Narrow hybrid zone between two subspecies of big sagebrush (Artemisia tridentata: Asteraceae) : XII. Galls on sagebrush in a reciprocal transplant garden.

摘要: Several species of gall-forming insects specialize on big sagebrush (Artemisia tridentata), a that shows much clinal and subspecific variation throughout its geographic range. Two those subspecies, basin (A. t. ssp. tridentata) mountain vaseyana), form narrow hybrid zone at Salt Creek, Utah. Reciprocal transplant experiments have shown the Creek are more fit than either parental but only in zone. Do genotype environment influence density distribution galls sagebrush? We counted three reciprocal gardens Creek. Gardens were each two zones Transplanted seedlings came from five source populations: populations. identified seven kinds flies (Rhopalomyia midges Eutreta fruitflies) produced identifiable galls. Densities varied among populations, there was also significant garden by interaction gall density. In general, (i.e., environments) greater populations genotypes). Nevertheless, genotype-environment interactions observed for Overall galls, mostly due to Rhopalomyia ampullaria, greatest high-elevation (mountain) least low-elevation (basin) garden. To best our knowledge, this is first experiment addressing herbivore richness