Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Demography (1)
- Desmognathus salamanders (1)
- Divergence with gene flow (1)
- Ecological speciation (1)
- Gene Tree - Species Tree Discordance (1)
-
- Global change (1)
- Host-associated divergence (1)
- Introgression (1)
- Isolation-by-distance (1)
- Isolation-by-environment (1)
- Lednia tumana (1)
- Lineage boundaries (1)
- Lissamphibia (1)
- Microbial ecology (1)
- Mitochondrial discordance (1)
- Molecular Evolution (1)
- Neodiprion sawflies (1)
- Population Genomics (1)
- Population genetics (1)
- Species Delimitation (1)
Articles 1 - 4 of 4
Full-Text Articles in Life Sciences
Mitochondrial And Nuclear Patterns Of Conflict And Concordance At The Gene, Genome, And Behavioral Scales In Desmognathus Salamanders, Justin D. Kratovil
Mitochondrial And Nuclear Patterns Of Conflict And Concordance At The Gene, Genome, And Behavioral Scales In Desmognathus Salamanders, Justin D. Kratovil
Theses and Dissertations--Biology
Advancements in molecular sequencing have revealed unexpected cryptic genetic diversity and contrasting evolutionary histories within genes and between genomes of many organisms; often in disagreement with recognized taxonomy. Incongruent patterns between the mitochondrial and nuclear evolutionary history can have several plausible explanations, but widespread systematic conflict inevitably challenges our conceptions of species boundaries when there is discordance between coevolving and coinherited genomes. It is unknown to what degree mitonuclear conflict drives the process of divergence, or how ubiquitous these patterns are across the tree of life. To understand the evolutionary relevance of intergenomic discordance we must identify the conflicting patterns …
Genetic Perspectives On Biodiversity In Rocky Mountain Alpine Streams, Scott Hotaling
Genetic Perspectives On Biodiversity In Rocky Mountain Alpine Streams, Scott Hotaling
Theses and Dissertations--Biology
In alpine regions worldwide, climate change is dramatically altering ecosystems, affecting biodiversity across habitats and taxonomic scales. For streams, the associated recession of mountain glaciers and snowfields, paired with altered precipitation regimes, are driving shifts in hydrology, species distributions, and basal resources – often threatening the very existence of some habitats and biota. Globally, alpine streams harbor particularly substantial species and genetic diversity due to significant habitat insularity and environmental heterogeneity: however, anthropogenic warming threatens to homogenize habitats through the reduction of the cryosphere, thereby reducing biodiversity from micro- to macroscopic organisms and genes to communities. Still, alpine stream biodiversity, …
Examining The Role Of Host Use On Divergence In The Redheaded Pine Sawfly, Neodiprion Lecontei, Across Multiple Spatial Scales, Robin Kimberly Bagley
Examining The Role Of Host Use On Divergence In The Redheaded Pine Sawfly, Neodiprion Lecontei, Across Multiple Spatial Scales, Robin Kimberly Bagley
Theses and Dissertations--Biology
Phytophagous insects make up over one quarter of described species on Earth, and this incredible diversity seems directly linked to feeding on plants. Comparative studies of sister groups have shown shifts to herbivory are consistently associated with increased species diversity in insects, but the reasons for this diversification remain unclear. While other explanations, such as decreased extinction rates or influences on population structure, exist, one prominent hypothesis suggests shifts and subsequent adaptation to novel host plants can lead to the evolution of reproductive barriers.
Given their extreme specialization on host plants in the genus Pinus and intimate, life-long association with …
Genomic Perspectives On Amphibian Evolution Across Multiple Phylogenetic Scales, Paul Michael Hime
Genomic Perspectives On Amphibian Evolution Across Multiple Phylogenetic Scales, Paul Michael Hime
Theses and Dissertations--Biology
Genomes provide windows into the evolutionary histories of species. The recent accessibility of genome-scale data in non-model organisms and the proliferation of powerful statistical models are now providing unprecedented opportunities to uncover evolutionary relationships and to test hypotheses about the processes that generate and maintain biodiversity. This dissertation work reveals shallow-scale species boundaries and population genetic structure in two imperiled groups of salamanders and demonstrates that the number and information content of genomic regions used in species delimitation exert strong effects on the resulting inferences. Genome scans are employed to test hypotheses about the mechanisms of genetic sex determination in …