Biology 1001A Lecture Notes - Lecture 22: Common Cold
8 Sep 2017
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Interaction of 2 species: mutualism, both benefit, both species are doing better together than they would have individually, ex. Ants & acacia tree: plants & pollinators, domesticating livestock, plants, etc, antagonism (natural enemies, one may use the other as a resource, exploiter benefits, resource suffers, ex. Predator & prey: plants & herbivores, host & parasite; parasite increases fitness at cost of host fitness, competition, both may incur costs, when 2 species use the same resource, they compete for the resources, ex. Newts evolve greater & greater toxicity, puts selective pressure on garter snakes= snakes evolve greater & greater resistance to toxins- cycles. If 2 species stop at the same time= stalemate. If 1 side has a faster generation time= evolve more quickly: selection on one side may not be as strong as the other (life- dinner principle, prey must escape from predator every time.
