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CHAPTER 13 - CHAPTER 13 A PREDATORS and PREDATION Predation...

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CHAPTER 13: PREDATORS and PREDATION A) Predation: Refers to the action of an organism that depends in total or in part on killing another animal for its food, e.g. bobcat, trout, hawk, robin, frog, and dragonfly. 1) Effect of predation -- three major opinions expressed: a) Bad effect: Unchecked, predators will eradicate their natural prey. b) No effect: Predators remove only those individual prey that would have died from other causes. c) Beneficial effect; Predators selectively cull less fit members from the prey population. 2) Compensatory mortality and predation: (see page 36) a) Threshold of security: That low level of population density of the prey species at which predators no longer find it profitable to hunt the prey. Above this line prey are at risk of predation. b) Pinch Period: That period of an annual cycle (seasonal) when the factors necessary for life are least favorable.
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c) Reproduction inversity principle: 1. Example: Coyote mortality Comparison of Average Litter Sizes of Coyotes
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