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Mon. Tues. Wed. Thurs. Fri. Week of Oct. 27. Week of Nov. 3. Exam 2 no OH. no OH. Forest ecology lab – dress for weather . Week of Nov. 10. Independent project analysis . Week of Nov. 17. T lab switch?. Lab Exam . River ecology lab – dress for weather .

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  1. Mon. Tues. Wed. Thurs. Fri. Week of Oct. 27 Week of Nov. 3 Exam 2 no OH no OH Forest ecology lab – dress for weather Week of Nov. 10 Independent project analysis Week of Nov. 17 T lab switch? Lab Exam River ecology lab – dress for weather

  2. For exam: - Chaps. 6,7,8,13 - Chap. 14 – only equations and concepts we talked about in class - Chapter 15 – only through p. 302. Lab open for counting Lemna every day 10 - 4

  3. Structure of course Environmental variability Organisms Ecosystems Populations Species interactions Communities Applied Ecological Issues

  4. Species interactions Introduction Consumer/resources interactions (predation, herbivory, parasitism) Competition Mutualism

  5. Change in pop. size of one species has an effect on growth rate of other species

  6. Species interactions Introduction Consumer/resources interactions (predation, herbivory, parasitism) Competition Mutualism

  7. Consumer/resource interactions - Consumer Resource + Arrows represent effect on growth rate

  8. Consumer Resource Predator Prey Parasite Host Herbivore Plant/algae Detritivore Dead organic matter

  9. Consumer form and function tied to their diet Examples??

  10. Consumer/resource interactions • Predation • Herbivory • Parasitism • Dynamics of C/R interactions

  11. Given that predators have adaptations that allow them to capture prey, why don’t predators drive their prey extinct?

  12. Periodical cicadas 100% 6,000 Cicada mortality due to predation Live cicadas per 1,000 m2 3,000 0% 0 May 15 May 30 June 15 June 30 Decline due to thunderstorm

  13. The predator’s predator - - Predator Prey +

  14. Consumer/resource interactions • Predation • Herbivory • Parasitism • Dynamics of C/R interactions

  15. Given that herbivores have adaptations that allow them to exploit resource, Why don’t herbivores drive plants extinct? Or Why is the world green?

  16. Spatial refuge Figure 17.1

  17. Production of population not individuals Cost Index of cone production

  18. Consumer/resource interactions • Predation • Herbivory • Parasitism • Dynamics of C/R interactions

  19. How is a parasite different from a predator?

  20. Parasites are incredibly diverse Examples?

  21. Parasites on wood mice On skin – 1 sp. tick. On fur – 12 sp. of mites, 1 sp. tick, 11 sp. fleas, 1 sp. lice. In stomach – 1 sp. roundworm. In small intestine – 3 sp. roundworms, 3 sp. flatworms, 2 sp. flagellates, 1 sp. ciliate, 1 sp. amoeba. In liver – 1 sp. tapeworm. etc. 47 species not counting bacteria and viruses

  22. Challenges for a parasite

  23. Figure 17.14

  24. pillbug = intermediate host tapeworm in a crow tapeworm changes pillbug behavior

  25. Challenges for a parasite • 2. overcoming host defenses

  26. Consumer/resource interactions • Predation • Herbivory • Parasitism • Dynamics of C/R interactions

  27. Dynamics of consumer/resource interactions Consumers can reduce resource populations Examples of cycles Models of consumer/resource interactions

  28. Figure 17.18 Effect on growth rate

  29. Figure 18.3

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