Population Ecology Characteristics of Populations

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Population EcologyCharacteristics of Populations

• SC.912.L.17.1

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Population Characteristics

• Population ecology is the study of interactions
  within populations (i.e., intraspecific
  interactions)
• Recall that populations are groups of interacting
  conspecifics (e.g., inter-mating)
• We can characterize individual populations in
  terms of there
• Size (average vs. variation)
• Density ( impacts on size density dependence)
• Patterns of Dispersion
• Demographics (age structure, sex ratios)
• Rates of growth (or decline)
• Limits on population growth

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• Population Dynamics

• Three Key Features of Populations
• Size
• Density
• Dispersion
• (clumped, even/uniform, random)

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Population Dispersion
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Why Different Types?
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Population Demographics
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Age Distribution

• distribution of males and females in each age
  group of a population
• used to predict future population growth

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Age-Structure Pyramids
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• Three Key Features of Populations

1. Size number of individuals in an area
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Three Key Features of Populations
Growth Rate Birth Rate (natality) - Death Rate
(mortality) How many individuals are born vs. how
many die Birth rate (b) - death rate (d) rate
of natural increase (r).
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How are populations measured?

• Population density number of individuals in a
  given area or volume
• count all the individuals in a population
• estimate by sampling

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