Nuclear introns help unravel the diversification history of the Australo-Pacific Petroica robins

Publication date: Available online 25 October 2018Source: Molecular Phylogenetics and EvolutionAuthor(s): Anna M. Kearns, John F. Malloy, Matthias K. Gobbert, Aude Thierry, Leo Joseph, Amy C. Driskell, Kevin E. OmlandAbstractAustralo-Pacific Petroica robins are known for their striking variability in sexual plumage coloration. Molecular studies in recent years have revised the taxonomy of species and subspecies boundaries across the southwest Pacific and New Guinea. However, these studies have not been able to resolve phylogenetic relationships within Petroica owing to limited sampling of the nuclear genome. Here, we sequence five nuclear introns across all species for which fresh tissue was available. Nuclear loci offer support for major geographic lineages that were first inferred from mtDNA. We find almost no shared nuclear alleles between currently recognized species within the New Zealand and Australian lineages, whereas the Pacific robin radiation has many shared alleles. Multilocus coalescent species trees based on nuclear loci support a sister relationship between the Australian lineage and the Pacific robin radiation—a node that is poorly supported by mtDNA. We also find discordance in support for a sister relationship between the similarly plumaged Rose Robin (P. rosea) and Pink Robin (P. rodinogaster). Our nuclear data complement previous mtDNA studies in suggesting that the phenotypically cryptic eastern and western populations of Australia’s Scarlet Robin (P....
Source: Molecular Phylogenetics and Evolution - Category: Molecular Biology Source Type: research