Fine-scale spatial genetic structure of Dalbergia nigra (Fabaceae), a threatened and endemic tree of the Brazilian Atlantic Forest

Genetics and Molecular Biology

Renata Santiago De Oliveira Buzatti²  Renata Acácio Ribeiro¹  José Pires De Lemos Filho¹  Maria Bernadete Lovato² 

[1] ,Universidade Federal de Minas Gerais Instituto de Ciências Biológicas Departamento de Biologia GeralBelo Horizonte MG ,Brazil

关键词: Dalbergia nigra;    Atlantic Forest;    conservation genetics;    fine-scale spatial genetic structure;    Sp statistic;   

DOI  :  10.1590/S1415-47572012005000066

来源: SciELO

【 摘 要 】

The Atlantic Forest is one of the most diverse ecosystems in the world and considered a hotspot of biodiversity conservation. Dalbergia nigra (Fabaceae) is a tree endemic to the Brazilian Atlantic Forest, and has become threatened due to overexploitation of its valuable timber. In the present study, we analyzed the genetic diversity and fine-scale spatial genetic structure of D. nigra in an area of primary forest of a large reserve. All adult individuals (N = 112) were sampled in a 9.3 ha plot, and genotyped for microsatellite loci. Our results indicated high diversity with a mean of 8.6 alleles per locus, and expected heterozygosity equal to 0.74. The co-ancestry coefficients were significant for distances among trees up to 80 m. The Sp value was equal to 0.017 and indirect estimates of gene dispersal distances ranged from 89 to 144 m. No strong evidence of bottleneck or effects of human-disturbance was found. This study highlights that long-term efforts to protect a large area of Atlantic Forest have been effective towards maintaining the genetic diversity of D. nigra. The results of this study are important towards providing a guide for seed collection for ex-situ conservation and reforestation programmes of this threatened species.

【 授权许可】

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