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Unformatted text preview: 1 PSY 3364 Animal Communication Oct 13, 2010 Human pheromones? • Electrical activity in VNO tissue in response to chemical stimulation Vomeronasal organ Vomeronasal nerves Hippocampus Olfactory nerves Olfactory tract Human pheromones? • Chemicals found in sweat and other human secretions appear to affect mood • Infants appear to distinguish breast pads worn by their mothers from other mothers • Menstrual “synchrony” seen in women who live or work together Pheromones and immune system • Major Histocompatibility Complex (MHC) • Mice (even highly inbred mice) tend to choose mates that differ from them in terms of the MHC. • Animals probably detect information about MHC through odors or odor-pheromone mixture Sex pheromone mimicry • “Sex pheromone mimic lures two moths to their doom” (Science, 24 June 2002) • Bolas spiders – do not build webs, but sling a single strand of silk across a gap and a a single strand of silk across a gap and a second strand with a sticky end. • Chemicals are released that mimic the sex pheromones of female moths. When a male moth approaches the spider uses its silk line as a lasso. Short ‐ necked oil beetle • Last seen in 1948; rediscovered this year in Devon, England • Produces highly toxic oil secretion when threatened • Adults live for three months, lay up to 1000 eggs that hatch the following spring ht p:/ news.bbc.co.uk/2/hi/uk_news/england/devon/6464531.stm 2 Short ‐ necked oil beetle • After hatching, the larvae crawl onto vegetation (often flowers) where they wait to hitch a ride on a mining bee on a mining bee. • The bee returns to its nest with the hitchhiker. • There the larvae devour the bee's eggs and its protein rich pollen stores. ht p:/ news.bbc.co.uk/2/hi/uk_news/england/devon/6464531.stm Lancet liver fluke ( Dicrocoelium dendriticum ) • The lancet liver fluke is a parasite that spends its adult stage in the liver of a host animal, usually a sheep or goat. Their eggs are deposited in the host’s feces • Their eggs are deposited in the host s feces. ht p:/ www.weichtiere.at/Mol usks/Schnecken/parasitismus/dicrocoelium.html Lancet liver fluke ( Dicrocoelium dendriticum ) • Snails eat the feces and are infected with the larval parasites. The larvae drill through the wall of the snail's gut and settle in its digestive tract tract....
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- Spring '10
- Pheromone, Fadeout time Locatability, Transmission rate Flow, Fairly easy High