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Lecture 13

BIO318 Lecture 13 (Oct 23).docx

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University of Toronto Mississauga
Sanja Hinic- Frlog

BIO318 Lecture 13 - Murmuration phenomena o A collection of starlings in action is called murmuration - Update on cuckoo mimicry o Pattern on the eggs o Local adaptation to the chest feather o Cuckoos impersonate hawks by matching their outfits - Batesian mimicry o Harmless species that mimics other stinging insects o Has furry yellow and black abdomen - Last lecture : o Episodes of sexual selection after copulation  The concept of fitness o Direct competition between ejaculates of different males o “cryptic” female choice (potential for females to control the relative reproductive success of her mates: from manipulation of ejaculates/fertilization through to “differential allocation” of resources to zygotes and offspring) o Some post copulatory sexual conflict likely (e.g. male chemical influences on remating/oviposition)  Spiking the sperm so that it affects female mating (ex. Make the female lay more eggs or make her reject other males)  Hormonal control on the female - Comb jelly? o Marine animal o More than one sperm enters the membrane o Female pronucleus moving towards one male and then heading back to another male o Cryptic female choice right at fertilization - Courtship a (biological) definition? o Any mechanisms that affect mating choice all the way to the beginning of fertilization - “secondary sexual character” (list from dragonfly video) o Brushes on male penis; removing rival sperm  Sexually selected character/secondary characteristics  Before, it was only regarded as the penis as the primary characteristic - Unselfishness in nature o More adaptive suicide o Why? o Worker sacrifice: one special difficulty, which at first appeared to me insuperable, and actually fatal to my theory (Charles Darwin)  The sting stays embedded in the victim and then the sting also rips out the internal organs of the bee and then they die  Darwin thought he had the explanation; he was group selectionist o Actually very individual selectionist - Group phenomenon are amazing in nature - Need to understand cooperation a
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