Alkaloids alkaloid Animals Cactaceae Cactus Drosophila Drosophila buzzatii RNA-Seq Adaptation, Physiological Analysis of Variance Dose-Response Relationship, Drug Drosophila koepferae Environment adaptation Fluctuating asymmetry Hormesis Host Specificity Host shifts Mescaline Models, Biological Opuntia sulphurea Phenotypic plasticity Plasticity Regression Analysis Robustness Trichocereus terschekii Venation pattern Viability Wing Wing morphology adult