A multi-locus approach to discern conservation units and adaptive potential of Pacific Black Ducks across Australia and surrounding islands
- 3 April 2021
- journal article
- research article
- Published by Taylor & Francis Ltd in Emu - Austral Ornithology
- Vol. 121 (1-2), 124-135
- https://doi.org/10.1080/01584197.2021.1911601
Abstract
Genetic diversity, population delineation and rates of gene flow can be used to help understand long-term population dynamics, which is important for conserving species with fragmented distributions. Here, we sequenced 19 nuclear introns (nuDNA) and a portion of mitochondrial DNA (mtDNA) across three subspecies of Pacific black ducks (Anas superciliosa ssp.; NmtDNA = 162; NnuDNA = 49) from Australia and surrounding islands in order to measure levels of genetic structure and gene flow. First, despite evidence of gene flow from Australia, Pacific black ducks from the Solomon Islands were significantly differentiated from all other groups in both mtDNA and nuDNA. This is probably due to genetic drift resulting in lowered genetic diversity. We found the lowest levels of genetic differentiation between locations sampled in Australia, suggesting strong connectivity across the continent. Despite elevated differentiation in mtDNA between Australia and other islands (i.e. Timor, New Zealand), low nuDNA divergence suggests some connectivity. Such marker discord is common among waterfowl and is likely due to male-biased dispersal from Australia. Finally, mtDNA of Pacific black ducks from New Zealand showed introgression of haplotypes from feral mallards (A. platyrhynchos), which were established in the 1800s. Overall, these data suggest that A. superciliosa ssp. consist of three distinct genetic units that correspond with subspecies classifications and require individual conservation planning.Keywords
This publication has 86 references indexed in Scilit:
- Bioclimatic and physical characterization of the world’s islandsProceedings of the National Academy of Sciences of the United States of America, 2013
- STRUCTURE HARVESTER: a website and program for visualizing STRUCTURE output and implementing the Evanno methodConservation Genetics Resources, 2011
- The Divergence of Chimpanzee Species and Subspecies as Revealed in Multipopulation Isolation-with-Migration AnalysesMolecular Biology and Evolution, 2009
- Isolation with Migration Models for More Than Two PopulationsMolecular Biology and Evolution, 2009
- A global assessment of endemism and species richness across island and mainland regionsProceedings of the National Academy of Sciences of the United States of America, 2009
- adegenet: a R package for the multivariate analysis of genetic markersBioinformatics, 2008
- Mitochondrial DNA under siege in avian phylogeographyMolecular Ecology, 2008
- Inference of population structure using multilocus genotype data: dominant markers and null allelesMolecular Ecology Notes, 2007
- Integration within the Felsenstein equation for improved Markov chain Monte Carlo methods in population geneticsProceedings of the National Academy of Sciences of the United States of America, 2007
- Application of Phylogenetic Networks in Evolutionary StudiesMolecular Biology and Evolution, 2005