Ecology of Natural Resources 9.7.11

Ecology of Natural Resources 9.7.11 - Ecology of Natural...

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Ecology of Natural Resources Adjacent ecosystems often have a transition habitat with its own distinct vegetation and biota- ecotone Ecosystems are very complex functioning systems Human activities tend to simplify ecosystems by: Altering trophic webs Reducing habitat complexity Reducing biodiversity Unlimited resources results in exponential growth of living organisms- the rate of increase in numbers proportional to the population size Exponential growth can be expressed as: dN/dt=rN r=population growth rate The number of organisms is dependent only on how many are there and the growth rate Can this equation be true indefinitely? How do we incorporate all of the factors that “control” population size? dN/dt=rN(K-N/K) K = carrying capacity This is the logistic equation of population growth- exponential growth at small population sizes, slowing growth as the population approaches the carrying capacity Does not identify the factors responsible for slowing growth Environmental resistance
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Ecology of Natural Resources 9.7.11 - Ecology of Natural...

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