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Lecture 4

BIO318 Lecture 4 (Sept 18).docx

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University of Toronto Mississauga
Sanja Hinic- Frlog

BIO318 Lecture 4 - What does a cuckoo bird do? o o Beg from worker ants o Kleptoparasitism o Take from other nests or drop their eggs into other nests o The brutal hatchlings of the cuckoos and push out other hatchlings  Fed by the host bird o Some ducks also act as cuckoos amongst their own species o In Canada, cowbird is like a cuckoo - The biological environment: case study – the cuckoo o Linking natural selection to diversification - The eggs of hosts and cuckoos o Cuckoo eggs mimic host eggs o Other than Dunnock  Useless in distinguishing cuckoo and model eggs from its own eggs  Poorly discriminates cuckoo eggs and as a result suffers o Host race o Cuckoo specialize on a particular host and develop an egg that matches the host o Diversity amongst a species; polymorphism - What do you expect about the discriminating ability of different hosts? - Why are dunnocks hopeless discriminators?
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