Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 53, Problem 1TYU
Population ecologists follow the fate of same-age cohorts to
- (A) determine a population's
carrying capacity . - (B) determine the birth rate and death rate of each group in a population.
- (C) determine if a population is regulated by density-dependent processes.
(L)) determine the factors that affect the
size of a population .
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The observation that members of a population are uniformlydistributed suggests that(A) resources are distributed unevenly.(B) the members of the population are competing for access toa resource.(C) the members of the population are neither attracted to norrepelled by one another.(D) the density of the population is low
1.) At approximately what year did the human population enter an exponential growth phase?
2.) Prior to that time, what was the approximate carrying capacity of Earth?
3.) State three significant technological developments that have acted to increase the carrying capacity of Earth’s environment since that time.
4.) Provide two examples of density-dependent factors that are contributing to or have the potential to contribute to environmental resistance in human populations.
How does the study of population ecology help us understand why some populations grow, some remain stable, and others decline?
a.) Why has human population growth, which increased exponentially for centuries, started to decline in the past few decades?
b.) What is carrying capacity? Do you think carrying capacity applies to people as well as to other organisms? Why or why not?
Chapter 53 Solutions
Campbell Biology
Ch. 53.1 - DRAW IT Each female of a particular fish species...Ch. 53.1 - Prob. 2CCCh. 53.1 - Prob. 3CCCh. 53.2 - Explain why a constant per capita rate of growth...Ch. 53.2 - Prob. 2CCCh. 53.2 - Prob. 3CCCh. 53.3 - Explain why a population that fits the logistic...Ch. 53.3 - WHAT IF? Given the latitudinal differences in...Ch. 53.3 - Prob. 3CCCh. 53.4 - Identify three key life history traits, and give...
Ch. 53.4 - Prob. 2CCCh. 53.4 - Prob. 3CCCh. 53.5 - Prob. 1CCCh. 53.5 - Prob. 2CCCh. 53.5 - WHAT IF? Suppose you were studying a species that...Ch. 53.5 - Prob. 4CCCh. 53.6 - How does a human population's age structure affect...Ch. 53.6 - How have the rate and number of people added to...Ch. 53.6 - WHAT IF? Type "personal ecological footprint...Ch. 53 - Gray whales (Eschrichtius robustus) gather each...Ch. 53 - Suppose one population has an r that is twice as...Ch. 53 - Prob. 53.3CRCh. 53 - Prob. 53.4CRCh. 53 - Density-dependent factors regulate population...Ch. 53 - The human population is no longer growing...Ch. 53 - Population ecologists follow the fate of same-age...Ch. 53 - A population's carrying capacity (A) may change as...Ch. 53 - Scientific study of the population cycles of the...Ch. 53 - Analyzing ecological footprints reveals that (A)...Ch. 53 - Based on current growth rates, Earth's human...Ch. 53 - The observation that members of a population are...Ch. 53 - According to the logistic growth equation...Ch. 53 - During exponential growth, a population always (A)...Ch. 53 - Prob. 9TYUCh. 53 - Prob. 10TYUCh. 53 - EVOLUTION CONNECTION Contrast the selective...Ch. 53 - Prob. 12TYUCh. 53 - Prob. 13TYUCh. 53 - WRITE ABOUT A THEME: INTERACTIONS In a short essay...Ch. 53 - SYNTHESIZE YOUR KNOWLEDGE Locusts (grasshoppers in...
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- Which of the following is true of a population approaching its carrying capacity? a) The population’s emigration is greater than its immigration. b) The population has access to unlimited resources. c) Intraspecific competition decreases. d) The population’s rate of increase approaches zero.arrow_forward2)Which of the following best describes the difference between population size and population density? a)Population size measures the abundance of an organism, whereas population density measures the distribution b)Both variables measure abundance, but population density takes the into account the size of individuals, not just the number of individuals in the population c)Population size measures abundance, but population density measures how rapidly the size changes d)Population density measures the abundance of an organism, whereas population size measures the distribution e)None of these descriptions are correctarrow_forward1)Questions related to population dynamics look at which aspect of a population? a)The factors that determine the maximum population size that can be supported in an environment b)How diseases are transmitted through a population c)How the genetics of a population change over time d)How & why population size changes over time e)How the number of species in an environment changes over timearrow_forward
- During what phase of the growth curves in each diagram is the population just beginning to colonize an area? (C) a) Which type of population growth appears to continue unchecked? b) The growth curves in the Model are often referred to using the letters of the alphabet they resemble. The logistic growth curve is sometimes referred to as an S-curve. What letter would you use to describe the exponential growth curve? c) What causes the population to slow down during logistic growth? d) The maximum population an environment can sustain is affected by environmental factors that cause the population to level out or become stable. What term is used to describe this level of logistic growth? Diagram A-Exponential Growth Curve Population Numbers Exponential growth Lag phase Time Population Numbers Diagram B-Logistic Growth Curve Lag phase Time Carrying capacity (K) Pressure begins due to environmental resistancearrow_forward49) Carrying capacity is A) seldom exceeded in real populations. B) the maximum population size that a particular environment can support. C) fixed for most species over most of their range most of the time. D) determined by density and dispersion data. E) the term used to describe the stress a population undergoes due to limited resources. 17) The small intestine has a very large surface area that directly facilitates high rates of A) digestion. B) absorption. C) elimination. D) filtration.arrow_forwardA human population of 10,000 individuals has a birth rate of 90 per every 1000 persons and a death rate of 16 per every 1000 individuals. Calculate the yearly increase of the population growth. a) 740 individuals/year b) 74 individuals/year c) 10,074 individuals/year d) 11,074 individuals/yeararrow_forward
- A population’s carrying capacity(A) may change as environmental conditions change.(B) can be accurately calculated using the logistic growth model.(C) increases as the per capita population growth rate decreases.(D) can never be exceeded.arrow_forwardIn populations of unitary organisms, growth rates and rates of development are generally influenced by intraspecific competition. This essentially leads to density-dependent effects on the composition of a population. 1) Explain/discuss figure b (limpets) 2) Explain/discuss figure a (reindeers)arrow_forwardAssume that the population of the greater roadrunner in the Guadelope Desert was 250 per hectare at the beginning of 1999. If the carrying capacity, K , is 750 and r=0.25 per year, what is the number ofroadrunners: (a) after a year later, (b) ten years later, (c) after a score, (d) a century later, and (e) a millennium later?arrow_forward
- Natality, mortality, immigration, and emigration are all terms related to any population. a) Describe briefly what each term means. b) Explain briefly how each process effects a population. c) Which of the terms do not relate to a closed population? Explain why not. d) Brainstorm several examples of closed populations that occur naturally. Contrast these with examples of closed populations produced by human intervention or other activities.arrow_forwardWhich of the following populations would be growing? a) Geometric rate (1) = 0.63 b) Exponential growth rate (r) = 0.63 c) Net reproductive rate (R0) = 0.63 d) All of the above populations are growingarrow_forwardThe continued growth of a population with a young age structure, even after its fertility rate has declined, is known as (a) population doubling (b) iteroparity (c) population growth momentum (d) r selection (e) density dependencearrow_forward
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