Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 54.2, Problem 1R
Summary Introduction
To review:
An equation, defining each variable used to describe the changes in a population size, which occurs due to births, deaths, immigration, and emigration.
Introduction:
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Name the four factors that affect population size.
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Life: The Science of Biology
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- The per capita birth (b) and death (d) rates are measured for two populations across a range of population sizes in the attached figure. The equation for exponential growth rate is dN/dt=rN where the per capita growth rate is r=(b-d). The equation for logistic population growth rate is dN/dt=rN(1-N/K). With logistic growth, r varies as a function of the population size with density-dependent birth and/or death rates. See attached image If the death rate decreased, what would happen to the population trajectory for population A? a) increase faster b) increase slower c) decrease faster d) decrease slowerarrow_forwardBriefly explain how each demographic parameter can affect a population. This can be in terms of population structure, growth, decline or survival of the individuals etc.? Dispersion Age structure Fecundity Mortality Sex-ratioarrow_forwardWhat effect does each of the following have on population size: natality, mortality, immigration, and emigration?arrow_forward
- Write a generalized model for exponential population growth. Define your terms. Then, draw a plot showing an example, being sure to label your axes.arrow_forwardWhat do you mean by population density?arrow_forwardExplain how to estimate the per capita rate of increase in a population. How would you estimate intrinsic rate of increase?arrow_forward
- Table 3.5 shows the number of deaths by age group in the United States in 2002 from all causes and incidents (unintentional injuries). Examine the rates mentioned below. Determine ,what to call each one then use the data to measure it as seen in the table. a. All-cause mortality rate for 25–34 year olds. Calculate the age-specific mortality rate. b. All-cause mortality among males. Calculate the sex-specific mortality rate.arrow_forwardIt is estimated that approximately 20,000 grizzly bears live in Western Canada, Yukon, and Northwest Territories. Currently, there are 146 grizzly bears remaining in Jasper National Park in an area of 7500 km2. Calculate the density of the grizzly bear population in Jasper Park. Express your answer as a value rounded to two decimal places. Units = grizzly bears/km2arrow_forwardName two density-dependent and two densityindependent factors that can limit the size of a population.arrow_forward
- Distinguish between the exponential and logistic growth of a population and describe the nature of their growth curves. Define environmental resistance. What is the carrying capacity of an environment? Define and give an example of a population crash.arrow_forwardIn the age structure diagram below, which of the following is true of this 2 points population? 100+ 95-99 90 - 94 85 - 89 80 - 84 75-79 70 - 74 65 69 60 - 64 55 - 59 50 - 54 45 - 49 40 - 44 35 - 39 30-34 25 29 20 - 24 15 19 10 - 14 5-9 0.4 295 236 177 118 59 59 118 177 236 295 Population (in thousands) Age Group Population (in thousands) It is from a developed country. It is stable. It is expanding. It is from a developing country. It is declining. This is a reguired questionarrow_forwardYou are studying a density - dependent turtle population that has the following relationships for the birth rate b’ and the death rate d’ as a function of population size (N) : b’ = 0.10 + 0.03 N - 0.0005 N ^2 d’ = 0.20 + 0.01 N Plot these functions in the same graph and discuss the population dynamics of the turtle. How does this model differ from the simple logistic model with linear birth and death functions?arrow_forward
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