end show slide 1 of 21 copyright pearson prentice hall 5-2 limits to growth
TRANSCRIPT
End Show
Slide 1 of 21
Copyright Pearson Prentice Hall
5-2 Limits to Growth
End Show
5-2 Limits to Growth
Slide 2 of 21
Limiting Factors
What factors limit population growth?
End Show
5-2 Limits to Growth
Slide 3 of 21
Copyright Pearson Prentice Hall
Limiting Factors
Limiting Factors
Limiting Nutrients:
The primary productivity of an ecosystem can be reduced when there is an insufficient supply of a particular nutrient.
End Show
5-2 Limits to Growth
Slide 4 of 21
Copyright Pearson Prentice Hall
Limiting Factors
In the context of populations, a limiting factor is a factor that causes population growth to decrease.
End Show
5-2 Limits to Growth
Slide 5 of 21
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 6 of 21
Copyright Pearson Prentice Hall
Density-Dependent Factors
Density-Dependent Factors
A limiting factor that depends on population size is called a density-dependent limiting factor.
End Show
5-2 Limits to Growth
Slide 7 of 21
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 8 of 21
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 9 of 21
Copyright Pearson Prentice Hall
Density-Dependent Factors
Density-dependent limiting factors include:
• competition
• predation
• parasitism
• disease
End Show
5-2 Limits to Growth
Slide 10 of 21
Copyright Pearson Prentice Hall
Density-Dependent Factors
Competition
Occurs when:
• populations become crowded
• organisms compete for:
•food, water, space, sunlight and other essentials
End Show
5-2 Limits to Growth
Slide 11 of 21
Copyright Pearson Prentice Hall
Density-Dependent Factors
Competition can also occur between members of different species.
can lead to evolutionary change
Over time, the species may evolve to occupy different niches.
End Show
5-2 Limits to Growth
Slide 12 of 21
Competition
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 13 of 21
Competition
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 14 of 21
Competition
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 15 of 21
Competition
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 16 of 21
Competition
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 17 of 21
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 18 of 21
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 19 of 21
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 20 of 21
Copyright Pearson Prentice Hall
End Show
5-2 Limits to Growth
Slide 21 of 21
Copyright Pearson Prentice Hall
Density-Dependent Factors
Predation
Populations in nature are often controlled by predation.
The regulation of a population by predation takes place within a predator-prey relationship.
End Show
Slide 22 of 21
5-2 Limits to Growth
Copyright Pearson Prentice Hall
Density-Dependent Factors
Wolf and Moose Populations on Isle Royale
Moose Wolves
End Show
5-2 Limits to Growth
Slide 23 of 21
Copyright Pearson Prentice Hall
Density-Dependent Factors
Parasitism and Disease
Parasites can limit the growth of a population.
A parasite lives in or on another organism (the host) and consequently harms it.
End Show
5-2 Limits to Growth
Slide 24 of 21
Copyright Pearson Prentice Hall
Density-Independent Factors
Density-Independent Factors
Density-independent limiting factors affect all populations in similar ways, regardless of the population size.
End Show
5-2 Limits to Growth
Slide 25 of 21
Copyright Pearson Prentice Hall
Density-Independent Factors
Examples of density-independent limiting factors include:
• unusual weather
• natural disasters
• seasonal cycles
• certain human activities—such as damming rivers and clear-cutting forests
End Show
- or -Continue to: Click to Launch:
Slide 26 of 21
Copyright Pearson Prentice Hall
5-2
End Show
Slide 27 of 21
Copyright Pearson Prentice Hall
5-2
A limiting factor that affects all populations in similar ways regardless of their size might be
a. drought.
b. disease.
c. predation.
d. crowding.
End Show
Slide 28 of 21
Copyright Pearson Prentice Hall
5-2
Which of the following would be a limiting factor affecting the panda population of China?
a. programs that educate people about endangered species
b. capture of some pandas for placement in zoos
c. laws protecting habitat destruction
d. a disease that kills bamboo plants
End Show
Slide 29 of 21
Copyright Pearson Prentice Hall
5-2
Density-dependent factors operate most strongly when a population is
a. large and dense.
b. large but sparse.
c. small and sparse.
d. small, but growing.
End Show
Slide 30 of 21
Copyright Pearson Prentice Hall
5-2
Within a limited area, if the population of a predator increases, the population of its prey is likely to
a. increase.
b. decrease.
c. remain about the same.
d. become extinct.
End Show
Slide 31 of 21
Copyright Pearson Prentice Hall
5-2
Which of the following is a density-independent factor affecting populations?
a. predation
b. disease
c. a destructive hurricane
d. parasites
END OF SECTION