Chemical ecology is, of course, responsible for adaptive evolution via ecological, social, neurogenic, and socio-cognitive niche construction (i.e., brain development). How could anything else but chemicals (nutrient chemicals and pheromones) be responsible for similarities and differences in cell types of the brain in different species?
What did the early ethologists think was responsible for nutrient acquisition in surviving avian species?
…nutrient chemicals establish the ecological niche of different bacterial species and that nutrient calibrated receptor-mediated events link the metabolism of nutrients to pheromones that standardize and control speciation
The molecular biology of how nutrient chemicals calibrate the survival of individuals and how the metabolism of nutrients to pheromones that standardizes and controls species survival appears to link the nature and nurture of receptor-mediated behavioral development across species.
Does anyone know how else to link the social environment directly to brain changes and behavior in invertebrates or vertebrates? In the honeybee and in rodents it appears that olfactory/pheromonal stimuli provide this direct link.
…food odors and pheromones cause the electrical activation of genes in nerve cells of brain tissue. This links them directly to behavior via the required gene, cell, tissue, organ, organ system pathway (Kohl, submitted).