Population Size and Determination

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Author:
rica_ross
ID:
236723
Filename:
Population Size and Determination
Updated:
2013-09-24 09:13:38
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Biology GRE
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Biology GRE
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  1. Population
    Defined as group of organisms from a particular species that inhabit the same area
  2. Limiting Factors
    • Stop unrestrained and unregulated growth of a population
    • Deteremine Carrying capacity
    • ex: Climate and supply for resources, space
  3. Exponential Growth
    • Unlimited rapid growth in brief period of time
    • Resources are plentiful and all organisms can reproduce at maximum rate
    • Change in N/Chnge in T= Rmax
  4. Population Growth Symbols
    • Rmax- maximum rate of growth
    • B- birth rate
    • D - death rate
    • N- number of individuals
    • K - carrying capacity
  5. Logistic Growth Model
    • Realistic pattern in growth of population
    • Increases exponentially until carrying capacity where it stabilizes

    • Change in N/Chnge in T= Rmax
    • Rmax(K-N/K)=Real population
  6. Carrying capacity
    • Maximum size at which population can stably interact with environment from long period of time, without damaging the habitat or impairing the habitat productivity
    • Can go over the capacity, but is brought back down
  7. Density Dependent Factors
    • Limiting factors that only effect population as it gets larger
    • Ex: Space
  8. Density Ind├ępendant Factors
    • Include drought, early frost, natural disaster
    • Change populations with out respect to number of individuals
  9. Life History strategies
    • All organisms have certain strategies to enable them to pass their DNA on
    • -How Often they breed
    • -How many offspring
    • -At one age can they reproduce
    • -At what age are they old/die
  10. K Selected Species
    • Produce few large well developed young
    • Often give parental care
    • Slow growth
    • Delayed maturation --> Delayed reproduction age
    • Long gestation
  11. R Selected Species
    • Lots of offspring at once
    • No or little parental care
    • Fast growth
    • Young able to reproduce relatively soon after birth
    • Short gestation
  12. Demography
    • Refers to the study of vital statistics of society/ population
    • Age/ gender structures can be used to predict many years down the road

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