首页|On the rocks:Biogeography and floristic identity of rocky ecosystems in eastern South America

On the rocks:Biogeography and floristic identity of rocky ecosystems in eastern South America

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The geodiversity of rocky ecosystems includes diverse plant communities with specific names,but their continental-scale floristic identity and the knowledge on the role of macroclimate remain patchy.Here,we assessed the identity of plant communities in eastern Brazil across multiple types of rocky landscapes and evaluated the relative importance of climatic variables in constraining floristic differentiation.We provided lists of diagnostic species and an assessment of the conservation status of the identified floristic groups.We compiled a data set of 151 sites(4498 species)from rocky ecosystems,including campos rupestres,campos de altitude,granitic-gneiss lowland inselbergs,and limestone outcrops.We used unsupervised clustering analysis followed by ANOSIM to assess floristic groups among sites.We performed a random forest variable selection to test whether the identified floristic groups occupy distinct climatic spaces.Six groups(lithobiomes)segregated floristically according to lithology and climate.Alongside campos de altitude and limestone outcrops,inselbergs were divided according to the biome in which they occur(Atlantic Forest or Caatinga),and campos rupestres were largely segregated according to their lithological matrix(ironstone or quartzitic).Plant communities of Caatinga inselbergs were more similar to limestone outcrops,while Atlantic Forest inselbergs communities resembled campos de altitude.The composition of plant communities on outcrops seems to be largely constrained by lithology,but climatic factors are also meaningful for sites with similar lithology.The current network of protected areas does not cover these unique ecosystems and their floristic heterogeneity,with Caatinga inselbergs and limestone outcrops being the least protected.

campos de altitudecampos rupestresgeodiversityinselbergironstonekarstlimestone outcropslithophytesrupicolous plant communities

Luísa Azevedo、Daniela Cristina Zappi、Daniela Melo Garcia de Oliveira、Leila Meyer、Eimear Nic Lughadha、Rosie Clegg、Leonardo Dias Meireles、Pablo Hendrigo Alves de Melo、R.Toby Pennington、Danilo M.Neves

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Programa de Pós-Graduação em Ecologia,Conservação e Manejo da Vida Silvestre,Instituto de Ciências Biológicas,Universidade Federal de Minas Gerais,Belo Horizonte 31270-901,Brazil

Programa de Pós-Graduação em Botânica,Instituto de Ciências Biológicas,Universidade de Brasilia,Brasília 70910-900,Brazil

Programa de Pós-graduação em Biologia Vegetal,Instituto de Ciências Biológicas,Universidade Federal de Minas Gerais,Belo Horizonte 31270-901,Brazil

The Herbarium,Royal Botanic Gardens,Kew,Richmond,Surrey TW9 3AE,UK

Geography,University of Exeter,Laver Building,North Park Road,Exeter EX4 4QE,UK

Gestão Ambiental,Escola de Artes,Ciências e Humanidades,Universidade de São Paulo,São Paulo 03828-000,Brazil

Centro Nacional de Conservação da Flora,Instituto de Pesquisas Jardim Botânico do Rio de Janeiro,Rio de Janeiro 22460-030,Brazil

Royal Botanic Garden Edinburgh,2oa Inverleith Row,Edinburgh EH3 5LR,UK

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Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq/BrazilInstituto Serrapilheira/BrazilCoordena??o de Aperfei?oamento de Pessoal de Nível Superior—CAPES/Prlnt/BrazilConselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq/Brazil巴西国家科学技术发展委员会项目

200430/2022-0Serra-1912-3208288887.474387/2020-00311035/2021-3304178/2021-7

2024

10.1111/jse.13052

植物分类学报
中国科学院植物研究所　中国植物学会

植物分类学报

CSTPCD
影响因子：0.322
ISSN：1674-4918
年,卷(期)：2024.62(2)
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