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# 1.2 Studying Populations

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### 1.2 Studying Populations

1. 1. <ul>Studying Populations </ul><ul>Mr. Schumaier </ul>
2. 2. What is POPULATION DENSITY? <ul>1 </ul>
3. 3. The number of individuals in an area <ul>1 </ul>
4. 4. How do ecologists determine the size of a population? <ul>2 </ul>
5. 5. <ul>2 </ul>Direct Observations Counting one by one all members of a species in an area.
6. 6. <ul>2 </ul>Indirect Observations Observing tracks or other signs rather than the organisms themselves.
7. 7. <ul>2 </ul>Sampling Ecologists make an estimate. Count the number in a small area then multiply to find for a larger area
8. 8. <ul>2 </ul>Mark-and-Recapture Animal is captured, marked, and then released into the environment. They are then recaptured and counted.
9. 9. What is an ESTIMATE? <ul>3 </ul>
10. 10. An approximation of a number, based on reasonable assumptions. <ul>3 </ul>
11. 11. When is sampling used to estimate a population? <ul>4 </ul>
12. 12. Sampling is used when it is not possible to count every member of a population because there are too many, they are too spread out, or not all the members of the population can be found. <ul>4 </ul>
13. 13. What causes populations to change in size? <ul>5 </ul>
14. 14. New members enter the population or members leave the population. <ul>5 </ul>
15. 15. What do scientists mean by BIRTH RATE & DEATH RATE? <ul>6 </ul>
16. 16. Birth Rate Number of births in a population in a certain amount of time. <ul>6 </ul>Death Rate Number of deaths in a population in a certain amount of time.
17. 17. What is IMMIGEATION? <ul>7 </ul>
18. 18. Moving into a population. <ul>7 </ul>
19. 19. What is EMIGRATION? <ul>8 </ul>
20. 20. Leaving a population <ul>8 </ul>
21. 21. What is a LIMITING FACTOR? <ul>9 </ul>
22. 22. An environmental factor that prevents a population from increasing. <ul>9 </ul>
23. 23. What factors limit population growth? <ul>10 </ul>
24. 24. Food Space Weather Conditions <ul>10 </ul>
25. 26. What is an environments CARRYING CAPACITY? <ul>11 </ul>
26. 27. The largest population that an environment can support. <ul>11 </ul>
27. 30. How can space & weather limit population growth? <ul>12 </ul>
28. 31. Space – If organisms are crowded, some will not be ale to reproduce or even survive. <ul>12 </ul>Weather – Severe weather conditions can kill many members of the population.
29. 32. <ul>The End </ul>