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- 12. Which of the following dynamics are not predicted by the Lotka-Volterra predator-prey model using an exponential growth function (the simplest form)? a. exponential decline of the predator population in the absence of prey b. coexistence of predator and prey c. exponential growth of the prey population in the absence of predators d. none, all of these are predicted by the predator-prey model e. unstable oscillations in predator and prey density1. From the animals in the figure, which species could have a positive indirect effect on the Possum? 2. If you suspect that competition between Wallabies and Bandicoots is leading to coexistence, describe an example of a piece of evidence that would support your idea. 3. If Tasmanian devils become extinct in the wild due to DFTD, name a species other than cats that you expect would change in abundance as a result. Explain how you think that species' abundance would change and why.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.
- 1. What happens to the prey species when the predator species population increases? Why? Please answer.7)Which of the following is the best definition of a trophic cascade? a)Significantly changing the population size of one species causes significant changes in the population dynamics of other species b)Adding or removing one species causes significant changes the population dynamics of other species in the community c)Significantly changing the population size of a species at one trophic level causes significant changes in the population dynamics of populations that do not directly interact with this species d)Adding or removing species causes a collapse of the food web for that community e)None of these definitions are accurate1. What is the ecological relationship? 2. Give an actual example of an ecological relationship (e.g., predation, mutualism, commensalism, parasitism, amensalism, competition) that you find very interesting. Specify the species involved and provide the details of the relationship between the species. Also, explain why you found the particular example very interesting.
- 1. On the savannah of African exist two animals, the African Wild Dogs (Lycaon pictus) and the Spotted Hyenas (Crocuta crocuta). Both of these animals occupy a very similar niche in their community – a social carnivore, which hunts in packs. However, when their niche does completely overlap the Hyena will win the fight. Use this information to answer the following questions. a) If these two animals were to occupy the same habitat, knowing what you know about these populations, what do you think the outcome of these two populations would be? b) The African Wild Dog hunts at twilight, while the Spotted Hyenas hunt at night. This separation of niches allows for what ecological process to happen? Why is it important that this process happens? c) The population of African Wild Dogs is much smaller, and very isolated from one another. If you were trying to prevent this animal from going extinct – what would you focus your resources on conservation wise? (There are a number of answers for…2. If the food source is affecting the buffalo population, what do you predict the graph of the food source would look like? Either draw a graph or write a prediction.1. Let's take a brief look at ecological footprints on the national level. This is important, because each nation has different environmental policies and cultures. Do a comparison of your home country with others around the world using the instructions below. Use this Footprint of Nations website: (http://data.footprintnetwork.org/#/) Use the interactive map showing average ecological footprints for various countries. I recommend you choose the map option showing Ecological Deficit/Reserve. Once you have selected a country, a graph will appear showing the ecological footprint and biocapacity/ natural resource capacity of your selection. What you are determining is how much natural resource capital a nation has vs. how much it is using. List those values in the chart for the most recent year given. Be careful here: Because this is international information (metric system), the units of measure are in hectares, not acres! You can use either measurement but if you use acres you will…
- 1. What do the following terms mean?(a) the Community,b) population,c) ecological niche8 Analyze if the following pairs of statements are correct. Choose: A, if both statements are correct; B, if only the first statement is correct; C, if only the second statement is correct; or D, if both statements are incorrect. 2a. Population density refers to the number of individuals within a designated area. 2b. Richness pertains to the number of species present in a specific location.A niche is loosely defined as an organism's role in its environment, which can include factors such as feeding preference, nesting behaviors, mating behaviors, method of obtaining prey, and local habitats. Keeping Gause's law in mind, do some research on the California red-legged frog and the North Pacific tree frog (use wiki or another Google search). Create a chart comparing the two with respect to their niche or lifestyle that can explain how these two frogs can co-exist in the same ecosystem.