Document Detail


Wood identification of Dalbergia nigra (CITES Appendix I) using quantitative wood anatomy, principal components analysis and naive Bayes classification.
MedLine Citation:
PMID:  19884155     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND AND AIMS: Dalbergia nigra is one of the most valuable timber species of its genus, having been traded for over 300 years. Due to over-exploitation it is facing extinction and trade has been banned under CITES Appendix I since 1992. Current methods, primarily comparative wood anatomy, are inadequate for conclusive species identification. This study aims to find a set of anatomical characters that distinguish the wood of D. nigra from other commercially important species of Dalbergia from Latin America.
METHODS: Qualitative and quantitative wood anatomy, principal components analysis and naïve Bayes classification were conducted on 43 specimens of Dalbergia, eight D. nigra and 35 from six other Latin American species.
KEY RESULTS: Dalbergia cearensis and D. miscolobium can be distinguished from D. nigra on the basis of vessel frequency for the former, and ray frequency for the latter. Principal components analysis was unable to provide any further basis for separating the species. Naïve Bayes classification using the four characters: minimum vessel diameter; frequency of solitary vessels; mean ray width; and frequency of axially fused rays, classified all eight D. nigra correctly with no false negatives, but there was a false positive rate of 36.36 %.
CONCLUSIONS: Wood anatomy alone cannot distinguish D. nigra from all other commercially important Dalbergia species likely to be encountered by customs officials, but can be used to reduce the number of specimens that would need further study.
Authors:
Peter Gasson; Regis Miller; Dov J Stekel; Frances Whinder; Kasia Zieminska
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Annals of botany     Volume:  105     ISSN:  1095-8290     ISO Abbreviation:  Ann. Bot.     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-12-16     Completed Date:  2010-02-12     Revised Date:  2011-01-04    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  45-56     Citation Subset:  IM    
Affiliation:
Jodrell Laboratory, Royal Botanic Gardens Kew, Kew Road, Richmond, Surrey TW9 3DS, UK. P.Gasson@kew.org
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MeSH Terms
Descriptor/Qualifier:
Bayes Theorem
Classification / methods
Conservation of Natural Resources
Dalbergia / anatomy & histology*,  classification
Principal Component Analysis
Species Specificity
Wood / anatomy & histology*,  classification

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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