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5-2 Limits to Growth
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Objectives: You will
Identify limiting factors that affect population growth
Photo Credit: ©Bruce Coleman, LTD/Natural Selection
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3. limiting factor habitat niche
Vocabulary
limiting factor habitat niche
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Limiting Factors
Limiting Factors
Food
Predators
Competition
Disasters
Disease
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5. Density-Dependent Factors
Habitat
Where an organism lives.
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6. Density-Dependent Factors
Niche
How an organism uses its habitat.
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7. Black-throated Green Warbler Yellow-rumped Warbler
Blackburnian Warbler
Black-throated Green Warbler
Cape May Warbler
Bay-breasted Warbler
Yellow-rumped Warbler
Figure 5.2 Sharing the wealth: Resource partitioning among five species of insect-eating warblers in the spruce forests of the U.S. state of Maine. Each species spends at least half its feeding time in its associated yellow-highlighted areas of these spruce trees.
Fig. 5-2, p. 103

8. Giant pandas eat mostly bamboo.
A specialist species.
Figure 4.17 This giant panda is eating a stalk from a bamboo tree. Bamboo stalks and leaves make up about 95% of the diet of this specialist species.
Fig. 4-17, p. 93

9. SPOTLIGHT Cockroaches: Nature’s Ultimate Survivors
350 million years old
Ultimate generalist
Can eat almost anything. .
Figure 4-A

10. Density-Dependent Factors
Wolf and Moose Populations on Isle Royale
The relationship between moose and wolves on Isle Royale illustrates how predation can affect population growth. In this example, the moose population was also affected by changes in food supply, and the wolf population was also affected by disease.
Moose Wolves
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11. Parasitism: Living on or in a host
Hookworm (a parasite)
Did You Know? One study of Pacific estuaries suggests that parasites play an important role in keeping these ecosystems healthy by controlling host populations.

12. Nine out of 10 of were too young to have reproduced, meaning they may have been the last generation of the bluefin tuna.

15. Endangered Species Keystone Species
two million wolves were destroyed.
Keystone Species
Keeps prey away from open areas near stream banks.
Figure 10-1

16. Human influences

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Quick Lab
Page 125
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Population Activity
cbp-2052
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Issues in Biology
Does the Gray Wolf Population Need Protection?
cbe-2052
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5-2 Section Assessment
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5-2
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5-2
A limiting factor that affects all populations in similar ways regardless of their size might be
drought.
disease.
predation.
crowding.
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5-2
Which of the following would be a limiting factor affecting the panda population of China?
programs that educate people about endangered species
capture of some pandas for placement in zoos
laws protecting habitat destruction
a disease that kills bamboo plants
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5-2
Parasites are most effective when a population is
large and dense.
large but sparse.
small and sparse.
small, but growing.
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5-2
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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5-2
Which of the following does not depend on the size of the population?
predation
disease
a destructive hurricane
parasites
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27. Copyright Pearson Prentice Hall
5-2
A limiting factor that affects all populations in similar ways regardless of their size might be
drought.
disease.
predation.
crowding.
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28. Copyright Pearson Prentice Hall
5-2
Which of the following would be a limiting factor affecting the panda population of China?
programs that educate people about endangered species
capture of some pandas for placement in zoos
laws protecting habitat destruction
a disease that kills bamboo plants
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5-2
Parasites are most effective when a population is
large and dense.
large but sparse.
small and sparse.
small, but growing.
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5-2
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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31. Copyright Pearson Prentice Hall
5-2
Which of the following does not depend on the size of the population?
predation
disease
a destructive hurricane
parasites
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32. END OF SECTION