|Title||Highly polymorphic microsatellites in the North American snakeweed grasshopper, Hesperotettix viridis|
|Publication Type||Journal Article|
|Year of Publication||2009|
|Authors||Grace, T, Joern, A, Brown, SJ, Apple, JL, Wisely, SM|
|Journal||Journal of Orthoptera Research|
|Keywords||Hesperotettix viridis, host-associated divergence, local adaptation, microsatellite markers, snakeweed grasshopper|
Microsatellite markers are preferred for fine-scale population genetic studies requiring high resolution. The grasshopper Hesperotettix viridis (Thomas) is an oligophagous species that feeds on composites and often exhibits locally restricted diets. Divergence in host plant use in some localities is seen where co-occurring subpopulations select alternate plant species, as expected with the evolution of host shifts and associated lineage divergence. To characterize the host-associated divergence patterns among populations of H. viridis, we developed markers from two microsatellite-enriched genomic libraries. Here we report the characterization and optimization of seven polymorphic di- and tri-nucleotide microsatellite loci for this species. One hundred and six individuals from 5 populations were tested for polymorphism. The number of alleles varied from 4 to 38 in all the populations. Ho ranged from 0.339 to 0.790. Homozygote excess was observed across loci, perhaps due to inbreeding. This is the first report of microsatellite markers for the subfamily Melanoplinae.