Biology 1001A Lecture Notes - Flowering Plant, Adaptive Radiation, Sexually Transmitted Infection
Document Summary
Evolutionary innovations can induce adaptive radiation: angiosperms use animals as pollinators, different pollinators -> reproductive isolation. What"s in it for the bird: nectar, food. When two species interact: both may benefit: mutualism, both may suffer: competition, one may benefit at the expense of the other: anatgonism. Evolutionary arms race: adaptation by species a improves its ability to interact with species b, selection pressure on b to evolve counter-adaptation, selection pressure on a to evolve counter-counter-adaptation. Who wins the arms race: may keep escalating until costs outweigh benefits. Red queen equilibrium: sometimes, one side has the advantage. Life-dinner principle: prey need to run for their lives, if got caught, they"re dead, predator just don"t get to eat, if does not catch a prey. Back to antagonism host-parasite relationships: parasite gets resources at the expense of host fitness, some parasites more virulent than others. Prudent-parasite hypothesis: parasite that kills its host too soon, before colonizing a new host, is doomed.
