Purpose: You will be expected to estimate the size of a sample population using the mark-recapture technique. Be able to apply the technique to new population problems and compare the mark and recapture technique to other methods of population estimating.
Background: Sampling is used to estimate population size. The organisms in a few small areas are counter and projected to the entire area. Another method in determining populations of a variety of species biologists use is called tagging. Sometime the tags are stricker (in the case of butterflies), ear clips, or notches made in fins of fish. Biologists will release the animals and allow to naturally redistribute themselves. Taking random samples and determining the %tagged.
Procedure:
1. Obtain a bowl with your "species" in it. (Fish crackers)
2. Do not count the % of fish in your pond yet!
3. Have 1 member of your group remove a large handful of fish. Write that number here: 16
4. Count the number of fish you just removed and replace these fish with "tagged" fish (in this case, colored fish)
5. Mix your pond well to redistribute the tagged fish among the other fish.
6. One member at a time (and without looking), remove a handful of fish and record the number of total fish in the sample, the number of tagged fish, and figure out the percentage of tagged fish.
7. Return your handful to the bowl!! Continue with this until you have taken 20 samples.
Data:
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20
Total
Fish 18 12. 12. 14. 19. 15. 17. 18. 9. 16. 9. 10. 9. 9. 7. 10. 11. 10. 12. 18
Tagged
Fish. 2. 5. 3. 3. 4. 1. 4. 3. 1. 5. 0. 2. 0. 2. 6. 2. 3. 3. 3. 1
%. 11. 42. 25. 21. 21. 7. 24. 17. 11. 31. 0 20. 0. 22. 35. 20. 27. 30. 25. 6
Tagged
Mean: 13.25
2.65
25.19
1. What is the mean (average) of your % tagged fish from your 20 samples?
23%
2. Population size= total number captured * number marked
Total number captured with mark
69 fish
3. Now, actually count the number of fish in your bowl: 91 fish
4. Find your percentage error by using the following formula: -24%
5. What concerns should a biologist have about a species habits before the uses this method to approximate the size of a population?
Immigration, emigration, seasonal, amount of resource.
Conclusion: how did you fulfill the purpose? What did you learn?
I fulfill the purpose by estimating the size of sample population using the mark recapture technique. The things I learn from this lad is sampling and tagging are 2 method that use to estimate the size of population.
Background: Sampling is used to estimate population size. The organisms in a few small areas are counter and projected to the entire area. Another method in determining populations of a variety of species biologists use is called tagging. Sometime the tags are stricker (in the case of butterflies), ear clips, or notches made in fins of fish. Biologists will release the animals and allow to naturally redistribute themselves. Taking random samples and determining the %tagged.
Procedure:
1. Obtain a bowl with your "species" in it. (Fish crackers)
2. Do not count the % of fish in your pond yet!
3. Have 1 member of your group remove a large handful of fish. Write that number here: 16
4. Count the number of fish you just removed and replace these fish with "tagged" fish (in this case, colored fish)
5. Mix your pond well to redistribute the tagged fish among the other fish.
6. One member at a time (and without looking), remove a handful of fish and record the number of total fish in the sample, the number of tagged fish, and figure out the percentage of tagged fish.
7. Return your handful to the bowl!! Continue with this until you have taken 20 samples.
Data:
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20
Total
Fish 18 12. 12. 14. 19. 15. 17. 18. 9. 16. 9. 10. 9. 9. 7. 10. 11. 10. 12. 18
Tagged
Fish. 2. 5. 3. 3. 4. 1. 4. 3. 1. 5. 0. 2. 0. 2. 6. 2. 3. 3. 3. 1
%. 11. 42. 25. 21. 21. 7. 24. 17. 11. 31. 0 20. 0. 22. 35. 20. 27. 30. 25. 6
Tagged
Mean: 13.25
2.65
25.19
1. What is the mean (average) of your % tagged fish from your 20 samples?
23%
2. Population size= total number captured * number marked
Total number captured with mark
69 fish
3. Now, actually count the number of fish in your bowl: 91 fish
4. Find your percentage error by using the following formula: -24%
5. What concerns should a biologist have about a species habits before the uses this method to approximate the size of a population?
Immigration, emigration, seasonal, amount of resource.
Conclusion: how did you fulfill the purpose? What did you learn?
I fulfill the purpose by estimating the size of sample population using the mark recapture technique. The things I learn from this lad is sampling and tagging are 2 method that use to estimate the size of population.