CH 19 Vocabulary & Concepts: Understanding Populations

population -

birth rate -

death rate -

age structure -

immigration -

emigration -

limiting factor -

exponential model -

logistic model -

carrying capacity -

density-dependent factors -

density-indepnedent factors

1) Please combine the factors of # of births, # of deaths, # of immigrants, and # emigrants to produce a formula for population growth.

2) Estimation of population size by Capture, Mark, & Recapture. Get a cup and fill it with beans. How many beans would you guess are in the cup?_____

(Capture) Shake out 15-30 beans. How many did you "capture" from the "population?" A_____ Mark them with a marker.

(Release) "Release" the marked beans back into the "population." Mix them up thoroughly.

(Recapture) Randomly shake out 15-30 beans. How many are marked? B______ How many are not marked? C_____

Use the following formula to estimate population size (X): B / C = A / X therefore X = (A x C) / B

population estimate (X) = ________

Count the actual population (P):_________

What percent were you off from actual? ( | P - X | / P) * 100 = ______

How did you compare to other groups in the class?

What are the limitations of this technique for estimating population growth?

Could it ever be useful? Explain why or why not.

3) Draw the different population age structures given by your teacher. Explain the importance of a population’s age structure.

4) Draw and describe the exponential model of population growth. Draw the logistic model of population growth. How are they the same? How are they different?

5) List reasons why small populations are more vulnerable to extinction.