 # BSC 108 Lab 12 Ecology Lab and Journal Worksheet (Alabama)

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BSC 108 Lab 12 Ecology Lab and Journal Worksheet (Alabama)

Ecology Lab

Instructions: Answer the questions below, based on the three experiments you complete for this lab.

Part 1 – Estimating Population Size – Mark

Part 2 – Estimating Population Size – Recapture

Part 3 – Effect of Predator Introduction

Ecology Journal

Part 1 – Estimating Population Size – Mark

1. What are the three assumptions of the mark and recapture estimate?

2. Based on the assumptions described in the Background of the Lab Manual, why might the mark and recapture method of population estimation be more accurate in a lake than in a stream or river?

3. What are some characteristics of the collecting locations that might make the samples collected from each location distinct from the others?

Part 2 – Estimating Population Size – Recapture

4. Is there a significant difference (more than 5 cm) between this average length and the average length from Part 1? If so, what could account for the variability?

5. Is there a significant difference (more than 20 grams) between this average mass and the average mass from Part 1? If so, what could account for that variability?

6. How many bluegill fish are in the lake? Calculate your population estimate (N) using the equation: N = MC/R

Part 3 – Effect of Predator Introduction

7. Why is it important to wait a year before performing the second population estimate?

8. Is there a significant difference (more than 10 cm) between the average length in Part 3 and the averages from before introduction of the bass (Parts 1 & 2)? If so, why might predation shift the average up or down?

9. Is there a significant difference (more than 10 grams) between the average mass in Part 3 and the average masses from before the introduction of the bass? If so, why might predation shift the average up or down?

10. How many bluegill fish are in the lake after the predator bass fish were introduced? Calculate your population estimate (N) using the equation:N = MC/R

11. How does your population estimate compare to the one from Part 2? Was the hypothesis in the Background correct? Why or why not?

12. Wha