Phylogenetic status and timescale for the diversification of Steno and Sotalia dolphins

• Autor(a) principal: Cunha, Haydée A.
• Data de Publicação: 2011
• Outros Autores: Moraes, Lucas C., Medeiros, Bruna V., Lailson-Brito, José, Silva, Vera Maria Ferreira da, Solé-Cava, António Mateo, Schrago, Carlos Guerra
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional do INPA
• Texto Completo: https://repositorio.inpa.gov.br/handle/1/14729
• topic: Animals Tissue; Bayes Theorem; Cladistics; Delphininae; Dolphin; Evolution; Feresa; Fossil; Globicephalinae; Grampus; Maximum Likelihood Method; Genome, Mitochondrial; Molecular Clock; Molecular Phylogeny; Nonhuman; Nucleotide Sequence; Orcaella; Orcinus; Peponocephala; Pseudorca; River Basin; Sotalia; Sousa; Species Diversity; Stenon; Stenoninae; Animals; Biological Model; Calibration; Cetacea; Dna Sequence; Dolphin; Genetics; Genome, Mitochondrial; Evolution, Molecular; Molecular Genetics; Phylogeny; Physiology; South America; Statistical Model; Time; Dna, Mitochondrial; Animalss; Bayes Theorem; Biological Evolution; Calibration; Cetacea; Dna, Mitochondrial; Dolphins; Evolution, Molecular; Genome, Mitochondrial; Likelihood Functions; Models, Biological; Models, Statistical; Molecular Sequence Data; Phylogeny; Sequence Analysis, Dna; South America; Time Factors

Molecular data have provided many insights into cetacean evolution but some unsettled issues still remain. We estimated the topology and timing of cetacean evolutionary relationships using Bayesian and maximum likelihood analyses of complete mitochondrial genomes. In order to clarify the phylogenetic placement of Sotalia and Steno within the Delphinidae, we sequenced three new delphinid mitogenomes. Our analyses support three delphinid clades: one joining Steno and Sotalia (supporting the revised subfamily Stenoninae); another placing Sousa within the Delphininae; and a third, the Globicephalinae, which includes Globicephala, Feresa, Pseudorca, Peponocephala and Grampus. We also conclude that Orcinus does not belong in the Globicephalinae, but Orcaella may be part of that subfamily. Divergence dates were estimated using the relaxed molecular clock calibrated with fossil data. We hypothesise that the timing of separation of the marine and Amazonian Sotalia species (2.3 Ma) coincided with the establishment of the modern Amazon River basin. © 2011 Cunha et al.