Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forest

Detalhes bibliográficos
Autor(a) principal: Gastauer,Markus
Data de Publicação: 2017
Outros Autores: Saporetti-Junior,Amílcar W., Valladares,Fernando, Meira-Neto,João A. A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Acta Botanica Brasilica
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400531
Resumo: ABSTRACT Mussununga, an oligotrophic sandy savanna ecosystem, comprises distinct physiognomies along fire, water and nutrient availability gradients. Grasslands and woodlands are constrained at the opposite poles of these gradients, with grasslands occurring in areas with poorer soils and higher levels of both water-stress and fire intensity. According to the stress-dominance hypothesis, one might expect the importance of competition for community assembly to increase from grasslands to woodlands. Assuming conservation of ecological niches within evolutionary lineages, this should increase phylogenetic overdispersion from grasslands towards woodlands. To test this, we calculated phylogenetic diversity and community structure using different null models as well as the phylogenetic signal of life form as a proxy of niche space. All indices indicate phylogenetic clustering for grasslands and phylogenetic overdispersion for woodlands. Considering that most life-forms showed a significant phylogenetic signal, findings indicate that competition and further density dependent factors may play a larger role in community assembly of physiognomies in less harsh positions along the gradient, while environmental filtering dominates the harsher positions. Our results indicate that the entire gradient should receive conservation priority in order to guarantee the effective conservation of this endangered ecosystem, including its species richness and ecological processes such as community assembly.
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spelling Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forestcompetitionenvironmental filtersMussunungassavanna woodlandsstress-dominance hypothesisABSTRACT Mussununga, an oligotrophic sandy savanna ecosystem, comprises distinct physiognomies along fire, water and nutrient availability gradients. Grasslands and woodlands are constrained at the opposite poles of these gradients, with grasslands occurring in areas with poorer soils and higher levels of both water-stress and fire intensity. According to the stress-dominance hypothesis, one might expect the importance of competition for community assembly to increase from grasslands to woodlands. Assuming conservation of ecological niches within evolutionary lineages, this should increase phylogenetic overdispersion from grasslands towards woodlands. To test this, we calculated phylogenetic diversity and community structure using different null models as well as the phylogenetic signal of life form as a proxy of niche space. All indices indicate phylogenetic clustering for grasslands and phylogenetic overdispersion for woodlands. Considering that most life-forms showed a significant phylogenetic signal, findings indicate that competition and further density dependent factors may play a larger role in community assembly of physiognomies in less harsh positions along the gradient, while environmental filtering dominates the harsher positions. Our results indicate that the entire gradient should receive conservation priority in order to guarantee the effective conservation of this endangered ecosystem, including its species richness and ecological processes such as community assembly.Sociedade Botânica do Brasil2017-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400531Acta Botanica Brasilica v.31 n.4 2017reponame:Acta Botanica Brasilicainstname:Sociedade Botânica do Brasil (SBB)instacron:SBB10.1590/0102-33062016abb0442info:eu-repo/semantics/openAccessGastauer,MarkusSaporetti-Junior,Amílcar W.Valladares,FernandoMeira-Neto,João A. A.eng2017-10-11T00:00:00Zoai:scielo:S0102-33062017000400531Revistahttps://www.scielo.br/j/abb/ONGhttps://old.scielo.br/oai/scielo-oai.phpacta@botanica.org.br||acta@botanica.org.br|| f.a.r.santos@gmail.com1677-941X0102-3306opendoar:2017-10-11T00:00Acta Botanica Brasilica - Sociedade Botânica do Brasil (SBB)false
dc.title.none.fl_str_mv Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forest
title Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forest
spellingShingle Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forest
Gastauer,Markus
competition
environmental filters
Mussunungas
savanna woodlands
stress-dominance hypothesis
title_short Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forest
title_full Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forest
title_fullStr Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forest
title_full_unstemmed Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forest
title_sort Phylogenetic community structure reveals differences in plant community assembly of an oligotrophic white-sand ecosystem from the Brazilian Atlantic Forest
author Gastauer,Markus
author_facet Gastauer,Markus
Saporetti-Junior,Amílcar W.
Valladares,Fernando
Meira-Neto,João A. A.
author_role author
author2 Saporetti-Junior,Amílcar W.
Valladares,Fernando
Meira-Neto,João A. A.
author2_role author
author
author
dc.contributor.author.fl_str_mv Gastauer,Markus
Saporetti-Junior,Amílcar W.
Valladares,Fernando
Meira-Neto,João A. A.
dc.subject.por.fl_str_mv competition
environmental filters
Mussunungas
savanna woodlands
stress-dominance hypothesis
topic competition
environmental filters
Mussunungas
savanna woodlands
stress-dominance hypothesis
description ABSTRACT Mussununga, an oligotrophic sandy savanna ecosystem, comprises distinct physiognomies along fire, water and nutrient availability gradients. Grasslands and woodlands are constrained at the opposite poles of these gradients, with grasslands occurring in areas with poorer soils and higher levels of both water-stress and fire intensity. According to the stress-dominance hypothesis, one might expect the importance of competition for community assembly to increase from grasslands to woodlands. Assuming conservation of ecological niches within evolutionary lineages, this should increase phylogenetic overdispersion from grasslands towards woodlands. To test this, we calculated phylogenetic diversity and community structure using different null models as well as the phylogenetic signal of life form as a proxy of niche space. All indices indicate phylogenetic clustering for grasslands and phylogenetic overdispersion for woodlands. Considering that most life-forms showed a significant phylogenetic signal, findings indicate that competition and further density dependent factors may play a larger role in community assembly of physiognomies in less harsh positions along the gradient, while environmental filtering dominates the harsher positions. Our results indicate that the entire gradient should receive conservation priority in order to guarantee the effective conservation of this endangered ecosystem, including its species richness and ecological processes such as community assembly.
publishDate 2017
dc.date.none.fl_str_mv 2017-12-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400531
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/0102-33062016abb0442
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dc.publisher.none.fl_str_mv Sociedade Botânica do Brasil
publisher.none.fl_str_mv Sociedade Botânica do Brasil
dc.source.none.fl_str_mv Acta Botanica Brasilica v.31 n.4 2017
reponame:Acta Botanica Brasilica
instname:Sociedade Botânica do Brasil (SBB)
instacron:SBB
instname_str Sociedade Botânica do Brasil (SBB)
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collection Acta Botanica Brasilica
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