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1. Compile a list of families you know ell. What is the average number of children per couple? If this were the average for the world population, and if all the children survived, what would be the doubling time of the population? Use a graphing paper and assume 30 years as a generation, refer to the table below. 2. Collect new paper clippings on the effect of population on natural communities, study the articles again for evidence connecting the population explosion with pollution of the environment. Do you find any evidence that the population or pollution problems are being solved? The relationship between growth and doubling time Annual rate of growth Doubling time (percent) 0.5 1 2 3 4 5 7 10 (years) 140 70 35 23.33 15.5 14 10 7 The general rule of thumb is to determine the doubling time, divide 70 by the growth rate. Conversely, to determine the growth rate, divide 70 by the doubling time. This rule will work for growth rates and doubling times that you are likely to encounter in your activity. But at very high growth rates, these rules do not work. For instance, at a 70% annual growth rate, in a one-year population of, let us say 100 individuals, will have increased by 70 individuals, and the population then consists of 170 individuals. In other words, the population has not yet doubled in size at the end of the year. Yet if you divide the growth rate by 70, you get 70/70 = 1 year as doubling time which it obviously is not.

1. Compile a list of families you know ell. What is the average number of children per couple? If this were the average for the world population, and if all the children survived, what would be the doubling time of the population? Use a graphing paper and assume 30 years as a generation, refer to the table below. 2. Collect new paper clippings on the effect of population on natural communities, study the articles again for evidence connecting the population explosion with pollution of the environment. Do you find any evidence that the population or pollution problems are being solved? The relationship between growth and doubling time Annual rate of growth Doubling time (percent) 0.5 1 2 3 4 5 7 10 (years) 140 70 35 23.33 15.5 14 10 7 The general rule of thumb is to determine the doubling time, divide 70 by the growth rate. Conversely, to determine the growth rate, divide 70 by the doubling time. This rule will work for growth rates and doubling times that you are likely to encounter in your activity. But at very high growth rates, these rules do not work. For instance, at a 70% annual growth rate, in a one-year population of, let us say 100 individuals, will have increased by 70 individuals, and the population then consists of 170 individuals. In other words, the population has not yet doubled in size at the end of the year. Yet if you divide the growth rate by 70, you get 70/70 = 1 year as doubling time which it obviously is not.

Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter52: Population Ecology
Section: Chapter Questions
Problem 9TYK
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1. Compile a list of families you know ell. What is the average number of children per couple? If this were the average for the world population, and if all the children survived, what would be the doubling time of the population? Use a graphing paper and assume 30 years as a generation, refer to the table below. 2. Collect new paper clippings on the effect of population on natural communities, study the articles again for evidence connecting the population explosion with pollution of the environment. Do you find any evidence that the population or pollution problems are being solved? The relationship between growth and doubling time Annual rate of growth (percent) Doubling time (years) 140 0.5 1 2 3 4 5 7 10 70 35 23.33 15.5 14 10 7 The general rule of thumb is to determine the doubling time, divide 70 by the growth rate. Conversely, to determine the growth rate, divide 70 by the doubling time. This rule will work for growth rates and doubling times that you are likely to encounter in your activity. But at very high growth rates, these rules do not work. For instance, at a 70% annual growth rate, in a one-year population of, let us say 100 individuals, will have increased by 70 individuals, and the population then consists of 170 individuals. In other words, the population has not yet doubled in size at the end of the year. Yet if you divide the growth rate by 70, you get 70/70 = 1 year as doubling time which it obviously is not.
Transcribed Image Text:1. Compile a list of families you know ell. What is the average number of children per couple? If this were the average for the world population, and if all the children survived, what would be the doubling time of the population? Use a graphing paper and assume 30 years as a generation, refer to the table below. 2. Collect new paper clippings on the effect of population on natural communities, study the articles again for evidence connecting the population explosion with pollution of the environment. Do you find any evidence that the population or pollution problems are being solved? The relationship between growth and doubling time Annual rate of growth (percent) Doubling time (years) 140 0.5 1 2 3 4 5 7 10 70 35 23.33 15.5 14 10 7 The general rule of thumb is to determine the doubling time, divide 70 by the growth rate. Conversely, to determine the growth rate, divide 70 by the doubling time. This rule will work for growth rates and doubling times that you are likely to encounter in your activity. But at very high growth rates, these rules do not work. For instance, at a 70% annual growth rate, in a one-year population of, let us say 100 individuals, will have increased by 70 individuals, and the population then consists of 170 individuals. In other words, the population has not yet doubled in size at the end of the year. Yet if you divide the growth rate by 70, you get 70/70 = 1 year as doubling time which it obviously is not.
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