AZEVEDO, V. C. R.

BOSHIER, D. H.

HARRIS, S. A.

KANASHIRO, M.

MAUES, M. M.

VINSON, C.

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ATBC 2012 49th Annual Meeting Bonito-MS, Brasil     S36.OC.05   The effect of selective logging on genetic diversity of two Amazonian species with contrasting  ecological and  reproductive characteristics  Christina Vinson1, Kanashiro M2, Azevedo VCR3, Maues MM2, Harris SA4, Boshier DH4 - 1Universidade Federal de Viçosa - Instituto de Biotecnologia Aplicada à Agropecuária, 2Embrapa Amazônia Oriental, 3Embrapa Recursos Genéticos e Biotecnologia, 4University of Oxford - Plant Sciences Department  An important component of the Dendrogene project was the study of genetic structure, gene flow and reproductive biology of Amazonian timber species, before and after logging.  Genetic data together with growth, regeneration and ecological data of the species are integrated in a simulation model analysis (Eco-gene), with different scenarios and intensities of logging, in order to evaluate outputs for supporting policies and and management practices to seek  sustainable forest management and genetic resources conservation. This  presentation  focus on two Amazonian timber species [Dipteryx odorata (Leguminosae) tetraploid, and  Jacaranda copaia (Bignoniaceae), diploid]. Genetic diversity and gene flow were characterized using hypervariable microsatellite markers before and after logging.  Long-term genetic and demographic impacts (300 hundred years) were evaluated through simulations using the Eco-gene model. Overall, there were no short or long term impacts on this population of J. copaia, where current Brazilian forest management regulations are sustainable for both timber extraction and genetic diversity of the species. In contrast,  D. odorata showed both short and long-term genetic and demographic impacts from selective logging. The removal of trees caused a 10% allele loss. Asynchrony of flowering could also limit the reproduction of D. odorata if the logged forest is fragmented with no connectivity between remnant forest patches. In the long term D. odorata will not cope with current Brazilian forest management practice. Increasing the minimum cutting diameter from 50 cm to 100 cm of dbh over a 30-year logging cycle, seems to be a  recommended scenario for D. odorata. This work  supports the idea that ecological and genetic information at species, ecological guild or reproductive group levels are essential in helping to derive sustainable management scenarios for tropical forests. Financial Support: Embrapa Amazônia Oriental/ABC/DFID e FINEP/MCT/CNPq, Clarendon Program (University of Oxford), Beca Program-IEB/Fundação Moore e Program Alβan. 983

The effect of selective logging on genetic diversity of two Amazonian species with contrasting ecological and reproductive characteristics.

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