Bio122 Fall2015
Activity 5: Populations - Life Tables
Name ________________________________________________________________
1. Write the equation to calculate each of the following (use the life table below to help you)
lx, survivorship=probability at birth of surviving to a given age =
Sx, survival rate= chance that an individual of age x will survive to next age class=
Fx, fecundity= avg # offspring produced by a female in age x=
2. Dr Joseph Connell (UCSB) studied the barnacle Balanas glandula and published life table data for this
species in 1970. Using this table below, calculate the missing values for lx, Sx, and Fx
* Noffx = Total Number of Offspring
3. Plot the survivorship curve for this species (skip age 0) in the graph below. Be sure to label each axis.
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Bio122 Fall2015
Activity 5: Populations - Life Tables
4. What type of survivorship curve does this barnacle population have? Describe the pattern.
5. Use the following table to project the size of a population
a. Fill in the last 2 columns
Year 1
Year 2
Age
Nx
Sx
lx
Fx
0
50
.33
1
0
1
50
.5
.33
3
2
50
0
.167
2
3
0
0
0
N surviving
to next time
period
# newborns
from each
age class
b. What is the total population size at 1st time interval? _____________
c. What is the total population size at the 2nd time interval?_____________
d. Calculate the finite multiplication rate λ = N(t+1)/N(t) =
e. Is this population growing, stable, or decreasing?
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