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Lecture 6

BIO205H5 Lecture Notes - Lecture 6: Negative Relationship, Semelparity And Iteroparity, Natural Experiment


Department
Biology
Course Code
BIO205H5
Professor
Christoph Richter
Lecture
6

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BIO205: Lecture #6: How Do Animals Deal with Limitations? 09/25/2014
Slide # 5: A Life History Is The Schedule Of An Organism’s Gwoth, Development, etc..
!Can measure growth at every stage.
!All traits are part of life history.
Slide #7: Where Do You Expect The Survival With High/Low Fecundity to fall?
!Clicker Question Where do you expect the survival of an animal with low fecundity to
fall?
o!Low fecundity, High survival of adult
o!Low fecundity,Low Adult survival
o!High fecundity, high survival
o!High Fecundity, low survival
!Clicker Question: Where do you expect the survival of an anmal with high fecundity to
fall?
o!Low fecundity, High survival of adult
o!Low fecundity ,Low Adult survival
o!High fecundity, high survival
o!High Fecundity, low survival
!Why don’t we see an animal with high fecundity and high survival?
Slide #8: The Principle of Allocation
!Cannot maximize all the factors of history
!Cannot maximize size, amount or shape of offsprings.
Slide #9: Plants Trade-off Offspring Size With Offspring
!Negative relationship :
o! producing lots of seeds but they are smaller
o!Producing bigger seeds but not a lot.
!This was a natural experiment
o!Measure # and amount of offspring
o!Nothing was manipulated
Slide # 10: Animals Trade off number of offspring and survival
!Nests that had removed had higher survival probability because they had fewer chicks to
lok after, less predator affect.
Slide #11: Yucca Plants Have Different Strategies
!Yucca plants some can be Iteroparus and some can be semelparous
!Both exists and in stable populations so then what is the difference between them?
o!Semelparous hs a large amount of water but there is frequent fire.
o!Iteroparus has a small amount of water but fires occurring is a small probability.
Slide #
!Through hunting we added a pressure that changed 2 life history traits.
!
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