TY - JOUR
T1 - Conservation genetics of the critically endangered Siamese rosewood (Dalbergia cochinchinensis)
T2 - recommendations for management and sustainable use
AU - Hartvig, Ida
AU - So, Thea
AU - Changtragoon, Suchitra
AU - Tran, Hoa Thi
AU - Bouamanivong, Somsanith
AU - Ogden, Rob
AU - Senn, Helen
AU - Vieira, Filipe Garrett
AU - Turner, Frances
AU - Talbot, Richard
AU - Theilade, Ida
AU - Nielsen, Lene Rostgaard
AU - Kjær, Erik Dahl
PY - 2020
Y1 - 2020
N2 - The highly valuable timber species Dalbergia cochinchinensis is severely threatened due to habitat loss and illegal logging throughout its distribution in mainland Southeast Asia and is listed on CITES Appendix II. This study proposes a strategy for conservation and sustainable management of the species based on assessment of genetic structure within and among natural populations. We developed SNP markers from RAD sequencing and used these in combination with SSR genotypes from a previous study to assess the genetic diversity in 26 populations of D. cochinchinensis across its entire range in Laos, Thailand, Cambodia and Vietnam. The species is able of clonal reproduction and we found that trees closer than 45 meters from each other can be clones. Genetic diversity and clustering analysis showed a clear division of populations into five geographical groups with differing levels of diversity. Assignment tests correctly identified the region of origin for approximately 90% of the samples, which demonstrates that despite a low number of successfully identified SNPs, the SSR + SNP marker panel has the potential for tracking the geographic origin of D. cochinchinensis timber for use in CITES regulation and enforcement. We propose the five identified groups to be considered as Management Units and that conservation and breeding programs should be based on a network of in situ and ex situ conservation stands representing the genetic variation among and within these units. We recommend that conservation efforts are directed towards community owned and managed lands, as this has proven an effective strategy locally.
AB - The highly valuable timber species Dalbergia cochinchinensis is severely threatened due to habitat loss and illegal logging throughout its distribution in mainland Southeast Asia and is listed on CITES Appendix II. This study proposes a strategy for conservation and sustainable management of the species based on assessment of genetic structure within and among natural populations. We developed SNP markers from RAD sequencing and used these in combination with SSR genotypes from a previous study to assess the genetic diversity in 26 populations of D. cochinchinensis across its entire range in Laos, Thailand, Cambodia and Vietnam. The species is able of clonal reproduction and we found that trees closer than 45 meters from each other can be clones. Genetic diversity and clustering analysis showed a clear division of populations into five geographical groups with differing levels of diversity. Assignment tests correctly identified the region of origin for approximately 90% of the samples, which demonstrates that despite a low number of successfully identified SNPs, the SSR + SNP marker panel has the potential for tracking the geographic origin of D. cochinchinensis timber for use in CITES regulation and enforcement. We propose the five identified groups to be considered as Management Units and that conservation and breeding programs should be based on a network of in situ and ex situ conservation stands representing the genetic variation among and within these units. We recommend that conservation efforts are directed towards community owned and managed lands, as this has proven an effective strategy locally.
KW - CITES
KW - Conservation genetics
KW - Dalbergia
KW - Rosewood
KW - Threatened species
KW - Timber species
KW - Tropical trees
U2 - 10.1007/s10592-020-01279-1
DO - 10.1007/s10592-020-01279-1
M3 - Journal article
AN - SCOPUS:85084707057
VL - 21
SP - 677
EP - 692
JO - Conservation Genetics
JF - Conservation Genetics
SN - 1566-0621
ER -