14.4 Population Growth Patterns

Front

Immigration

Back

is the movement of individuals

into a population from another population.

Front

Emigration

Back

is the movement of individuals

out of a population and into another population.

Front

exponential growth

Back

occurs

when a population size increases

dramatically over a period of time

Front

logistic growth

Back

a population begins with a period

of slow growth followed by a brief

period of exponential growth before

leveling off at a stable size

Front

carrying capacity

Back

is the maximum number of individuals of

a particular species that the environment can normally and consistently support.

Front

A population crash

Back

is a dramatic decline in the size of a

population over a short period of time. There are many reasons why a population

might experience a crash.

Front

The factor that has the greatest effect in keeping down the

size of a population is called

Back

The limiting factor

Front

A population of algae in a pond is limited in size by the amount of

sunlight that strikes the pond’s surface. Is sunlight a density-dependent or

density-independent limiting factor for the algae population?

Back

It is density-independent

unless the algae population becomes

large enough to block sunlight.

Front

Predict What would have eventually happened to the reindeer herd if the winter

had not made foraging so difficult? Explain

Back

Because of the limited

quantity of food on the island, the

population would have stopped growing

and then leveled off and eventually

decreased as food became scarce.

Front

Analyze How does the wolf population on Isle Royale affect

the carrying capacity of the moose population?

Back

Wolves keep the population

of moose at a level that the

environment can support.