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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 …
Diversification And Biogeography Of Neotropical Cichlids, Caleb D. Mcmahan
Diversification And Biogeography Of Neotropical Cichlids, Caleb D. Mcmahan
LSU Doctoral Dissertations
The diversity of fishes in the Neotropics consists of nearly 6,000 species, approximately 10% of all vertebrate species on the planet. Evolutionary patterns and processes in fishes are often quite distinct from terrestrial biota, and the study of freshwater fishes can offer insight into understanding evolution and biogeography of regions. One of the major lineages of neotropical freshwater fishes, family Cichlidae, consist of over 500 species in the Neotropics but over 1,600 species overall. The aim of this study is to (1) assess diversification patterns within the family, with a focus on neotropical clades, (2) reassess phylogenetic relationships among northern …