- 期刊
Mitochondrial DNA Variations in Sibling Species of the Bulinus truncatus/tropicus Complex in Lake Albert, Western Uganda
並列摘要
Thirty-nine snail samples morphologically conforming to the Bulinus truncatus/tropicus species complex were collected from 5 populations (Booma, Bugoigo, Piida, Toonya, and Walukuba) on Lake Albert, western Uganda. Analysis of patterns of sequence variations and evolutionary relationships within and between localities using a 612 bp fragment of the mitochondrial cytochrome oxidase subunit I (COI) gene revealed 5 unique haplotypes defined by 21 polymorphic sites. The Bayesian and medianjoining network phylogenetic reconstructions partitioned the haplotypes into 2 reciprocally monophyletic clades concordant with B. truncatus and B. tropicus separated by 18 mutational substitutions, corresponding to a 3.0% net sequence divergence. Sequence divergences between haplotypes ranged 0.2%-3.5%, and significant genetic differentiation was observed in 5 of the 6 population pairwise comparisons. The 2 sibling species were sympatric in only 1 locality, at Piida. Our results confirm the existence of 2 evolutionary lineages of the Bulinus truncatus/tropicus species in Lake Albert and underscore the utility of the mitochondrial COI gene in differentiating between sibling species of the B. truncatus/tropicus complex which are otherwise indistinguishable based on the shell morphology.
延伸閱讀
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