| the importance of the ontogenetic niche in resource-associated divergence: evidence from a generalist grasshopper. | geographic variation in resource use can produce locally adapted populations that exhibit genetic and phenotypic divergence. in the bird-winged grasshopper (schistocerca emarginata = [lineata]), we investigate whether genetic data exist in accordance with geographic variation in resource (host) use and coloration. in texas, juvenile grasshoppers feed almost exclusively on one of two host plants, rubus trivialis (rosaceae) or ptelea trifoliata (rutaceae), whereas adults of both forms are dietary ... | 2002 | 12038531 |