Identifying hybrids & the genomics of hybridization : Mallards & American black ducks of Eastern North America

摘要: Resolving evolutionary relationships and establishing population structure depends on molecular diagnosability that is often limited for closely related taxa. Here, we use 3,200 ddRAD-seq loci across 290 mallards, American black ducks, putative hybrids to establish estimate hybridization rates. We test between traditional assignment probability accumulated recombination events based analyses assign generational classes. For hybrid identification, report the distribution of complements ADMIXTURE simulation by extending resolution past F4 status; however, caution against due an inability resolve F1 hybrids. Nevertheless, both suggest there are relatively few backcrossed stages before a lineage's ancestry lost offspring effectively parental again. conclude despite high rates observed interspecific mallards ducks in middle part 20th century, our results do not support predicted swarm. Conversely, mallard samples genetically assigned western non-western clusters. indicate these likely originated from game-farm stock, suggesting landscape level gene flow domestic wild conspecifics.