Fire and legume germination in a tropical savanna: ecological and historical factors

[Background and Aims] In many flammable ecosystems, physically dormant seeds show dormancy-break patterns tied to fire, but the link between heat shock and germination in the tropical savannas of Africa and South America remains controversial. Seed heat tolerance is important, preventing seed mortal...

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Autores: Daibes, L. Felipe, Pausas, J. G., Bonani, Nathalia, Nunes, Jessika, Silveira, Fernando A. O., Fidelis, Alessandra
Tipo de documento: artigo
Estado:Versión aceptada para publicación
Data de publicação:2019
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/192167
Acesso em linha:http://hdl.handle.net/10261/192167
Access Level:Acceso aberto
Palavra-chave:Cerrado
Fabaceae (Leguminosae)
Fire ecology
Heat shock
Physical dormancy
Seed traits
Tropical savanna
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spelling Fire and legume germination in a tropical savanna: ecological and historical factorsDaibes, L. FelipePausas, J. G.Bonani, NathaliaNunes, JessikaSilveira, Fernando A. O.Fidelis, AlessandraCerradoFabaceae (Leguminosae)Fire ecologyHeat shockPhysical dormancySeed traitsTropical savanna[Background and Aims] In many flammable ecosystems, physically dormant seeds show dormancy-break patterns tied to fire, but the link between heat shock and germination in the tropical savannas of Africa and South America remains controversial. Seed heat tolerance is important, preventing seed mortality during fire passage, and is usually predicted by seed traits. This study investigated the role of fire frequency (ecological effects) and seed traits through phylogenetic comparison (historical effects), in determining post-fire germination and seed mortality in legume species of the Cerrado, a tropical savanna–forest mosaic. [Methods] Seeds of 46 legume species were collected from three vegetation types (grassy savannas, woody savannas and forests) with different fire frequencies. Heat shock experiments (100 °C for 1 min; 100 °C for 3 min; 200 °C for 1 min) were then performed, followed by germination and seed viability tests. Principal component analysis, generalized linear mixed models and phylogenetic comparisons were used in data analyses. [Key Results] Heat shocks had little effect on germination, but seed mortality was variable across treatments and species. Seed mortality was lowest under the 100 °C 1 min treatment, and significantly higher under 100 °C 3 min and 200 °C 1 min; larger seed mass decreased seed mortality, especially at 200 °C. Tree species in Detarioideae had the largest seeds and were unaffected by heat. Small-seeded species (mostly shrubs from grassy savannas) were relatively sensitive to the hottest treatment. Nevertheless, the presence of physical dormancy helped to avoid seed mortality in small-seeded species under the hottest treatment. [Conclusions] Physical dormancy-break is not tied to fire in the Cerrado mosaic. Heat tolerance appears in both forest and savanna species and is predicted by seed traits (seed mass and physical dormancy), which might have helped forest lineages to colonize the savannas. The results show seed fire responses are better explained by historical than ecological factors in the Cerrado, contrasting with different fire-prone ecosystems throughout the world.This study was partially financed by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) - Finance Code 001, and CAPES/PDSE Program (PDSE 88881.131702/2016-01). We also thank Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP 2015/06743-0), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq 455183/2014–7), and Fundação Grupo Boticário (0153_2011_PR) for financial support. A.F. received a grant from CNPq (306170/2015–9), N.B. and J.N. received grants from FAPESP (2017/00638-6 and 2015/11176-8), F.A.O.S. received grants from CNPq and FAPEMIG, and J.G.P. received funding from Generalitat Valenciana (PROMETEO/2016/021)Peer reviewedOxford University PressCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil)Fundação de Amparo à Pesquisa do Estado de São PauloConselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil)Fundação Grupo Boticário de Proteção à NaturezaGeneralitat ValencianaPausas, J. G. [0000-0003-3533-5786]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201920192019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/192167reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1093/aob/mcz028Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1921672026-05-22T06:33:51Z
dc.title.none.fl_str_mv Fire and legume germination in a tropical savanna: ecological and historical factors
title Fire and legume germination in a tropical savanna: ecological and historical factors
spellingShingle Fire and legume germination in a tropical savanna: ecological and historical factors
Daibes, L. Felipe
Cerrado
Fabaceae (Leguminosae)
Fire ecology
Heat shock
Physical dormancy
Seed traits
Tropical savanna
title_short Fire and legume germination in a tropical savanna: ecological and historical factors
title_full Fire and legume germination in a tropical savanna: ecological and historical factors
title_fullStr Fire and legume germination in a tropical savanna: ecological and historical factors
title_full_unstemmed Fire and legume germination in a tropical savanna: ecological and historical factors
title_sort Fire and legume germination in a tropical savanna: ecological and historical factors
dc.creator.none.fl_str_mv Daibes, L. Felipe
Pausas, J. G.
Bonani, Nathalia
Nunes, Jessika
Silveira, Fernando A. O.
Fidelis, Alessandra
author Daibes, L. Felipe
author_facet Daibes, L. Felipe
Pausas, J. G.
Bonani, Nathalia
Nunes, Jessika
Silveira, Fernando A. O.
Fidelis, Alessandra
author_role author
author2 Pausas, J. G.
Bonani, Nathalia
Nunes, Jessika
Silveira, Fernando A. O.
Fidelis, Alessandra
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil)
Fundação de Amparo à Pesquisa do Estado de São Paulo
Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil)
Fundação Grupo Boticário de Proteção à Natureza
Generalitat Valenciana
Pausas, J. G. [0000-0003-3533-5786]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Cerrado
Fabaceae (Leguminosae)
Fire ecology
Heat shock
Physical dormancy
Seed traits
Tropical savanna
topic Cerrado
Fabaceae (Leguminosae)
Fire ecology
Heat shock
Physical dormancy
Seed traits
Tropical savanna
description [Background and Aims] In many flammable ecosystems, physically dormant seeds show dormancy-break patterns tied to fire, but the link between heat shock and germination in the tropical savannas of Africa and South America remains controversial. Seed heat tolerance is important, preventing seed mortality during fire passage, and is usually predicted by seed traits. This study investigated the role of fire frequency (ecological effects) and seed traits through phylogenetic comparison (historical effects), in determining post-fire germination and seed mortality in legume species of the Cerrado, a tropical savanna–forest mosaic. [Methods] Seeds of 46 legume species were collected from three vegetation types (grassy savannas, woody savannas and forests) with different fire frequencies. Heat shock experiments (100 °C for 1 min; 100 °C for 3 min; 200 °C for 1 min) were then performed, followed by germination and seed viability tests. Principal component analysis, generalized linear mixed models and phylogenetic comparisons were used in data analyses. [Key Results] Heat shocks had little effect on germination, but seed mortality was variable across treatments and species. Seed mortality was lowest under the 100 °C 1 min treatment, and significantly higher under 100 °C 3 min and 200 °C 1 min; larger seed mass decreased seed mortality, especially at 200 °C. Tree species in Detarioideae had the largest seeds and were unaffected by heat. Small-seeded species (mostly shrubs from grassy savannas) were relatively sensitive to the hottest treatment. Nevertheless, the presence of physical dormancy helped to avoid seed mortality in small-seeded species under the hottest treatment. [Conclusions] Physical dormancy-break is not tied to fire in the Cerrado mosaic. Heat tolerance appears in both forest and savanna species and is predicted by seed traits (seed mass and physical dormancy), which might have helped forest lineages to colonize the savannas. The results show seed fire responses are better explained by historical than ecological factors in the Cerrado, contrasting with different fire-prone ecosystems throughout the world.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/192167
url http://hdl.handle.net/10261/192167
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1093/aob/mcz028
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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