Lab 8

Topics: Population growth, Demography, World population Pages: 5 (1110 words) Published: August 17, 2015
ESCI 1102
Lab 8
Population Change

Directions: Listed below are this Learning Module lab questions to answer. When completed, upload this file back to the Lab dropbox (where you downloaded in the first place). FYI: I really like it when the answers are in a different format/color than the questions. It helps when grading.

Part 1. Population Biology is an online virtual lab that will illustrate how competition affects population growth. Follow the instructions given. Two species of unicellular organisms are used to determine patterns of population growth. Run the program to determine the growth pattern of each species.

a.Make a hypothesis about how you think the two species of Paramecium will grow separately. Then run the experiment.
When the two species of Paramecium are separate both will survive as the days pass.

b.Keep track of your findings and then create graphs of your data using the provided tools. Take a screen shot of your graph, save as an image file, and upload for grading. You will have a screen shot for each paramecium grown alone for a total of 2 screen shots. Paste them below.

c.On what day did the Paramecium caudatum population reach the carrying capacity of the environment when it was grown alone? How do you know?

Day 8 because the days after the same number was repeated.

d.On what day did the Paramecium aurelia population reach the carrying capacity of the environment? How do you know?

Day 14 because the day after, the same number was repeated.

e. Was your hypothesis correct? Why or why not?

Yes, because as the days passed both Parameciums increased as the days passed. I did not see any decrease on both.

f.Make a hypothesis about how you think the two species of Paramecium will grow when mixed together in the same test tube.

I think when they are together only one will survive as the days pass.

g.Run the experiment with the two species combined. Create a graph of this portion of the experiment. Take a screenshot of your graph. Describe the differences in the population growth patterns of the two Paramecium species. What does this tell you about how Paramecium aurelia uses available resources?

In the P. caudatum population they use a larger amount of the available resources and that’s why there are a smaller amount of the species, and with the P. auralia a smaller amount of resources is used by each individual and that is why there are many more of the P. auralia specie.

h.Do the results support the principle of competitive exclusion? Why or why not?

The competitive exclusion principle states that two species competing for the same resources cannot coexist if other ecological factors are constant. Since P. aurelia had the advantage that specie survived and therefore the P. caudatum died off.

i.Explain how this experiment demonstrates that no two species can occupy the same niche.

This experiment demonstrates that no two species can occupy the same niche because when the two species were put together one died off.

Part 2. Worldwide Human Population Growth. In this portion of the lab, we'll see if human population growth shows the same growth rate as that in Part 1. Use the provided Excel graph to answer the questions below.

a.It took 1649 years for the world population to double, going from .25 billion people to .50 billion people. How long did it take for the population to double again, going from .50 billion people to 1 billion people? What year did the population reach 1 billion?

It took 200 years for the population to double again, it doubled between 1650 and 1850. On year 1850 the population reached 1 billion.

b.When did the population to double for a second time (1 billion to 2 billion people)? How many years did it take? When/How long did it take for the population to double for a third time (2 billion to 3 billion people)?

The population doubled for the second time in 1925, it took 75...
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