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Lecture 5

BIO318Y5 Lecture Notes - Lecture 5: Parasitic Disease, Parasitoid, Electronic Assessment

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Sanja Hinic- Frlog

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BIO318 Lecture 5
- Suicidal crickets
- Last lecture
oFitness of both males and females are on different levels
- Behavioural and other adaptations in different populations can lead to population
divergence even in sympatric populations
- Given the social biology of cuckoos, however, sympatric speciation is unlikely
- Don’t memorize every term in the textbooks except the ones we use a lot in class
- Two definitions
oAdaptation: a trait that increases the fitness of it’s bearer and that evolved for that
specific role (versus effect)
oAdaptive phenotype: occasionally extends beyond the organism – concept of the
extended phenotype
Goes beyond organism
Ex. Spider making webs as an extended arm to catch and to run away
- Fox poles whiteness is an adaption to running; poles did not evolve to deal with snow;
example of fitness enhancing effect
- Parasites manipulating hosts
oHypothesis testing and the culture of science
oSelf correcting and self critical
o“sexy science”
oParasite manipulating hosts and using as their own phenotype
Worm came out of it
- Horse hair worm taking host
- Crickets and their ally, they have to host some parasite worm
- The worms were somehow manipulating crickets to go to water; male worm will find
female worms in the pond and then lay eggs in the pond, then the aquatic insect eats the
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