Population Ecology III 2011

Population Ecology III 2011 - " N t = RN t K #...

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Outline Density Dependence: The concept, the graphs Density Dependence: The concept, the graphs The Logistic Equation The Logistic Equation Inverse Density Dependence Inverse Density Dependence Examples of Examples of Density Density Dependence Dependence
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Consider a population of microbes in a jar: What about the real world?
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Think about the RATE OF CHANGE of population size When per capita growth rate (R) is constant and >1… how fast is population size changing?
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Think about the RATE OF CHANGE of population size What’s happening here?
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K Change in population size ( Change in population size ( Δ N t ) as a function of population ) as a function of population size (N) size (N) Δ N t Population Size (N) Maximum growth rate Maximum growth rate 0 0 CARRYING CAPACITY (K): The number of individual organisms the resources of a given area can support.
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K Population Size as a function of time. Population Size as a function of time. Population Size (N) Time (years) Maximum growth rate Maximum growth rate Logistic Growth Logistic Growth 0 0
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The Logistic Equation
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Unformatted text preview: " N t = RN t K # N t K $ % & ( ) Change in population size " # $ % & = the potential rate of population growth " # $ $ $ % & the number of individuals, N " # $ $ $ % & the unutilized opportunity for population growth " # $ $ $ % & The Logistic Equation N is near zero: K " N t K is close to 1, indicating that most resources are under-utilized GROW GROW N is near K : is close to 0, indicating that most resources are utilized SLOW DOWN SLOW DOWN N is above K : is close to -1, indicating that most resources are over-utilized DROP DROP " N t = RN t K # N t K $ % & ( ) K " N t K K " N t K Self-thinning curve Imagine that instead of low density allowing high fecundity and survivorship, it caused a DECREASE in these rates. Population Size ( N ) Survivorship Regular density dependence Inverse density dependence or Allee Effect...
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This note was uploaded on 08/18/2011 for the course ECOLOGY 351 taught by Professor Staff during the Spring '11 term at Rutgers.

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Population Ecology III 2011 - " N t = RN t K #...

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