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- 6. What is the difference between exponential growth in a population (1-shaped curve) and logistic growth (S-shaped curve)?10. Effective population size refers to the number of individuals which can participate in the reproduction process. Which of the following proportions of individuals would bring about the highest effective population size? 20 females and 80 males 70 females and 30 males 45 females and 55 males 35 females and 65 males11. To measure the population of monarch butterflies occupying a particular park, 10 butterflies were captured, marked with a small dot on a wing, and then released. The next day, another 50 butterflies are captured, including the recapture of 5 marked butterflies. What will be the estimated population size?
- 1. Hunting is one way of reducing population size. Wildlife managers closely watch changes in population numbers of all wildlife species in order to determine legal hunting ‘bag limits’ for each hunter. Depending on changes in population size, hunting bag limits are changed from year to year. In each of the following scenarios, suggest what changes might have occurred in the population in the previous year to warrant these changes in bag limits. (Address all four factors that affect population size.) a.) The mallard duck bag limit has increased from four ducks/day to eight ducks/day. b.) The previous year 1 female black bear could be taken, and up to 3 males could be taken. This year no females can be taken.11. An increase in one trait usually leads to a decrease in another. For example, if a species puts a lot of effort into reproduction in one year, it usually cannot put a lot of energy into growth that year. This example describes a: density-independent population. trade-off. survivorship curve. sampling error.5. Zebra mussels are an aquatic invasive species that are threatening the diversity and abundance of native species in the lake ecosystems of Alberta. Sylvan Lake is a beautiful recreational lake located in central Alberta. It has a total area of 43 km?. If the population of zebra mussels is estimated to be 128 mussels/200 km?, calculate the size of the zebra mussel population in Sylvan Lake. Show all work. Express your answer as a value rounded to one decimal place:
- 5. Describe a density-independent factor and explain why its effect on population growth is independent of population density 6. How do density-dependent factors limit population growth?6. What does the y-axis represent? 7. Exit the "How to Use" page by clicking on the x button on the top right. Move the growth rate r slider to its lowest value of 0.1, then gradually increase it. What happens to the population size as you increase the growth rate? 8. Now place the growth rate at r= 0.5. (You can do this by adjusting the slider, or you can type in the value in the box next to the r=" label and hit return.) Describe how the population growth varies if it starts from a small initial value (N, = 5 individuals) versus a larger initial value (N, = 100 individuals)? Change the "N" values accordingly to run each simulation. 9. Keep the growth rate at r= 0.5, and set N = 1000 individuals. What is N when t= 6? To answer this question, you can type the new value of " into the dialog box. Then, rescale the graph so that you can see the higher values of N: Click on the gear icon and change the Max value of Pop.(N.) to 25,000. N= For #10-12, match the parameters with the type of…5.Consider the population of Ontario in 1867 (1.5 million) and the population today (13 million). What factors do you think have contributed to a longer lifespan for individuals within this population? What factors have contributed to changes in family sizes? Do you think the lifespan of the average adult is expected to increase for the next few generations? Explain your answers
- 2. What is the generation time, net reproductive rate, and intrinsic rate of increase? 3. Plot the change in population size over time (for 10 years) starting with 10 individuals. 4. What would the female population size be in 25 years? 5. If hares were an endangered species, what other kinds of information would you need to gather to support your predictions made in 3 and 4?2)Which of the following best describes the difference between population size and population density? a)Population size measures the abundance of an organism, whereas population density measures the distribution b)Both variables measure abundance, but population density takes the into account the size of individuals, not just the number of individuals in the population c)Population size measures abundance, but population density measures how rapidly the size changes d)Population density measures the abundance of an organism, whereas population size measures the distribution e)None of these descriptions are correct2. Population dynamics: what does this term mean, and what are the four major processes that influence it?