November 18 - Logistic growth curve(s-shaped Exponential...

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Logistic growth curve (s-shaped) Exponential growth curve (cannot have it cause resources are limited) An environment can only hold a certain number of individuals in a given species. Once a population has reached its carrying capacity, the population stays the same unless the environment changes. Carrying capacity of “k” will shift (go up or down). Population growth in relation to different environments Water beetles? 3 vials, 3 temperatures Growth curves are different for all 3 temperatures Moral of the story: population ( carrying capacity: k) is environment dependent Physical environment: temperature Organisms are encountering temperatures that vary Paramecium when grown alone they standard logistic growth curve; when grown together, one specie will become extinct— competitive exclusion: one species outcompetes the other. There isn’t always competitive exclusion. Carrying capacity for both can decline, instead. K levels are suppressed since competitors are going after the same resources. Outcome of population growth: Tasmanian sheep—eat grass, grass grows, and k levels plateau.
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November 18 - Logistic growth curve(s-shaped Exponential...

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