POPULATION FLUCTUATION NOTES

REVIEW QUESTION 1:

What factors lead to exponential growth in populations?

REVIEW QUESTION 2:

What factors lead to logistic growth curves?

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When the birthrate of a population exceeds its death rate, the population decreases. increases. stays the same. increases then decreases.

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An S-shaped curve on a graph of population growth is characteristic of exponential growth. logistic growth. carrying capacity. delayed growth.

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Exponential growth in a population slows down or stops as resources become limited. rate of immigration increases. rate of emigration decreases. birth rate increases.

POPULATION FLUCTUATION NOTES

1. Limits to Population Growth: A. A limiting factor is a factor that

causes population growth to decrease.

POPULATION FLUCTUATION NOTES

1. Limits to Population Growth: A limiting factor is a factor that causes population growth to decrease.

a. Density Dependent Factors are limiting factors that depend upon the population size.

Examples include: Competition Predation Parasitism Disease

POPULATION FLUCTUATION NOTES

b. Density Independent Factors are limiting factors that do not depend upon a population’s size.

Examples include: Natural Disasters Seasonal Variation Human activities such as deforestation

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A limiting factor that affects all populations in similar ways regardless of their size might be drought. disease. predation. crowding.

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Within a limited area, if the population of a predator increases, the population of its prey is likely to increase. decrease. remain about the same. become extinct.

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Which of the following is a density-independent factor affecting populations? predation disease a destructive hurricane parasites