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Comparative Population Genomics Of Neotropical Forest Birds, Michael Gaston Harvey
Comparative Population Genomics Of Neotropical Forest Birds, Michael Gaston Harvey
LSU Doctoral Dissertations
The causes and implications of differences in geographic variation across species are generally poorly understood, but comparative studies have the potential to provide better understanding of what factors predispose species to undergo population divergence and whether population divergence has lasting evolutionary impacts. Here, I examined geographic variation in birds using molecular data from across the genome. I characterized genetic diversity, estimated population history, and tested for impacts of landscape history as well as ecological traits on genetic parameters. I found evidence that diverse historical processes have led to present-day genetic variation in Neotropical bird species, including divergence, population expansion, migration, …
Evolutionary Relationships Among Fungal Soybean Pathogens And Molecular Marker Development In The Genus Cercospora, Sebastian Albu
Evolutionary Relationships Among Fungal Soybean Pathogens And Molecular Marker Development In The Genus Cercospora, Sebastian Albu
LSU Doctoral Dissertations
Cercospora leaf blight (CLB) and purple seed stain (PSS) are common soybean diseases in the Gulf South of the United States (USA). For nearly a century, Cercospora kikuchii has been considered as the only pathogen causing these diseases. However, previous reports of genetic diversity among isolates collected throughout Louisiana suggested the presence of multiple lineages or species. Recent systematic studies classified species of Cercospora using a taxonomic system based on phylogenetic analysis of five nuclear loci (legacy genes). Using a similar approach, cercosporoid fungi tentatively identified as C. kikuchii were evaluated along with 53 other species of Cercospora. No …
Phylogenetic Tree Construction For Starfish And Primate Genomes Via Alignment Free Methods, Ambujam Krishnan
Phylogenetic Tree Construction For Starfish And Primate Genomes Via Alignment Free Methods, Ambujam Krishnan
LSU Master's Theses
A phylogenetic tree is a tree like diagram showing the evolutionary relationship among various species based on their differences or similarity in their physical or genetic makeup.The similarity in their genetic makeup is traditionally measured based on pairwise distance between their gene sequences using sequence alignment methods. Due to the advancement in next generation sequencing technologies there is a huge amount of datasets available for partially or completely sequenced genomes. These massive datasets requires a faster comparison methods other than the traditional alignment-based approaches. Therefore, alignment free approaches are gaining popularity in recent years. In this thesis, we compare alignment-based …