BIEB 166 Lecture 24 (WI13)

4 Pages
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Department
Biol/Ecology, Behavior, & Evol
Course Code
BIEB 166
Professor
James Nieh

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Description
Lecture 24 Introduction Contrasts between olfaction VS sound and light signals Features Sound Light Olfactory Directionality Relatively Relatively Straight Very irregular path straight -Diffusion -Transmitted through turbulent air Speed Medium Fast Slow -Diffusion Temporal Pattern Retained Retained Lost a short distance away -Pattern preserved through from the source the eye of the organism -Irregular (distorted) signal Spectrum Yes, use Yes, use Fourier Analysis No, must analyze in a Fourier different way Analysis -Mass spectroscopy -Harder to analyze Persistence Short Does not persist at all Can be very long, provides a -Is gone once the producer clock stopped -For days/weeks -Lighter molecules evaporate more rapidly than heavier molecules Honest signaling Can be good Can be good Good, often a direct measure -Sexual selection of the internal state of the -Brood parasites animal Difficult to bluff Chemical signaling - Probably the oldest form of biological communication ○ Can occur in the simplest form of organisms Yeast - When they are having sex, they send a series of chemical signals that are perceived by receptors on the cell 1. Hormones - Transmitted within a body - 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 Testosterones, estrogens 2. Allomones - Sent between different species (interspecific) Lycaenid caterpillar & ant - Blue color from interference coloration - The ant is the caterpillar's protector - Produce chemical signals to attract ants to attack the wasps (predator) - Secretes a drop of honeydew (sugar solution) - Mutualism 3. Pheromones 3. Pheromones - Communication within a species (intraspecific) Silk moth Pheroboar - Artificial - Stimulate the female pigs to ovulate Deers - Urinalysis - Females are sampling the males' urine - Looking for pheromones, lots of by-products of testosterones - Determine if the male is in good reproductive status - Stimulates own ovulation Ocelots - Accidentally attracted by men perfume - Compound similar to male ocelot Production and release of pheromones Chemical characteristics of pheromones depend on medium and method of transmission Medium 1. Air-borne pheromones - Must be light in order to diffuse through air Silk moth - Bombykol - Produced by the females shortly after they emerges from her silk coon - Diffuses through the air, attracts male 2. Water-borne pheromones - Aquatic organisms - S
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