Pre-lab Oaklawn

Pre-lab Oaklawn - Changes in lifestyles (ie, poor diet,...

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Principles of Ecology Lab 5: Pre-lab Exercise: Demography at Oaklawn Cemetery 1) What is demography? Study of statistics that affect population size (ie, birth rate, death rate, emigration rate, immigration) 2) What types of life histories do the three survivorship curves represent? Give an example of an organism associated with each type of curve. Type I: low death rates until individuals age. Ex: Most mammals Type II: constant death rate throughout life of organism. Ex: post-fledgling birds Type III: relatively high death rate initially that abates later. Ex: Comb oyster, oak tree 3) What factors (other than disease and work-related accidents) impact human survivorship today differently than they did many years ago?
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Unformatted text preview: Changes in lifestyles (ie, poor diet, lack of exercise, drug abuse, use of automobiles) Also larger population=less resources (ex: children in Africa) 4) Formulate hypotheses about 1) what type of survivorship curve (I, II, or III) your assigned cohort will exhibit, 2) how male and female survivorship curves will differ for your cohort, 3) how the survivorship curves of the six cohorts will differ. 1) Cohort will exhibit Type I survivorship curve. 2) Males will probably exhibit earlier deaths than the women will, thus the curve will be steeper. 3) I think the survivorship curves will all be Type I among the six cohorts, however the steepness of the curve will lessen in later years....
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