Abstract
M.Sc. (Botany)
Global efforts to protect the world’s forests from unsustainable and inequitable
exploitation have been undermined in recent years by rampant illegal logging in many
timber-producing countries. A prerequisite for efficient control and seizure of illegally
harvested forest product is a rapid, accurate and tamper proof method of species
identification. DNA barcoding is one such a tool, relatively simple to apply. It is
acknowledged to bring about accuracy and efficiency in species identification. In this
study a DNA barcode reference library for traded and protected tree species of southern
Africa was developed comprising of 81 species and 48 genera. Four primary analyses
were conducted to assess the suitability of the core barcodes as a species identification
tool using the R package Spider 1.2-0. Lastly, to evaluate this identification tool, query
specimens independently sampled at a Mozambican logging concession were identified
using DNA barcoding techniques. The nearest neighbour (k-NN) and best close match
(BCM) distance based parameter yielded 90% and 85% identification success rate using
the core plant barcodes respectively. DNA barcoding identification of query specimens
maintained a constant 83% accuracy over the single marker dataset and the combined
dataset. This database can serve as a backbone to a control mechanism based on DNA
techniques for species identification and also advance the ability of relevant authorities
to rapidly identify species of timber at entry and exit points between countries with
simple, fast, and accurate DNA techniques.