5-2 Limits to Growth Slide 1 of 21
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2 Limiting Factors Limiting Factors The primary productivity of an ecosystem can be reduced when there is an insufficient supply of a particular nutrient. Ecologists call such substances limiting nutrients. 2 of 21
3 Limiting Factors A limiting nutrient is an example of a more general ecological concept: a limiting factor. In the context of populations, a limiting factor is a factor that causes population growth to decrease. Density-Dependent Factors A limiting factor that depends on population size is called a density-dependent limiting factor. 3 of 21
4 Density-Dependent Factors Density-dependent limiting factors include: competition predation parasitism disease 4 of 21
5 Density-Dependent Factors Density-dependent factors operate only when the population density reaches a certain level. These factors operate most strongly when a population is large and dense. They do not affect small, scattered populations as greatly. 5 of 21
6 Density-Dependent Factors Competition When populations become crowded, organisms compete for food, water space, sunlight, and other essentials. Competition among members of the same species is a density-dependent limiting factor. 6 of 21
7 Density-Dependent Factors Competition can also occur between members of different species. This type of competition can lead to evolutionary change. Over time, the species may evolve to occupy different niches. 7 of 21
8 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, one of the best-known mechanisms of population control. 8 of 21
9 Density-Dependent Factors Wolf and Moose Populations on Isle Royale Moose Wolves 9 of 21
10 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. Density-Independent Factors Density-independent limiting factors affect all populations in similar ways, regardless of the population size. 10 of 21
11 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 11 of 21
12 5-2 Continue to: - or - Click to Launch: 12 of 21
13 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. 13 of 21
14 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 14 of 21
15 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. 15 of 21
16 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. 16 of 21
17 5-2 Which of the following is a density-independent factor affecting populations? a. predation b. disease c. a destructive hurricane d. parasites 17 of 21
biology Slide 1 of 21 End Show Copyright Pearson Prentice Hall
biology 1 of 21 2 of 21 Limiting Factors What factors limit population growth? 3 of 21 Limiting Factors Limiting Factors The primary productivity of an ecosystem can be reduced when there is an insufficient
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