Biology 1001A Lecture 1: BioLec21-ArmsRaceVirulence
19 Feb 2016
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Triggered by key innovations (adaptive breakthrough) opens up new ecological niches (jaws, powered flight, flowers) Fast burst of speciation into many descendant lineages. Mutualistic (plants/birds, ants/acachia, domestication) both partners benefit. Competition (limited resource that both species need) each species has a reduction of success. Antagonistic (predator/prey) one species uses another, one benefits and one. Need to continually evolve and adapt in order to keep up with your natural. A series of escalating adaptations by one species that improves its ability to interact with another species, followed by a counteradaptation by the second species to improve its ability to interact with the first species. Result in improved equipment for survival, but don"t really get ahead . Who wins: may keep escalating until costs outweighs benefits, red queen equilibrium both sides stop adapting, too expensive, sometimes, one side has the advantage. Selection may not be as equally strong. Reproductive success: selection pressures are stronger on prey populations than predator.
