Managing Our Natural Resources, 6e, Camp - 33

CHAPtER 3

Wolf

Concepts in Natural Resources Management

Hawk

Fox

Snake

Bird

Rat

Grasshopper

Ā© Cengage LearningĀ®

Caterpillar

FIguRE 3-8 a simplified
Plant

In a balanced ecosystem, the populations of plants and animals tend to be
fairly stable. The population of a particular plant or animal may experience periodic ups and downs. At the same time, its population level will tend to move up
and down around a sustainable level. If too many mice develop, predators will
multiply, eat the excess mice, and the mouse population will fall. The predators
will then decrease in numbers to match its food source. That does not always
apply to new species that are introduced in an ecosystem.
The USDA defines invasive species as any "species that is (1) non-native (or
alien) to the ecosystem under consideration and (2) whose introduction causes or is
likely to cause economic or environmental harm or harm to human health." Other
people define invasive species to include native plants or animals that increase in
numbers to the point they become harmful to other parts of the environment.

food web shows several
overlapping food chains.

33



Table of Contents for the Digital Edition of Managing Our Natural Resources, 6e, Camp

Contents
Managing Our Natural Resources, 6e, Camp - Cover1
Managing Our Natural Resources, 6e, Camp - Cover2
Managing Our Natural Resources, 6e, Camp - i
Managing Our Natural Resources, 6e, Camp - ii
Managing Our Natural Resources, 6e, Camp - iii
Managing Our Natural Resources, 6e, Camp - iv
Managing Our Natural Resources, 6e, Camp - v
Managing Our Natural Resources, 6e, Camp - Contents
Managing Our Natural Resources, 6e, Camp - vii
Managing Our Natural Resources, 6e, Camp - viii
Managing Our Natural Resources, 6e, Camp - ix
Managing Our Natural Resources, 6e, Camp - x
Managing Our Natural Resources, 6e, Camp - xi
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Managing Our Natural Resources, 6e, Camp - Cover4
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