Loose Leaf For Integrated Principles Of Zoology
18th Edition
ISBN: 9781260411140
Author: Cleveland P Hickman Jr. Emeritus, Susan L. Keen, David J Eisenhour Professor PhD, Allan Larson, Helen I'Anson Associate Professor of Biology
Publisher: McGraw-Hill Education
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Chapter 38, Problem 8RQ
Growth of a population can be hindered by either density-dependent or density-independent mechanisms. Define and contrast these two mechanisms. Offer examples of how growth of the human population might be curbed by either agent.
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Chapter 38 Solutions
Loose Leaf For Integrated Principles Of Zoology
Ch. 38 - The term ecology is derived from the Greek meaning...Ch. 38 - Prob. 2RQCh. 38 - Prob. 3RQCh. 38 - Define the niche concept. How does the realized...Ch. 38 - Populations of independently living (unitary)...Ch. 38 - Prob. 6RQCh. 38 - Contrast exponential and logistic (= sigmoid)...Ch. 38 - Growth of a population can be hindered by either...Ch. 38 - Herbivory is beneficial for the animal (+) but...Ch. 38 - Prob. 10RQ
Ch. 38 - Define predation. How does the predator-prey...Ch. 38 - Prob. 12RQCh. 38 - Prob. 13RQCh. 38 - What is a trophic level, and how does it relate to...Ch. 38 - Define productivity as the word is used in...Ch. 38 - Prob. 16RQCh. 38 - What conditions produce an inverted pyramid of...Ch. 38 - Prob. 18RQCh. 38 - Prob. 19RQCh. 38 - What do paleontological studies show about the...Ch. 38 - Prob. 1FFT
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- For each of the following, indicate if it describes what is generally a density-dependent or density independent population growth regulator. A windstorm blows all of the blue jays nests [ Choose ] out of the trees, crushing all of the blue jay eggs The size of a mouse population increases as [ Choose ] the number of predatory hawks decreases An Australian forest fire kills all of the sloths [ Choose ] An exterminator tents a house to kill all of [ Choose ] the termitesarrow_forwardWrite a generalized model for exponential population growth. Define your terms. Then, draw a plot showing an example, being sure to label your axes. Write a formula that extends the preceding model to incorporate carrying capacity, producing sigmoidal population growth. Define your terms. Then, draw a plot showing an example, being sure to label your axes.arrow_forwardDuring 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_forward
- Populations are unable to sustain exponential growth for very long because environments are not unlimited. Eventually growth rates are reduced by a shortage of food, space or some other factor. These factors constitute what is known as ‘environmental resistance’ and their effect upon growth may produce a logistic growth curve. The data shown in the Table below illustrate this pattern of growth for three species’ populations, each beginning with a population of 10 individuals. Table 1: Temporal changes in the numbers of individuals of three different species’ populations, observed in the wild. Time (units) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Population 1 10 15 20 28 39 48 57 66 81 88 93 107 108 108 108 108 119 Population 2 10 11 12 14 17 19 21 25 29 33 37 41 40 43 46 49 46 Population 3 10 17 27 39 52 64 67 69 70 78 83 86 88 80 84…arrow_forwardAre the following statements True or false? 1) Population growth of many species is expected to be either exponential or geometric, unless some factor such as competition or predation is introduced. 2) The age distribution of populations reflects the influence of per capita rates of births, death, immigration, and emigration.arrow_forwardTwo alien species compete for resources on a planet far far away. Their initial populations are 100 and 1000 and their specific growth rate is 0.02263/year and 0.02/year and their yield coefficient is 0.95 and 0.85 respectively. When the first species begins to consume more than 50% of the resources the other population will be inevitably be annihilated. How many years does it take for this to occur? Answer:arrow_forward
- Draw a graph with a growth curve for a population that starts at 10 individuals and experiences exponential growth. Draw a second graph with a growth curve for a population that starts with 10 individuals and undergoes logistic growth. The second graph should have a carrying capacity of 100 individuals. Please give a proper written explanation for the graphs.arrow_forward1.) 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.arrow_forwardJust Explain the difference between density-independent and a density-dependent processes influencing population growth. Each of the example show up.arrow_forward
- Describe the exponential model of population growth give the characteristics of species that follow this model of population growth.arrow_forwardFind examples of: One density-independent factor that can influence an organism's intrinsic growth rate. One density-dependent factor based on population regulation and one factor based on the Allee effect that can influence an organism's intrinsic growth rate.arrow_forwardIn the logistic model of population growth, per capita growth rates are highest at __ densities and population growth rates are highest at ___ density (NOTE: assume ‘high’ refers to at or near K). A) low, intermediate B) low, low C) low, high D) None of the above are truearrow_forward
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