Biology 1001A Lecture Notes - Lecture 11: Commensalism, Coevolution, Cestoda
20 Jan 2020
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How various types of interactions between species or between populations (predation, parasitism, etc) affect each of the interacting parties: Coevolution: occurs when genetically based, reciprocal adaptation occurs in two or more interacting species. (e. g. flowers evolving in shape so they can be pollinated by bees or hummingbirds) Meaning of commensalism, mutualism, and parasitism; and recognize examples of each: Commensalism: one species benefits, and one is unaffected by the interaction. (e. g. orchids growing on branches of trees: rare in nature. Mutualism: both partners benefit. (e. g. bees pollinating flowers: common and can include co-evolved relationships. Evolutionary arms race: a struggle between competing sets of co-evolving genes, traits, or species, that develop adaptations and counter-adaptations against each other, resembling an arms race. Meaning of "life-dinner principle": selection pressure are much stronger on prey than on predators which is why prey often win arms races, prey are adapting to survive life, predators are adapting to eat prey - dinner.
