barbouri are genetically or environmentally determined, A. barbouri juveniles should be raised in a low-oxygen and predator free environment. If these individuals develop the gills and tail characteristic of A. texanum, we may conclude that the A. barbouri phenotype is a result of environmental influence on development. If these individuals retain the small gills and large tail seen in other A. barbouri, we may conclude that the populations have diverged due to selection for these traits. Additionally, A. texanum juveniles could be raised in a high-oxygen and predator rich environment. Transferring A. texanum individuals into this environment could potentially expose a hidden reaction norm and show how A. barbouri initially
barbouri are genetically or environmentally determined, A. barbouri juveniles should be raised in a low-oxygen and predator free environment. If these individuals develop the gills and tail characteristic of A. texanum, we may conclude that the A. barbouri phenotype is a result of environmental influence on development. If these individuals retain the small gills and large tail seen in other A. barbouri, we may conclude that the populations have diverged due to selection for these traits. Additionally, A. texanum juveniles could be raised in a high-oxygen and predator rich environment. Transferring A. texanum individuals into this environment could potentially expose a hidden reaction norm and show how A. barbouri initially