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Genetic diversity and structure of Drimys brasiliensis in southern Brazil: insights for conservation

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Abstract

Population genetics studies are widely recognized for generating useful knowledge for biodiversity conservation. To date, however, little is known about the levels and distribution of genetic diversity of Drymis brasiliensis (Miers LC), a tree species from the Atlantic Rainforest. Therefore, in this study, we investigated how genetic diversity is distributed within and among populations of D. brasiliensis from southern Brazil using allozyme markers to genotype reproductive trees (8 populations) and seedlings (3 populations). Furthermore, in two populations, we established two permanent plots (5.1 and 1 ha) to analyze fine-scale genetic structure (FSGS). Studied populations presented low levels of genetic diversity (reproductive = 0.085; seedlings = 0.054) and high fixation indexes (reproductive = 0.396; seedlings = 0.231). Genetic divergence among populations was equal to 0.05, which is significant, signaling that few populations can conserve large portions of the species total genetic diversity. FSGS was only detected for one population, when reproductive individuals were separated by less than 40 m. Low genetic diversity combined with high fixation indexes clearly signal a risk of losing diversity. Therefore, conservation efforts should be aimed at enhancing gene flow within the studied populations.

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Acknowledgements

We kindly thank the farmers Josué Dalasanta and Alcebíades Sagiorato for allowing us to conduct research on their properties. We thank the Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio) and the researchers of Núcleo de Pesquisas em Florestas Tropicais for fieldwork support. We also thank the Laboratório de Fisiologia do Desenvolvimento e Genética Vegetal for providing the necessary infrastructure for the genetic analyses and David Martin for editing the manuscript.

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  1. Núcleo de Pesquisas Em Florestas Tropicais, Pós-Graduação Em Recursos Genéticos Vegetais, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina, Rodovia Admar Gonzaga, 1346, Florianópolis, SC, 88034-000, Brazil

    Alexandre Mariot, Tiago Montagna & Maurício Sedrez dos Reis

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  1. Alexandre Mariot
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  2. Tiago Montagna
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  3. Maurício Sedrez dos Reis
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Correspondence to Tiago Montagna.

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Project funding: The work was supported by the Fundo Rotativo de Estímulo à Pesquisa Agropecuária do Estado de Santa Catarina (FEPA), Aperfeiçoamento de Pessoal de Nível Superior (CAPES) to TM, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq:, the Coordenação de, and the) to MSR (304724/2010-6).

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Corresponding editor: Tao Xu.

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Mariot, A., Montagna, T. & Reis, M.S. Genetic diversity and structure of Drimys brasiliensis in southern Brazil: insights for conservation. J. For. Res. 31, 1325–1332 (2020). https://doi.org/10.1007/s11676-019-00934-9

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