Another response to changing climate is for a population or species to evolve. We specifically focused on evolution shifting the temperature performance curve. In that discussion, we covered a number of factors that would help a population to evolve faster. What are two biological characteristics of a population (so NOT where they live) that would HELP it evolve its temperature performance curve to keep up with the shifting climate?
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- 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?Polar bears live on the ice cap near the North Pole. Their numbers aredwindling, apparently because of both pollution and global climatechange. List some specific ways that the melting of the Arctic ice capmight affect polar bear populations.SCIENCE, TECHNOLOGY, AND SOCIETY Some people regardthe rapid population growth of less industrialized countries asour most serious environmental problem. Others think that thepopulation growth in industrialized countries, though smaller,is actually a greater environmental threat. What problems resultfrom population growth in (a) less industrialized countriesand (b) industrialized nations? Which do you think is a greaterthreat, and why?
- In the short term what willhappen to the levels aboveand below a population ofsecondary consumers of anumeric pyramid if a largenumber of individuals fromthis population dies?The Atlantic cod population is of primary economic importance to fishingcommunities throughout the maritime provinces in Canada. Unfortunately, thispopulation has underwent an extreme collapse in recent years due to overfishing.Some argue, however, that the collapse of the cod population may actually beattributed to an increase in the population of harp seals, a known predator ofcod. One suggestion to help cod stocks recover is therefore to permit the huntingof harp seals on a large scale. Suggest and explain one potentially negativeconsequence of limiting the harp seal population.Explain at least one (1) adaption that our species may develop to continue surviving on earth
- The Barton Springs salamander is an endangered species found only inthree adjacent springs in the city of Austin, Texas. There is growingconcern that a chemical spill on a nearby freeway could pollute thespring and wipe out the species. To provide a source of salamanders torepopulate the spring in the event of such a catastrophe, a proposal hasbeen made to establish a captive breeding population of the salamanderin a local zoo. You are asked to provide a plan for the establishment ofthis captive breeding population, with the goal of maintaining as muchof the genetic variation of the species as possible. What factors mightcause loss of genetic variation in the establishment of the captivepopulation? How could loss of such variation be prevented? With theassumption that only a limited number of salamanders can bemaintained in captivity, what procedures should be instituted to ensurethe long-term maintenance of as much variation as possible?Another response to changing climate is for a population or species to evolve. We specifically focused on evolution shifting the temperature performance curve. In that discussion, we covered a number of factors that would help a population to evolve faster. What are two biological characteristics of a population (so NOT where they live) that would HELP it evolve its temperature performance curve to keep up with the shifting climate?WRITE ABOUT A THEME: INTERACTIONS One factorfavoring rapid population growth by an introduced speciesis the absence of the predators, parasites, and pathogens thatcontrolled its population in the region where it evolved. In ashort essay (100–150 words), explain how evolution by naturalselection in a region of introduction would influence the rateat which native predators, parasites, and pathogens attack anintroduced species.
- The 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?How and why did the agricultural revolution affect humanpopulation size? How and why did the industrial revolutionaffect human population size? Explain what benefitsand what environmental impacts have resulted.Part A: 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? part b: Based on the above question, what is the maximum population growth rate for the population if we assumedthe elephants were undergoing exponential growth?