BIO205 Lecture 7
- Nature walk with Dr. Kotanen
- Lecture 7: Trade-offs in life history
- Don’t lose the facts for the figures
o How does a single squirrel affect the numbers?
o How many offspring a squirrel gave birth
o Mortality rates
- Life tables reflect life history characteristics such as...
o Growth rate
o Age of first reproduction
o Number of offspring
- Consider the options
o Huge amount of variability
o iClicker question: the organisms reproduces shortly after birth and continues to
reproduce every year, giving birth to numerous, large offspring
Is this realistic? Yes or no?
Young parent can’t give birth to large offspring
Experience to pass on to your offspring to increase survival
More resources accumulated when the organism is older
- How are survival and fecundity related?
o Increasing curve from left to right
o Higher fecundity costs parents years of their lives
o The curve usually looks like a downward curve from left to right
o IMAGE REMOVED
- Animals have to behave strategically
o Limitations are imposed by
Biotic and abiotic environment
o Each action has associated benefits and costs
o Each strategy involves trade-offs
- We can study such trade-