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BIOL 1902 (382)
Lecture

wk 12.doc

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Department
Biology
Course
BIOL 1902
Professor
Michael Runtz
Semester
Fall

Description
SOME NOTES FOR WEEK 12 OLFACTORY CHEMICALADVERTIZEMENTS PHEROMONESSEXUAL PERFUMES PLEASE NOTE THAT THERE ARE OTHER TYPESWASPS HAVE DEFENSIVEATTACK PHEROMONESMAMMALS ALSO HAVE TERRITORIAL PHEROMONESMAMMALS HAVE SEXUAL PHEROMONE GLANDS NEAR GENITALS OFTEN RELEASE PHEROMONES IN URINE PHEROMONES INFORM POTENTIAL MATE THAT SENDER IS READY FOR BREEDING CAN ALSO SERVE TO STIMULATE FEMALE TO OVULATION HARES PORCUPINES SNAKES MOOSE DEER USE PHEROMONES IN COURTSHIP INSECTS USES IS WELL DEVELOPED IN MOTHS ESPECIALLY SILK MOTHS MALES HUGE ANTENNAEMORE THAN FOUR MILLION PORES JUST TO CAPTURE FEMALES PHEROMONES MALES CAN DETECT FROM SEVERAL KILOMETERS AWAY AND TRACK FEMALES DOWNPHEROMONES OFFER ADVANTAGES1 THEY ARE SPECIES SPECIFICCODED MESSAGES2 THEY ARE LONG RANGE 3 THEY ARE PERSISTINGSOME ANIMALS OFFER NUPTIAL OR COURTSHIP GIFTSCOURTSHIP GIFT GIVINGMOST COMMON IN SMALL PREDATORY ANIMALSEXAMPLES SOME SPIDERS DANCE FLIES SCORPIONFLIESREAL RISK FACED BY AMOROUS MALESMAY BE MISTAKEN FOR FOOD MALES GIVE FEMALE A GIFT OF FOODKEEPS HER OCCUPIED GIFTS CAN ENTICE A FEMALE TO ACCEPT A MATE AND TO KEEP THE SUITOR ALIVEOTHER WAYS OF AVOIDING BEING A MEAL DURING COURTSHIPMALE ORBWEAVER SPIDERS ARE OFTEN MINISCULE TINY COMPARED TO THE FEMALE THEY MAY ALSO PLUCK THE FEMALES WEB WITH A SPECIAL NUPTIAL RHYTHM TO ENSURE THEY ARE NOT MISTAKEN FOR FOODATTEMPTS TO GUARANTEE PATERNITY OF OFFSPRING 1 REMOVE COMPETITORS SPERM AND REPLACE IT WITH YOUR OWN EXAMPLEEBONY JEWELWING DAMSELFLY PENIS HAS SCOOPS TO PULL OUT OTHER MALES SPERM 2 STAY WITH FEMALE UNTIL NO LONGER MATES OR EGGS ARE LAIDCONTACT GUARDINGEXAMPLESBULL MOOSESOME DRAGONFLIES DO KEEP CLASPERS ATTACHED TO FEMALES HEAD WHILE SHE LAYS HER EGGS OR SOME DRAGONFLY MALES FLY IN CIRCLES AROUND THE FEMALE WHILE SHE LAYS HER EGGS3 HAVE VERY LONG COPULATIONSWOLVES STUCK TOGETHER FOR MORE THAN ONE HOUR MARCH FLIES56 HOURS
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