BIOL 101 Guided Reading Questions GRQs Complete and submit this GRQ as a PDF before lecture and before your online Mastering Assignment L19 GRQs Populations Reading Objectives How do we estimate population size Compare and contrast the logistic and exponential population growth models Module 36 0 The study of population ecology can help protect endangered species 1 Why is it important to study populations such as the red panda We become better equipped to assess the imact of human population growth and to balance human needs with the conservation of biodiversity and resources Module 36 1 36 2 Population ecology is the study of how and why populations change Density and dispersion patterns are important population variables 1 Define Population a group of individuals of a single species that occupy the same general area and can potentially interbreed Population ecology the study of how members of a population interact with their environment focusing on factors that influence population density and growth Population density the number of indivduals of a species per unit area or volume Population dispersion the manner in which individuals in a population are spaced within their area Three types od dispersion patterns are clumped uniform and random 2 What are three types of dispersion patterns Describe or draw them too Clumped individuals are aggregated in patches uniform individuals are evenly distributed and random unpredictable distribution Module 36 4 Idealized models predict patterns of population growth 1 How does a population gain individuals Born and immigrate Lose individuals die and emigrate 2 How is the per capita rate of increase for a population represented symbol r 3 How is it calculated G N r G growth N total population numer 4 Work through the example population of 100 rabbits 100 rabbits in a field 50 are born in one month to these 100 rabbits The net increase of rabbits per month is 50 100 5 r 5 What is the equation for exponential population growth G rN BIOL 101 Guided Reading Questions GRQs Complete and submit this GRQ as a PDF before lecture and before your online Mastering Assignment 6 So if a rabbit population in which r 0 3 starts with 96 rabbits what will the growth be in one month Check your answer in Table 36 4A 29 7 Exponential growth model how would you describe it in words The larger the population size the more new individuals are added during each time interval 8 How would you describe the exponential model as a curve plot Draw it A j shaped curve with a steep increasing slope 9 Logistic growth model What is a limiting factor What does it do to growth An environmental factor that restricts population growth 10 What does a typical curve for logistic growth look like Describe in words and draw it J shaped at first but gradually levels off to represent an S 11 Define carrying capacity K in a population the number of individuals that an environment can sustain 12 What is the equation for logistic growth G rN K N K 13 As the resources get used up what happens to the equation That is what happens to population growth as the population size approaches carrying capacity As the population increases and N gets closer to carring capacity K N K becomes an increasingly smaller fraction Module 36 5 Multiple factor may limit population growth 1 What is the difference between a density dependent and a density independent limiting factor Give examples of both Density dependent limiting factors whose intensity is related to population density appear to restrict growth in natural populations density independent limiting factors is unrelated to population density Module 36 9 The human population continues to increase but the growth rate is slowing 1 What kind of growth exponential or logistic is demonstrated by the human population Exponential growth BIOL 101 Guided Reading Questions GRQs Complete and submit this GRQ as a PDF before lecture and before your online Mastering Assignment 2 What year might the human population start to level off 2050 3 What happens when birth rates and death rates are equal The population begins to level off 4 What is the demographic transition A shift from zero population growth in which birth rates and death rates are high to zero population growth characterized by low birth and death rates 5 Describe Table 36 9 The human population will continue to grow until it reaches its carrying capacity and then the birth and death rates will become even casuing the population to level off 6 What is the relationship between developed vs non developed countries to this transition The most developed countries have completed or are nearing the completion of their demographic transititons In developing countries death rates have dropped but high birth rates persist leading to a rapidly growing population Watch The Mystery of The Buffalo Boom 7 minutes https www youtube com watch v c8OBaxttzlA 1 What were some of the hypotheses that were tested for why the population might be increasing Food were rainfall records increasing causing an increase in grass Predators has there been a decrease in the number of lions and hyenas Disease rinderpest 2 How does this story of the buffalo boom relate to what you know about immunity A large portion of the population was vaccinated against rinderpest This portion had the antibodies to protect them against rinderpest 3 What was discovered about why the population was growing Rinderpest had been suppressing the populations but once the vaccination program eliminated the diesase in cattle rinderpest also disappeared from Serengeti wildlife Then the buffalo and wildbeast boomed
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