Knowledge Resource Center for Ecological Environment in Arid Area
| Phylogeography of Pogonomyrmex barbatus and P. rugosus Harvester Ants: A Complex Regional History of Ancient Vicariance and Recent Expansion in Arid- Adapted Insects, and Implications for the Success of Cryptic Hybrid Lineages with GCD | |
| [null] | |
| 出版年 | 2012 |
| 学位授予单位 | Mott, Brendon Michael (Author), Gadau, Juergen (Advisor), Fewell, Jennifer (Committee member), Anderson, Kirk (Committee member), Arizona State University (Publisher) |
| 英文摘要 | abstract: Here I present a phylogeographic study of at least six reproductively isolated lineages of harvester ants within the Pogonomyrmex barbatus and P. rugosus species group. The genetic and geographic relationships within this clade are complex: four of the identified lineages are divided into two pairs, and each pair has evolved under a mutualistic system that necessitates sympatry. These paired lineages are dependent upon one another because interlineage matings within each pair are the sole source of hybrid F1 workers; these workers build and sustain the colonies, facilitating the production of the reproductive caste, which results solely from intralineage fertilizations. This system of genetic caste determination (GCD) maintains genetic isolation among these closely related lineages, while simultaneously requiring co-expansion and emigration as their distributions have changed over time. Previous studies have also demonstrated that three of the four lineages displaying this unique genetic caste determination phenotype are of hybrid origin. Thus, reconstructing the phylogenetic and geographic history of this group allows us to evaluate past insights and plan future inquiries in a more complete historical biogeographic context. Using mitochondrial DNA sequences sampled across most of the morphospecies' ranges in the U.S. and Mexico, I employed several methods of phylogenetic and DNA sequence analysis, along with comparisons to geological, biogeographic, and phylogeographic studies throughout the sampled regions. These analyses on Pogonomyrmex harvester ants reveal a complex pattern of vicariance and dispersal that is largely concordant with models of late Miocene, Pliocene, and Pleistocene range shifts among various arid-adapted taxa in North America. Dissertation/Thesis M.S. Biology 2012 |
| 英文关键词 | Biology Molecular biology Ecology Biogeography Genetic Caste Determination Hybridization North America Phylogeography Pogonomyrmex |
| 语种 | 英语 |
| URL | http://hdl.handle.net/2286/R.I.15208 |
| 来源机构 | Arizona State University |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/246628 |
| 推荐引用方式 GB/T 7714 | [null]. Phylogeography of Pogonomyrmex barbatus and P. rugosus Harvester Ants: A Complex Regional History of Ancient Vicariance and Recent Expansion in Arid- Adapted Insects, and Implications for the Success of Cryptic Hybrid Lineages with GCD[D]. Mott, Brendon Michael (Author), Gadau, Juergen (Advisor), Fewell, Jennifer (Committee member), Anderson, Kirk (Committee member), Arizona State University (Publisher),2012. |
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