mainly the agouti Dasyprota azarae) for the large-seeded species may be jeopardized by the burning of gallery forests. This burning would also affect several small mammal species that occur in the surrounding typical savanna habitats but also use these forests. Fire events have been increasing in frequency and intensity because of human activities and climate changing. This current scenario poses a serious threat considering that these forests are fire-sensitive ecosystems within the Cerrado.
metadata.dc.description.unidade:	Instituto de Ciências Biológicas (IB) Departamento de Ecologia (IB ECL)
metadata.dc.description.ppg:	Programa de Pós-Graduação em Ecologia
Licença::	Copyright © 2021 Cazetta and Vieira. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
DOI:	https://doi.org/10.3389/fevo.2021.793947
Collection(s) :	Artigos publicados em periódicos e afins

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