Rio Salado Community College Population Growth Discussion

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Lab 12 Worksheet Compose answers to the questions below and save the file as a backup copy in the event that a technical problem is encountered while attempting to submit the assignment. Make sure to run a spell check. You will be submitting your answers to the lab assignment in two parts. The first part of the lab assignment consists of the laboratory exercise questions. The second part of the lab assignment is the application question. The first textbox on the submission page corresponds to the first part of the lab. Be sure to paste the laboratory exercise questions, with your answers, into this textbox. The second textbox on the submission page will be for your response to the application question. LABORATORY EXERCISE QUESTIONS ~~1. Answer the following turtle population questions: a. Using random sampling technique, select 3 grid segments for a sample taken from the plot above. List the 3 grid segments you selected. (1 point) b. Based on your sample, what is the average number of turtles per grid segment? (1 point) c. The plot represents an entire beach and each dot represents a turtle. Calculate the estimated turtle population on the entire beach based on the 3 random grid segments in your sample. (1 point) d. Count the total number of turtles on the beach. List that total. From this actu al count, what is the average number of turtles per grid segment? Show your work. (1 point) ~~2. Briefly explain why biologists use sampling, rather than individually counting all members of the population of interest. (5 points) ~~3. a. When using the random sampling estimation technique, which type of dispersion is most effectively estimated? In other words, which population distribution pattern will yield the most accurate population size estimate when the random sampling procedure is followed? (2 points) b. Briefly explain why this would be the case. (4 points) ~~4. In a forest that measures 5 km by 5 km, a sample was taken to count the number of silver maple trees. The number of trees counted in the grid is shown below. The grids where the survey was taken were chosen randomly. Determine how many silver maple trees are in this forest using the random sampling technique. Show your work. (5 points) Lab 12 Worksheet 9 5 8 14 9 ~~5. Refer to the diagram below of two plots that are 2 m x 2 m samples from two different 1000 square meter fields (Field 1 and Field 2) to answer the following questions: a. Which location has the higher population density of weeds? (1 point) b. Each plot is a 2 m x 2 m sample from two different fields, and each field covers a total of 1000 square meters. How many weeds are found in each field? Explain how you were able to determine your results. (4 points) ~~6. What are five specific examples of limiting factors that could control the population density of a weed population? (5 points) ~~7. A 5 km x 5 km plot has a weed count of 250 weeds. What would the population density be? What would the population density be for the exact same plot six months later with a count of 200 weeds? Show your work. (5 points) ~~8. A Conservation Biologist with the Arizona Game & Fish Department has been tasked with estimating the population size of elk in the Kaibab National Forest. Given the information presented in Lab 12, what method might she use to determine approximately how many elk are present? What might be a possible disadvantage to using this method to estimate animal population sizes? (5 points) ~~9. From the yeast count activity, predict approximately what the populatio n count for yeast would be at 200 hours. Provide an explanation for the population count prediction (e.g. How did you arrive at this prediction?). (5 points) ~~10. What is the name of the type of growth the yeast exhibited in the provided Lab 12 yeast population data (Procedure Part C)? (5 points) ~~11. Is yeast an r-selected or K-selected species? Based on the type of selection for yeast, list four factors they exhibit. (5 points) Lab 12 Worksheet ~~12. List five specific limiting factors that likely influenced the population growth of th e yeast in the container. Make sure to include factors with a negative and positive influence, if applicable. (5 points) a. b. c. d. e. ~~13. Imagine that on day three, half of the yeast population was removed from the container and placed in a second container. An additional 2 grams of sugar were added to each container. Describe what the expected growth rate would be for each container. (5 points) ~~14. Describe the general relationship between population growth and resource availability? (5 points) ~~15. Give two examples of density-independent limiting factors. (4 points) a. b. ~~16. As of this year alone, there have been 301 births and 102 deaths in a population of 1000 giraffes. The number of giraffes who have joined this population are 28 individuals and the number who have left total 39 individuals. What is the growth rate (as a percentage) of this giraffe population? (6 points) APPLICATION QUESTION ~~17. (Application): How might the information gained from this lab pertaining to Population Ecology be useful to you, or how can you apply this knowledge to your everyday life as a non scientist? The application will be graded according to the rubric below. (20 points)
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Explanation & Answer

Attached.

Running Head: POPULATION GROWTH

1

Answers to a Lab Experiment on Population

Name

Institution

POPULATION GROWTH

2

Compose answers to the questions below and save the file as a backup copy in the event
that a technical problem is encountered while attempting to submit the assignment. Make
sure to run a spell check.

You will be submitting your answers to the lab assignment in two parts. The first part of
the lab assignment consists of the laboratory exercise questions. The second part of the
lab assignment is the application question. The first textbox on the submission page
corresponds to the first part of the lab. Be sure to paste the laboratory exercise questions,
with your answers, into this textbox. The second textbox on the submission page will be
for your response to the application question.

LABORATORY EXERCISE QUESTIONS

~~1.

Answer the following turtle population questions:

POPULATION GROWTH

3

a. Using random sampling technique, select 3 grid segments for a sample taken
from the plot above. List the 3 grid segments you selected. (1 point)


Grid A1



Grid A2



Grid B2

b. Based on your sample, what is the average number of turtles per grid segment?
(1 point)


For Grid A1 there are 4.5 turtles



For Grid A2 there are 4 turtles



For Grid B2 there are 4 turtles

c. The plot represents an entire beach and each dot represents a turtle. Calculate
the estimated turtle population on the entire beach based on the 3 random grid
segments in your sample. (1 point)


Based on Grid A1 the total number of turtles is 4.5 x 6 = 27 turtles



Based on Grid A2, the total number of tattles is 4 x 6 = 24 turtles



Based on Grid B2, the total number of turtles is 4 x 6 = 24 turtles

POPULATION GROWTH

4

d. Count the total number of turtles on the beach. List that total. From this actual
count, what is the average number of turtles per grid segment? Show your
work. (1 point)

➢ The total number of turtles is 28
➢ Based on this total, the number of turtles per segment = 28 / 6 =
4.6667 turtles.

~~2.

Briefly explain why biologists use sampling, rather than individually counting all

members of the population of interest. (5 points)

There are a number of good reasons why sampling is preferred rather than counting
the entire population. Some of these reasons are;...


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