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 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.

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End Show 5-2 Limits to Growth Slide 6 of 21 Copyright Pearson Prentice Hall Density-Dependent Factors A limiting factor that depends on population size is called a density-dependent limiting factor.

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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.

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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 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 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

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