Species identification of Tanzanian antelopes using DNA barcoding

Area of Science:

• Conservation Genetics
• Molecular Ecology
• Zoology

Background:

• Accurate species identification is crucial for wildlife conservation and forensic applications.
• Mitochondrial DNA barcoding, specifically the cytochrome c oxidase subunit I (COI) gene, is a powerful tool for species delineation.

Purpose of the Study:

• To assess the efficacy of the COI barcode for identifying Tanzanian antelope species.
• To determine the utility of short COI fragments for species identification in this group.

Main Methods:

• Sequencing of a 470 base-pair region of the COI gene from 95 specimens across 20 species of Tanzanian antelopes, buffalo, and domestic Bovidae.
• Phylogenetic analyses using the neighbour-joining method to evaluate species clustering and genetic divergence.
• Analysis of sequence divergence within and between species.

Main Results:

• All Tanzanian antelope species formed unique clades with low intra-specific divergence (<1%) and high inter-specific divergence (6.3%-22%).
• The Tragelaphus genus exhibited the lowest interspecific divergence.
• Accurate and highly supported species clustering was achieved even with COI fragments as short as 100 base pairs.

Conclusions:

• The mitochondrial COI barcode is highly effective for the precise identification of Tanzanian antelope species.
• Short COI gene fragments are sufficient for reliable species identification, offering a valuable tool for wildlife conservation and forensic investigations.