Graduate Thesis Or Dissertation

 

Phylogenetic Studies in Tenebrionidae (Coleoptera) and Related Families Public Deposited

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qj72pd34k

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  • In this dissertation, I present the results from three studies: (1) a phylogeny of Tenebrionoidea (Coleoptera) inferred from a seven-gene dataset derived from PCR and Sanger sequencing; (2) a phylogeny of Tenebrionidae, the largest family in Tenebrionoidea, inferred from a four-gene dataset also derived from PCR and Sanger sequencing; (3) a phylogenomic study of Core Pimeliinae, a large clade comprising roughly half of Tenebrionidae, using partial transcriptomes sequenced with high-throughput sequencing. These groups have historically received very little attention from systematists, and current hypotheses of phylogenetic relationships are largely derived from analyses of morphological characters. The first two studies, which used Sanger sequence-derived datasets, yielded very poor resolution of deeper nodes. I explored two potential sources for this lack of resolution: (1) rogue taxa; (2) data partitions with non-stationary sites. Modifying the datasets to account for these potential sources of noise increased the overall resolution of the phylogenies, though many deeper nodes still remained poorly resolved. In my third study, in which I use high-throughput sequencing to sequence partial transcriptomes for 28 taxa (22 Core Pimeliinae, 5 other Tenebrionidae, 1 Zopheridae), I recovered 1,557 single-copy nuclear protein-coding genes shared between most taxa. I analyzed a concatenated dataset containing all of these genes using maximum likelihood (ML) and SVD quartets tree inference methods and recovered congruent, fully supported topologies for Core Pimeliinae. A rarefaction study, in which I concatenated smaller numbers of genes, suggests that as few as 400 genes may suffice for inferring the phylogeny of Core Pimeliinae. Taken together, the results of these three studies greatly increases our understanding of phylogenetic relationships among Tenebrionidae and related families in the superfamily Tenebrionoidea and contribute towards establishing a phylogenetically informed classification for these groups.
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  • 2017-11-06 to 2018-03-26

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