Biology 1002B Lecture Notes - Lecture 22: Evolutionary Arms Race, West Nile Fever, Common Cold
9 Apr 2016
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Plants competing for sunlight, in the desert animals compete for water, hunter"s compete for prey. Antagonism: one benefits, one suffers, ex. Adaptation by species a improves it"s ability to interact (avoid, abuse, ) species b. Putting a selection pressure on species b to evolve counter adaptation. Putting a selection pressure on species a to evolve counter-counter adaptation. So improved equipment improved success: ex. Modern day lion is much faster than ancestral lions, but this hasn"t given them an upper hand because the other species is evolving too. No one, may keep escalating until cost outweigh"s benefits: red queen equilibrium. Sometimes one side has the advantage, evolve faster if : short generation time, large populations are more like to habour more genetic variation, strength of selection. Prey loses his life, predator looks for another meal. Longer tongue in moths, longer beak in birds, in response plants have evolved longer pollen tubes and more diluted nectar.
