Biology 1001A Lecture Notes - Directional Selection, Generation Time, Wild Beasts
11 Sep 2013
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Lecture 22 arms race and virulence lecture outcomes: mutualistic, competitive and antagonistic relationships between species, given. Mutualism: when both species benefit: e. g. plant and pollinators, ants and plants that they live on, domestication. Competition: when both species suffer from interaction: species that coexist in the same area and compete for resources, each species is worse off because of the other"s presence. E. g. lions and cheetahs competing for same prey, plants competing for. Antagonism: one may benefit at expense of other space/sunlight/ soil nutrients: predation predator benefits and prey suffers, natural enemies, e. g. disease-causing organisms benefit at expense of host, e. g. herbivore/plant relationships, examples of red queen equilibrium. Neither side is gaining competitive advantage: factors that advantage one side or the other in an evolutionary arms race. Generation time: species with short generation time evolve faster. Population size: selection = more effective in large populations: there is more variation and more beneficial mutations.
