Concepts of Biology
Concepts of Biology
1st Edition
ISBN: 9781938168116
Author: Samantha Fowler, Rebecca Roush, James Wise
Publisher: OpenStax College
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Chapter 19, Problem 1ACQ

Figure 19.2 As this graph shows, population density typically decreases with increasing body size. Why do you think this is the case?

Chapter 19, Problem 1ACQ, Figure 19.2 As this graph shows, population density typically decreases with increasing body size.

Expert Solution & Answer
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Summary Introduction

To write:

The population density depending upon the body size of the organisms.

Introduction:

Populations are dynamic entities. In response to various factors, their size and composition change, including seasonal and annual changes in the environment, natural disasters such as volcanic eruptions, forest fires, and competition between or within species for resources.

Explanation of Solution

The graph depicts a density-dependent population. Populations are identified by population size and population density. A population can have a large number of people densely or sparsely distributed. There are also populations with small amounts of individuals that can be dense or very slightly distributed in a local area. Population size may affect the adaptation potential as it affects the number of genetic variation in the population. Density can affect interactions in a population such as food competition and individuals ' ability to find a partner. Smaller individuals are more densely distributed than larger individuals.

Conclusion

Thus, the size of the body is regulating the density of the population. The population with smaller body size shows more density than those which have a larger body size.

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Which of the following statements about the world population is NOT true? The world population was about 6 billion in 2000. The United Nations projects that the world population in 2200 will be about 10 billion people. Analysts estimate that the global carrying capacity of the earth is about 10 billion people. Much of the world population growth will take place in Asia, Latin America, and Africa.
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 slower
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