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Chapter 26.1

Chapter 26.1. Predator and prey. Predators and Prey. Many interactions among organisms are related to their feeding patterns. For example, some animals obtain food by killing and eating other organisms. Predators and Prey. Animals that obtain their food in this way are called predators.

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Chapter 26.1

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  1. Chapter 26.1 Predator and prey

  2. Predators and Prey Many interactions among organisms are related to their feeding patterns. For example, some animals obtain food by killing and eating other organisms.

  3. Predators and Prey Animals that obtain their food in this way are called predators. Some common predators are wolves, lions, robins, and flesh-eating sharks.

  4. Predators and Prey The organisms that are eaten by a predator are called prey.

  5. Predators and Prey Predator-prey relationships limit population density. In this way, they help maintain balance in an ecosystem.

  6. Predators and Prey In fact, predators may actually be beneficial to populations of prey animals by removing members who are weak or sick. This allows only the stronger members of the prey population to survive and reproduce.

  7. Predators and Prey Predator­prey relationships also prevent too large a population of prey organisms from developing. If there are not enough predators and too many prey, the prey population may starve or die of disease.

  8. Predators and Prey Look at the graph in Figure 26.3. It shows the changing populations of Canadian lynxes and snowshoe hares over an 80-year period. The lynx is the predator. The hare is the prey. As the number of hares increases, so does the number of lynxes. Then what happens? The increased number of lynxes causes a drop in the hare population. The lynxes then begin to starve to death, which allows the hare population to increase again.

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