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Lecture 7

BIO205 Lecture 7 (Oct 1, 2012) - EDIT.docx

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University of Toronto Mississauga
Christoph Richter

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 o Longevity - 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  Unlimited resources? 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  Physiology  Energetic o Each action has associated benefits and costs o Each strategy involves trade-offs - We can study such trade-
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