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THE INTERFACE BETWEEN PHYLOGENETICS AND POPULATION GENETICS: INVESTIGATING GENE TREES, SPECIES TREES, AND POPULATION DYNAMICS IN THE PHYLLOPHAGA FRATERNA SPECIES GROUP

This study uses traditional and contemporary phylogenetic and population genetic analyses to assess the causes of discordance (i.e., lineage sorting and introgression) among mitochondrial and nuclear gene trees for a clade of eastern North American scarab beetles (fraterna species group, genus Phyllophaga). I estimated gene trees using individual and combined analysis of one mitochondrial and two nuclear loci in MrBayes, and inferred a species tree using a hierarchical coalescent approach based on all loci in the program Best. Because hybridization violates the assumptions of Best, I tested for introgression by comparing species monophyly between the mitochondrial and nuclear gene trees based on the prediction that cytoplasmic genomes introgress more readily than nuclear genomes. Haplotype exclusivity was identified using Bayesian tests of monophyly and the genealogical sorting index. I used the results of the phylogenetic analyses and monophyly tests to develop an explicit hypothesis of introgression that could be tested in the program IMa. Results from these analyses provided evidence for introgression across clades within the fraterna group. The tiered analytical approach used in this study demonstrated how the use of multiple methods can identify when assumptions are violated and methods are prone to yield misleading results.