Codon-based analysis of selection pressure and genetic structure in the Psammobates tentorius (Bell, 1828) species complex, and phylogeny inferred from both codons and amino acid sequences

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dc.contributor.authorZhao, Z
dc.contributor.authorHeideman, N
dc.contributor.authorHofmeyr, M. D.
dc.date.accessioned2021-09-30T11:05:21Z
dc.date.available2021-09-30T11:05:21Z
dc.date.issued2021
dc.description.abstractThis study used codon analysis (dN/dS and Tv/Ti) to investigate selection pressure and genetic structure in the highly polymorphic Psammobates tentorius species complex, and amino acid sequences to construct a phylogeny tree for it. Our results revealed a strong selection signal at node ‘C2 + C3’, possibly driven by aridity intensification resulting from the development of the Benguela Current. A similar signal was noticed at C3, possibly due to the same driving force. These findings suggest that environmental selection pressure favoured those groups and that further cladogenic events were possible. Selection pressure was also found to be high at C1, C4 and C7, which may indicate that they are also favoured by the current selection pressure. The codon-based phylogeny did not retrieve any potentially undescribed species, but nonetheless provided support for the validity of the seven distinct clades retrieved with the DNA sequence data. The amino acid sequence-based phylogeny generally supported the seven lineages as valid putative species. Investigation at the genomic scale could, however, help to solve the issue. In general, we found the codon, dN, dS, Tv, Ti and amino acid sequence-based phylogenetic inferences useful in species delimitation and recommend their use in species delimitation studies.en_US
dc.identifier.citationZhao, Z., Heideman, N., & Hofmeyr, M. D. (2021). Codon-based analysis of selection pressure and genetic structure in the Psammobates tentorius (Bell, 1828) species complex, and phylogeny inferred from both codons and amino acid sequences. African Journal of Ecology, 59(2), 497–509. https://doi.org/10.1111/aje.12840en_US
dc.identifier.issn13652028
dc.identifier.otherhttps://doi.org/10.1111/aje.12840
dc.identifier.urihttp://hdl.handle.net/10566/6846
dc.publisherJohn Wiley & Sonsen_US
dc.subjectamino acid sequencesen_US
dc.subjectnonsynonymous and synonymous substitutionen_US
dc.subjectsouthern Africaen_US
dc.subjecttransitionen_US
dc.subjecttransversionen_US
dc.titleCodon-based analysis of selection pressure and genetic structure in the Psammobates tentorius (Bell, 1828) species complex, and phylogeny inferred from both codons and amino acid sequencesen_US
dc.typeArticleen_US

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