Eeb 2023 Study guides, Class notes & Summaries

Chapter 4 host population dynamics Last document update:   ago

Host populations So far we have been talking about the population dynamics of the pathogens themselves; now we’ll discuss how parasites affect the population dynamics of their hosts, whether wildlife (animal or plant) or human. Regulation Do parasites control population size? How? High infection rate, intermediate virulence (disease-induced death rate) have the greatest impact on a population (because virulence lowers by killing hosts “too quickly”). Can parasites regulate a populat...

Host-parasite coevolution; origin and maintenance of sex Last document update:   ago

Antagonistic coevolution The costs of parasitism lead to antagonistic coevolution between hosts and parasites. Hosts can evolve resistance (typically by closing the compatibility filter) or tolerance (focusing on resistance this week). Stahl et al. (1999): Arms races in a disease-resistance locus of Arabidopsis Red Queen (cyclic) new alleles arise frequently frequency-dependent selection: rare alleles in the parasite, or host, have an advantage resistance alleles tend to be monomorphic ...