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- 1. Why is that there are no more than 5 or 6 trophic levels in a community? 2. Why do we need to conserve or protect threatened or endangered species, and how does the loss of species affect communities? 3. Why are population sizes not constant?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 densityQ1: What percentage of the original 10,000 Kilocalories is available to a shark that might eat the tuna in this figure? Q2: What trophic level and term would describe a predator of tuna? Q3: Give an example of a primary consumer in a terrestrial environment.
- 2. Janitor fish (Pterygoplichthys pardalis) live in the river dominates the other species inhabiting the same area. They compete for food, nutrients, and territory. Which of the following BEST describes a school of Janitor fish? * A. They are introduced species. B. They are keystone species. C. They are exotic species. D. They are invasive species.9) If the population of hawks in this area increases, their prey populations might decrease. Later, with fewer prey, the hawk population might decrease. The prey populations might then increase. This is an example of7)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 accurate
- 29. The competitive exclusion principle states that species that compete for the same resource in the same way: will end up with one eating the other to extinction. will have population numbers that cycle in response to one another. cannot coexist and one will outcompete the other. usually find a way to coexist.How do the classic experiments of C.F. Huffaker, using mites and oranges in the lab, inform us about how predator and prey populations are able to persist in nature?What role does the predator–preycycle play in the energy flow of an ecosystem?
- 1. What happens to the prey species when the predator species population increases? Why? Please answer.Figure 45.10b If the major food source of the seals declines due to pollution or overfishing, which of the following would likely occur? The carrying capacity of seals would decrease, as would the seal population. The carrying capacity of seals would decrease, but the seal population would remain the same. The number of seal deaths would increase but the number of births would also increase, so the population size would remain the same. The carrying capacity of seals would remain the same, but the population of seals would decrease.Which of the following events would not negatively impact Yellowstone’s grey wolf carrying capacity? snow in winter a beaver damming a river upstream a forest fire chronic wasting disease in the deer population