Canada lynx are predators of snowshoe hares. Which of the following represent density-dependent limitations on populations of Canada lynx? climate snowshoe hare population levels forest fires all of these
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Canada lynx are predators of snowshoe hares. Which of the following represent density-dependent limitations on populations of Canada lynx?
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- A population of 100 Asian elephants exhibits logistic growth. If the carrying capacity is 500 elephants and theper capita growth rate is 0.1 individuals/(individuals × year), what is the maximum population growth rate forthe population?The per capita growth rate of a population where dispersal is not a factor is expressed as (a) i + e (b) b d (c) dN/dt (d) rN(K N) (e) (K N) KTrumpeter swans were once widespread and abundant in North America. However, a combination of heavy hunting pressure and habitat lost drastically 4 reduced the species’ population down to less than 70 individuals in the wild by the mid-1930s. By the mid-1980s, Trumpeter swans were more prevalent again in Alberta, especially near Grande Prairie. The following graph depicts the estimated number of Trumpeter swans in Alberta, carried out at five-year intervals from 1985 to 2010. What growth pattern of the Trumpeter swan population in Alberta is being observed? What environmental conditions allow the growth pattern that you identified? What may cause the growth pattern that is being observed to change?
- What would happen to the moose population if the wolves were removed from the island? What happens to the population of wolf if the moose population will decrease? Identify 2 possible limiting factors that have influenced the wolf population?One concept of conservation biology is known as minimum viablepopulation. Some species’ populations are so fragmented andsmall that they may have very little genetic variability left. Withminimal genetic variation in the population, there is little likelihoodthat a population can adapt to an environmental threat, such as anew disease. Florida panthers are at or below the minimum viablepopulation level (estimated population less than 80). 1)Do you think that it is practical to use limited resources toconserve a population like the Florida panther? 2)Why?Is the changing buffalo and wildebeest population sizes caused by a changing predator (lion) population size?
- Upland game hunters in Illinois have been noticing a decrease in therabbit and pheasant populations over the past five years. They havelobbied the Department of Natural Resources and the statelegislature to allow them to shoot red-tailed hawks, one of therabbit’s and pheasant’s main predators. Explain why shooting hawkswill not ultimately solve the problem of a decreased rabbit andpheasant populationTwo winters ago, a species of bird called the pine siskin began appearing in droves at backyard bird feeders in my hometown. We would occasionally spot a few each winter, but numbers were unusually high that year. The next winter, it seemed as if all of the "extra" pine siskins had disappeared. Numbers fell back to the levels that we were used to seeing. Use the concept of carrying capacity to explain the irruption of pine siskins described in the scenario. Provide your answer in a standard paragraph using complete sentencesYou are an ecologist studyiìng movement behavior of a bird population. You attach radio-transmitters to each member of several different populations of the bird, allowing you to measure precisely how many birds emigrate from each of the populations each year. You gather the following data: Bird population size 712 Total number of birds emigrating per year 163 27 244 68 71 20 642 186 12 389 93 Does emigration represent a density-dependent process in this population? Explain your answer briefly. Enter your answer here
- The figure below shows population size oscillations for a fictional predator and its prey. Which of the statements below best describes what is happening in the time period marked by the gray box? prey predator 1 2 3 4 5 6 7 8 time O When there are few predators, the prey population increases O As prey population size increases, predator population increases As predator population size increases, the prey population decreases O When the prey population is small, predator abundance declines densityThe graph below shows changes in the size of an Emperorpenguin population in terms of numbers of breeding pairson the island of Terre Adelie in the Antarctic. Scientistsused these data along with data on the penguins’ shrinking ice habitat to project a general decline in the island’sEmperor penguin population, to the point where theywill be endangered in 2100. Use the graph to answer thequestions on the right. What was the overall percentage decline in thepenguin population from 1975 to 2010?In 2010, 150 coyotes (Canis latrans) were counted in Pierce County, WA. And the growth rate is 14 coyortes per year. Following a survey of the community, the social carrying capacity of coyotes was around 500 individuals. How long will it take for the coyote population to reach this human tolerance goal? Biologists have estimated the biological carrying capacity for coyotes in the county to be 1000 individuals. How long will it be before the population reaches carrying capacity using exponential growth? Would it take more or less time for the population to reach carrying capacity if using logistic growth equation and assumptions?