Biology 3601A/B Lecture Notes - Lecture 13: Anterior Pituitary, Adrenal Gland, Autonomic Nervous System
2 Nov 2018
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Document Summary
Stress response: the response of an animal to a threatening situation. Predator-induced phenotypic plasticity: predator presence causes the changing of phenotype or morphology within an organism to decrease chances of predation, presumably these morphologic changes come with some cost, only present when predator stress is present. Glucocorticoids (cort: main stress hormones vary in different animal groups, tadpoles stress hormone: corticosterone, human stress hormone: cortisol, steroid hormones nonpolar, have intracellular receptors, cholesterol precursor. Implies there is some role of this corticosterone pathway in the process of phenotypic plasticity: u(cid:374)sure ho(cid:449) this (cid:449)orks , but just evidence that the pathway is involved. Ponds with more predators have more stressed tadpoles. More predators = more stress: significant relationship between whole body cort and the biomass of predators, also, positively correlated with snails. Indicates a little parasite influence on stress: not correlated with competitor biomass, no relationship between competitors and stress, note: units picograms/gram, 10-9, very small.
