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Jun 13, 2024

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SBI4U – Gr. 12 Biology Univ. Prep. Unit 5: Population Dynamics Name: _____________________________________ Characteristics of Populations Read textbook section & answer the following questions. Definitions Define the following terms. 1. Habitat: 2. Species: 3. Population size: 4. Population density: Population Size & Density 5. What is the equation used to calculate population density? Label the terms. 6. If there are 400 moose living in a 600ha region of Algonquin Park, what is the population density? 7. What is the difference between crude density and ecological density ?
SBI4U – Gr. 12 Biology Univ. Prep. 8. What density is represented in question #6 – crude density or ecological density? Why? 9. Redo question #6, this time accounting for a 70ha lake in the habitat. What type of density accounts for this? 10. What is population dispersion? 11. What are the 3 patterns of population dispersion? Draw a picture & give an example of an animal for each. Measuring Population Characteristics Populations are “dynamic” – they keep changing! Thus, it is hard to count numbers of animals in a population. Researchers count numbers at a specific time & estimate/predict population numbers based on these numbers. 12. Describe quadrat sampling. What type of species is this type of sampling good for?
SBI4U – Gr. 12 Biology Univ. Prep. 13. You want to estimate the number of ragweed plants growing in a large field, 100m x 100m. You place a quadrat (3.0m x 2.0m x 2.0m) down on the field in 3 different spots and count the number of plants in each quadrat. Your results are 18, 11 and 24 plants. a. What is the population density of ragweed in the field? b. What is the population size of ragweed in the field? 14. Describe the “mark - recapture” method. What types of species is this method good for? 15. What are the criteria for the marking techniques used? 16. What assumptions are made when using this method? 17. What is the equation used in this method? Label the terms. 18. Wildlife researchers capture 80 wood ducks & mark them. 2 weeks later, they capture 100 ducks & find that 12 were marked. What is the population size of wood ducks in that area?
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