Biology 1001A Lecture Notes - Lecture 23: Herpes Labialis, Subtypes Of Hiv, Waterborne Diseases
3 Apr 2016
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Evolutionary arms race: interactions between 2 species: situations involving multiple species each exerting selection pressures on the other, each representing component of other"s environment. Both species benefit by having other species there. Ex. ants benefiting from living with plant, and defend plant when others try to eat it: mutual benefit. Humans established mutual relations with animals domestication: benefit by having species to be our companions, and animals benefit because their population would be smaller if they weren"t domesticated with humans. Arises when limiting resources that both species need in order to survive (food, prey: ex. what lion eats won"t be available to cheetah. Each species suffers reduction in fitness or population size because other species is present: each species would do better if other wasn"t around, ex. herbivores sharing water, ex. Doesn"t always have to result in death: plants and herbivores (insect eating plant, just decreasing fitness) One species uses the other one species is limiting resource for other species.
