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BIOL 208 (March 10, 2014) - Coevolution, Ecology of Disease

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Biology (Biological Sciences)
Course Code
James Cahill

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BIOL 208 (March 10, 2014) • Coevolution: Red Queen Hypothesis o *Both species are evolving but their interactions with each other remain the same • You need to understand the L-Volterra equation. Don’t need to know how to derive it • Dilution Effect o *Prey death is greatest at intermediate prey density • *Coevolution o Aka Reciprocal evolution by 2+ species  *Cause evolution on each other (similar to predators putting evolutionary pressure on prey except that this type of pressure is exerted on both/all parties) • 2- species: Respond to each other (pairwise evolution)  Diffuse coevolution (3+ species) • Many species putting evolutionary pressures on each other • Hard to study o Another hypothesis:  *Stable cycling: • Ex. We can imagine 2 species with 3 genotypes for each species • The Ecology of Disease o *Parasites and pathogens  Ex. ticks (*an ectoparasite because it lives on the outside of the host)  *Endoparasite – parasite that lives inside the host • Ex. tapeworms  *Pathogens – agents that cause disease • Many parasites are pathogenic • Transmission: o *Direct vs. Indirect
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