studyguide+quiz+3 - Negative feedback = when the system is...

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Disturbance provides a wide variety of niches because there will be areas at different stages of succession. Understand how population size can vary over time Population cycles in predators and prey Population changes during the succession process Damage = usually abiotic, due to pollution, hamful to ecosystem function usually due to toxicity. Disruption = usually biotic, interferes with normal interactions between species, either by adding or removing species. Destruction = removal of habitat, usually due to human land use. Desertification = damage to soil and vegetation causing dry sandy soil Deforestation = complete or partial removal of trees from forests Dynamic equilibrium = when a system remains stable, but with slight changes. A good example is population cycles in lynx and hares
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Unformatted text preview: Negative feedback = when the system is altered, it returns to its original state, like a thermostat (see dynamic equilibrium) Positive feedback = when the system is altered, it reacts by moving further from its original state, usually reaching a new state of equilibrium. o A good example of this is the exponential phase of population growth. As the population density increases, it makes reproduction easier. Eventually negative feedback will limit the positive feedback. o Another good example is how oxygen depleted dead zones can become self perpetuating. Invasive species = a species which is introduced to an ecosystem which spreads and out-competes native species...
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This note was uploaded on 10/20/2011 for the course ZOO 121 taught by Professor Russell during the Spring '08 term at Miami University.

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