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Full-Text Articles in Life Sciences

Glossina Swynnertoni (Diptera: Glossinidae): Effective Population Size And Breeding Structure Estimated By Mitochondrial Diversity, J. G. Marquez, I. I. Malele, J. O. Ouma, E. S. Krafsur Aug 2006

Glossina Swynnertoni (Diptera: Glossinidae): Effective Population Size And Breeding Structure Estimated By Mitochondrial Diversity, J. G. Marquez, I. I. Malele, J. O. Ouma, E. S. Krafsur

Entomology Publications

Nucleotide diversity was examined at mitochondrial COI and r16S2 loci in eight Glossina swynnertoni Austen collections from northern Tanzania and from a culture maintained by the International Atomic Energy Agency. Eighteen composite haplotypes were observed among 149 flies, two of which were common to all samples and 10 were private. Mean haplotype diversity was 0.59 and nucleotide diversity was 0.0013. There were excess singular haplotypes and mutation-drift disequilibrium suggesting that populations had experienced an earlier bottleneck and subsequent expansion. Factorial correspondence analysis showed that haplotype frequencies varied much more temporally (GST = 0.18) than spatially (GST = 0.04 ...


Molecular Genetic Variation Of Boll Weevil Populations In North America Estimated With Microsatellites: Implications For Patterns Of Dispersal, Kyung Seok Kim, Thomas W. Sappington May 2006

Molecular Genetic Variation Of Boll Weevil Populations In North America Estimated With Microsatellites: Implications For Patterns Of Dispersal, Kyung Seok Kim, Thomas W. Sappington

Entomology Publications

The boll weevil (Anthonomus grandis Boheman) is an insect pest of cotton that underwent a well-documented range expansion across the southeastern U.S. from Mexico beginning about 110 years ago. Eleven microsatellite loci were surveyed to infer the magnitude and pattern of genetic differentiation among boll weevil populations from 18 locations across eight U.S. states and northeast Mexico. Estimates of genetic diversity (allelic diversity and heterozygosity) were greater in Southern than Northern populations, and were greater in the west than the east among Northern populations. Boll weevil populations were genetically structured as a whole across the geographic range sampled ...


Microgeographical Breeding Structure Of The Tsetse Fly, Glossina Pallidipes In South‐Western Kenya, J. O. Ouma, J. G. Marquez, E. S. Krafsur Mar 2006

Microgeographical Breeding Structure Of The Tsetse Fly, Glossina Pallidipes In South‐Western Kenya, J. O. Ouma, J. G. Marquez, E. S. Krafsur

Entomology Publications

The origins of extant G. pallidipes Austen (Diptera: Glossinidae) populations in the ecologically well studied Lambwe and Nguruman valleys in Kenya are controversial because populations have recovered after seemingly effective attempts to achieve high levels of control. We investigated microgeographic breeding structure of the tsetse fly, Glossina pallidipes (Diptera: Glossinidae) by analyzing spatial and temporal variation at eight microsatellite loci to test hypotheses about endemism and immigration. Samples were obtained at seasonal intervals from trap sites separated by 200 m to 14 km and arranged into blocks. G. pallidipes populations nearest to Lambwe and Nguruman also were sampled. Spatial analysis ...


Linking Direct And Indirect Data On Dispersal: Isolation By Slope In A Headwater Stream Salamander, Winsor H. Lowe, Gene E. Likens, Mark A. Mcpeek, Don C. Buso Feb 2006

Linking Direct And Indirect Data On Dispersal: Isolation By Slope In A Headwater Stream Salamander, Winsor H. Lowe, Gene E. Likens, Mark A. Mcpeek, Don C. Buso

Open Dartmouth: Faculty Open Access Scholarship

There is growing recognition of the need to incorporate information on movement behavior in landscape-scale studies of dispersal. One way to do this is by using indirect indices of dispersal (e.g., genetic differentiation) to test predictions derived from direct data on movement behavior. Mark–recapture studies documented upstream-biased movement in the salamander Gyrinophilus porphyriticus (Plethodontidae). Based on this information, we hypothesized that gene flow in G. porphyriticus is affected by the slope of the stream. Specifically, because the energy required for upstream dispersal is positively related to slope, we predicted gene flow to be negatively related to change in ...