USU 1350

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Author:
Anonymous
ID:
25289
Filename:
USU 1350
Updated:
2010-06-30 01:40:19
Tags:
Populations
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Description:
Populations
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  1. Populations
    The unit of management in outside world
  2. Population
    a collection of individuals that are close enough geographically that they may find each other and reproduce
  3. Population ecology attempts to
    understand relationships between populations and their habitat
  4. Habitat
    • food, water, and cover
    • range of tolerance - dimensions
    • conspecifics - others of own species
    • other animals - predators, parasites
  5. Demographics
    • abundance
    • density
    • age structure
    • sex ratio
    • birth rate
    • death rate
    • immigration
    • emmigration
    • growth rate
  6. abundace
    raw numbers
  7. density
    numbers per area
  8. Age Structure
    the number of animals in each cohort
  9. Cohort
    age class
  10. Sex Ratio
    • number of males to females in population
    • males:females
    • can be combined with age structure
  11. Birth Rate
    • MAKES GROWTH FLUCTUATE
    • number of young born per female in population
    • can be combined with age structure
  12. Death Rate
    • number dying per individual in population
    • can be combined with age structure
  13. Immigration
    Number joining a population
  14. Emigration
    • number leaving a population
    • 200 leave/1000 = 20%
  15. Growth Rate
    • annual change in population
    • can be positive (growing)
    • can be negative (negative)
    • can be zero
  16. Growth Rate calculations
    (birth rates + immigration) - (deaths+emigration) / total population size from previous year
  17. Types of population growth
    • exponential
    • logistic
  18. exponential growth
    • growth is independent of population density
    • independent of resource availability
    • Not REALISTIC
  19. Logistic Growth
    • dependent on population size
    • dependent on resource availability
  20. Inflection point
    • exponential growth turns into logisitic growth
    • always same 1/2 K (carrying capacity)
  21. Carrrying Capacity
    the growth rate is zero
  22. Population quality is related to
    • population density
    • lower density equals higher quality
    • higher density equals lower quality
  23. Management Implications
    • 1.)cannot have highest density and quality at same time
    • 2.)focus on objective - quality or quantity
    • 3.)density always relative to resource abundance
    • 4.)resource abundance is low - must reduce population to help system recover

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