Shedko S.V.
В журнале Russian Journal of Genetics
Год: 2022 Том: 58 Номер: 6 Страницы: 718–729
Bayesian dating of the phylogeny of Acipenseridae is performed on the basis of a combined matrix of molecular (mitogenome) and morphological characters compiled for recent and fossil Acipenseriformes species. It has been estimated that the ancestral lineages of Polyodontidae and Acipenseridae diverged at approximately 162 Ma (195–137 Ma). The divergence of lineages in the crowns of recent Polyodontidae and Acipenseridae began almost simultaneously during the transition from the Cretaceous to Paleogene: 72 Ma (95–55 Ma) and 68 Ma (93–47 Ma), respectively. The main groups of lineages of recent Acipenseridae were formed in the Oliocene–Miocene. The median age of extant Acipenseridae species is 5.2 Ma. Genome-wide duplications in Acipenseridae occurred at different time periods. In the common ancestor of the Pacific sturgeon species, this happened at approximately 65–36 Ma, and in the common ancestor Acipenser fulvescens, A. brevirostrum, A. gueldenstaedtii, and A. baerii, about 29–15 Ma. The transition from the 4n to the 6n genome state in the A. brevirostrum lineage occurred in the second half of the Miocene or later. The rate of divergence for the entire mitogenome, a mitogenome without a D-loop, sequences of protein genes, and a D-loop was 0.282 ± 0.071, 0.151 ± 0.004, 0.186 ± 0.014, and 2.656 ± 1.192 percent nucleotide substitutions per million years, respectively. The limited applicability of the term “living fossil” to the Acipenseridae species is shown.
