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Lecture4+5 - Lecture#4& Feedbackloops samesystem Negative&...

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Lecture #4&5 Systems and Ecosystems Feedback loops A circular process in which a system’s output serves as input to that  same system Negative & Positive do NOT mean bad and good Negative - output from a system moving in one direction acts as an  input That moves the system in the other direction Input & output neutralize one another Stabilizes the system (Ex. predator -> prey interactions) Positive - instead of stabilizing a system, it drives it further toward  one extreme or another (i.e. Erosion, melting sea ice) Rare   in   nature   but   common   in   natural   systems   altered   by  humans Central Case: The Gulf of Mexico’s “Dead Zone” Gulf “Dead Zone” = a region of water so depleted of oxygen that  marine organisms are killed or driven away
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