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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 hosts 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