BIEB 166 Lecture Notes - Ocelot, Sex Pheromone, Lycaenidae
8 Nov 2013
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Document Summary
Contrasts between olfaction vs sound and light signals. Lost a short distance away from the source. Lighter molecules evaporate more rapidly than heavier molecules. Good, often a direct measure of the internal state of the animal. Pattern preserved through the eye of the organism. Can occur in the simplest form of organisms. When they are having sex, they send a series of chemical signals that are perceived by receptors on the cell. In vertebrates, the brain plays a key role. Hypothalamus -> pituitary gland -> produce hormones to circulate in the body -> affect different organs to produce other hormones. Produce chemical signals to attract ants to attack the wasps (predator) Looking for pheromones, lots of by-products of testosterones. Determine if the male is in good reproductive status. Chemical characteristics of pheromones depend on medium and method of transmission. Must be light in order to diffuse through air. Produced by the females shortly after they emerges from her silk coon.
