1. Which of the following risks is the result of random variation in the survival and production of offspring and is especially of concern for a small population?
A. Genetic drift
B. Environmental stochasticity
C. Inbreeding depression
D. Demographic stochasticity
2. Imagine you are a marine biologist and you want to estimate the population size of sea otters in your study area. Which of the following method would be the best approach to do this?
A. Counts
B. Mark-recapture
C. Quadrat
D. All of the above
3. You captured and tagged 15 otters on Day 1. A month later, you resample the area and catch 30 otters, of which 3 are tagged. What is the estimated total population size?
A. 30
B. 50
C. 125
D. 150
E. 450
4. If you used a mark-recapture approach to estimate the size of an animal population, but the tags were defective and fell off some of the originally sampled individuals, the method would tend to:
A. Underestimate the true population size
B. Overestimate the true population size
C. Either underestimate or overestimate the true population size, depending on how many individuals lost their tags
D. None of the above
5. Which of the following affect population size?
A. Birth, death
B. Birth, death, immigration, emigration
C. Birth, death, immigration, emigration, speciation
D. Birth, death, genetic drift
E. None of the above
