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23 lecture April 17

23 lecture April 17 - Human Ecology The history of human...

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1 1 Human Ecology The history of human populations An ecological puzzle: The recent growth of the human population Testing alternative solutions to the puzzle Exam average = 80 Final exam will incorporate some questions based on exams 1-3 2 Another test of the possible role of predators in controlling herbivores Oak tree, herbivorous caterpillar and predatory blue jay 3 Spray = oak tree leaves sprayed with insecticide. Control = leaves left unsprayed and open to birds and insects. Cage = leaves caged so that birds were excluded but not herbivorous insects. 4 26. The data above support which of the following hypotheses? Oaks are not eaten as much as one would think because … a. Predators remove many herbivores from ecosystems c. Both predator pressure and plant defenses contribute to a reduction in herbivore consumption of oak leaves
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