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Population Ecology

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Population Ecology Chapter 52 ~ Population Ecology Population characteristics Density~ # of individuals per unit of area counts sample size estimate ... – PowerPoint PPT presentation

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Title: Population Ecology


1
Population Ecology
  • Chapter 52 Population Ecology

2
Population characteristics
  • Density of individuals per unit of area
    counts sample size estimate
    indirect indicators
    mark-recapture
  • Dispersion pattern of spacing random
    unpredictable, patternless spacing (a)
    clumped patchy aggregation (b)
    uniform even spacing (c)

3
Demography factors that affect growth decline
of populations
  • Birthrate (natality, fecundity) of offspring
    produced
  • Death rate (mortality)
  • Age structure relative number of individuals of
    each age
  • Survivorship curve plot of numbers still alive
    at each age

4
Population Growth Models
  • Exponential model (red)  idealized population in
    an unlimited environment (J-curve) r-selected
    species (rper capita growth rate)
  • Logistic model (blue) carrying capacity (K)
    maximum population size that a particular
    environment can support (S-curve) K-selected
    species

5
Population life history strategies
  • r-selected (opportunistic)
  • Short maturation lifespan
  • Many (small) offspring usually 1 (early)
    reproduction no parental care
  • High death rate
  • K-selected (equilibrial)
  • Long maturation lifespan
  • Few (large) offspring usually several (late)
    reproductions extensive parental care
  • Low death rate

6
Population limiting factors
  • Density-dependent factors competition
    predation stress/crowding
    waste accumulation
  • Density-independent factors weather/climate per
    iodic disturbances
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