lab report

Lab 2: Populations: Survivorship, Distribution, and Population Growth

Lab 2 Procedures
It is highly recommended that you print this document for ease of access while completing the activities.

Use this spreadsheet to generate graphs and other data as you complete the activities described in the Lab procedures.

Lab 2 Report
Analyze data and answer analysis questions. Submit this document when completed.

Lab 2 Report: Survivorship, Distribution, and Population Growth
Record your answers to the corresponding questions as you complete the lab as described in the Lab Procedures. To fill in your answers to each question, click directly below the question and begin typing. When completed, submit this document through the assignment submission page on the Moodle course website.
Part 1: Human Survivorship
Table 1: Human Survivorship Table-Sample Size of 5
Complete the table as described in the lab procedures.
Year
Died
Year
Born
Age at Death
AI
0-10
AI
11-20
AI
21-30
AI
31-40
AI
41-50
AI
51-60
AI
61-70
AI
71-80
AI
81-90
AI
>91

%   of Lifespan

10

20

30

40

50

60

70

80

90

100

Totals
Graph 1: Human Survivorship, Sample Size of 5
Click directly below this text and insert your graph image:
Graph 2: Human Survivorship, Sample Size of 25
Click directly below this text and insert your graph image:
Graph Analysis

Compare and contrast the similarities and differences you observe between the two graphs. Address average length of life, curve of each graph, youngest and oldest age at death, etc. Hypothesize on whether you think this is a representative curve for people in the United States? (Think back to the Population Bureau data!)

What type of survivorship curve does each population appear to demonstrate? Keep in mind that once all the people are dead, the curve ends. A flat line on the X axis should not be considered part of your curve.

Discuss some major events in human history that can explain the differences in the different human survivorship curves throughout history. Be sure to incorporate terminology presented in the learning materials this week. (i.e. density dependent factors, growth rate, early/late/constant loss, etc).

Data Analysis
Answer the following questions, using your sample size of 25. (Be careful in your responses here! Pay close attention to data reported in the graph (percent of survivors) vs. what the questions below are asking for (percent of dead!)

What is the youngest age of death in your data set?

The oldest age at death?

At what age has 25% of your sample population died?

50% died?

75% died?

Part 2: Feather Survivorship
Table 2: Feather Survivorship Data
Feather Number
(Control)
Time
to Death
Feather Number
(Parental)
Time
to Death
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
Graph 3: Feather Survivorship
Click directly below this text and insert your graph image:
Feather Survivorship Analysis

For each of your graphs, identify the type of survivorship each illustrate. While they may appear similar, look closely for subtle differences. Provide an example of an animal that might also have a similar survivorship curve. Keep in mind that once all the feathers are dead, the curve ends. A flat line on the X axis should not be considered part of your curve.

Describe the differences and similarities you observe between the two graphs that are generated different. Do you feel that your graphs demonstrate an advantage to providing parental care? (Be descriptive as possible, using appropriate terminology).

Part 3: Distribution Patterns
Table 3: Coin Flip Data
Coin Flip
Number of Algae Touched
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
9
20
Table 4: Index of Dispersion
Target Species per Plot
(X)
Number of plots
(E)
Number of Algae Counted
0
1
2
3
4
5
6
7
Totals
(n) =
(N) =
Index of Dispersion (Id)
Part 4: Population Growth Activity
Be sure to show your calculations in this section! You may choose to use pencil and paper to calculate, just be sure to indicate how you arrived at the numbers you report. If you do not supply your calculations you instructor may not be able to provide you meaningful feedback on incorrect answers and you risk losing credit for this section!
Table 5: Tide Pool Population Counts
Species
Algae
Young Urchins
Population Count
Density and Distribution of Algae

Calculate the density of the algae. Be sure to show your calculations and use appropriate units. Hint: We discussed density in the lecture slideshow about population demographics!)

Based on the index of dispersion you generated in Part 3, what pattern best describes the algae?

What might this pattern tell us about the lifestyle of the algae and the habitat that they live in?

Sea Urchin Population

What is the sea urchin population size at the beginning of 2015?

What is the sea urchin population size at the end of 2015?

What is the birth rate?

What is the death rate?

What is the growth rate?

Urchin Population Growth
Using the population growth equation presented in lecture, calculate the predicted population size of the urchins over the course of 6 years. Round your population sizes at the end of each year to the nearest whole number.
**Hint! Does your population size reported below at the end of 2015 match up to the population size you calculated in #2 above? If not, you did something wrong!**
End of Year:
Population Size
2015
2016
2017
2018
2019
2020
Is this population growth likely?  Why? (Keep in mind that an adult sea urchin is approximately the size of a softball, and 100 square meters is approximately the size of a two bedroom apartment.)

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