Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Discuss Concepts Choose an animal or plant species that lives in your environment and identify the density-dependent and density-independent factors that might influence its population size. How could you demonstrate conclusively that the factors are either density-dependent or density-independent?

Summary Introduction

To review:

The factors that influence the population size of an organism and. Also, determine whether the factors responsible are density-dependent or density-independent.


The population size of an organism is the number of organisms of the same species that are living in the same habitat, in the same geographical area and can interbreed within themselves. Populations experience variations in size and density with time. There are many factors like influence size, density, age structure, and geographical range that affect the population size of an organism.


The factors that influence population size are all density-dependent. Their influence on population either increases or decreases according to the size of the population. The density-dependent environmental factors include predation and intraspecific competition. The effects of these density-dependent factors are expressed by a logistic model where the per capita death and birth rate change with population density...

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