BIOL-4777EL Lecture Notes - Lecture 3: September Equinox, Courtship Display, Winter Solstice
15 Feb 2018
School
Department
Course
Professor
Document Summary
Aggression, threat, cooperative, appeasement, escape: genetic relatedness, friendlier towards each other. Familiarity: friendly in the same room due to the colony smell. Two ways to approach a question (why do birds sing in the spring?) Proximal approach - how: photoperiods > pineal glands > releasing factors > pituitary gland > gonadotropins (fsh, lh) > gonads > steroid hormones (testosterone, estrogen, etc. ) Visual perception (light: only 3 out of 11 phyla have image forming eyes. Arthropods, molluscs, vertebrates: light, wavelength, intensity, polarity, photoperiod (amount of light per day) [spring equinox mar 23 12/12, summer solstice jun 21 longest day, fall equinox sep 23 12/12, winter solstice dec 22 shortest day, light spectrum. Air: all colours: water: red end of spectrum, absorbs quickly; below 30 feet, world is blue; very deep, no light, sh etc. produce light, honey bee. See 12 shades of blue: sphinx moth. Pollinates red owers: indian luna moth, olive green in colour.
