Biology 1001A Lecture Notes - Lecture 23: Evolutionary Arms Race, Vertically Transmitted Infection, Limiting Factor

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Mutualistic, competitive and antagonistic relationships between species, given "real world" examples: mutualistic=both species benefit, when two species interact. Ants and plant, ants get shelter, food from plant, ant protects plant from other herbivores. Flowers and bees, pollen: competition=both species may incur costs, when two species interact. When two species compete for the same limiting resource. Suffer reduction in fitness or reduction in population size. Compete for water, sunlight: antagonism= when two species interact, one benefits and the other incurs costs. May keep escalating until costs outweigh benefit (red queen equilibrium) If the selection pressure is much stronger on one species than another it increases their rate of survival (selection pressure is stronger on prey) Meaning of "life-dinner principle: one selection pressure operates more intensely on one species. Road runner: predator prey, the prey has more at stake, it has its life at stake where the predator only has a meal at stake.

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