Popeco

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  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
  • Although several species may share a habitat they each have their own niche. A niche is a very narrow range where a species fits within a habitat.
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  • Popeco

    1. 1. Population Dynamics SOL BIO 9a
    2. 2. BIO SOL: 9a The student will investigate and understand dynamic equilibria within populations, communities, and ecosystems. Key concepts include: • interactions within and among populations including carrying capacities, limiting factors, and growth curves;
    3. 3. Population Dynamics Population: all the individuals of a species that live together in an area Demography: the statistical study of populations, make predictions about how a population will change
    4. 4. Population Dynamics Three Key Features of Populations •Size •Density •Dispersion • (clumped, even/uniform, random)
    5. 5. Three Key Features of Populations 1. Size: number of individuals in an area
    6. 6. 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). Three Key Features of Populations
    7. 7. PRE- REPRODUCTIVE REPRODUCTIVE POST- REPRODUCTIVE
    8. 8. Population of a Stable Country
    9. 9. You decide!
    10. 10. Three Key Features of Populations 2. Density: measurement of population per unit area or unit volume Formula: Dp= N Pop. Density = # of individuals ÷ unit of space S
    11. 11. 1. Immigration- movement of individuals into a population 2. Emigration- movement of individuals out of a population 4 Factors that affect density
    12. 12. 4 Factors that affect density 3. Density-dependent factors- Biotic factors in the environment that have an increasing effect as population size increases Ex. disease competition parasites
    13. 13. 4. Density-independent factors- Abiotic factors in the environment that affect populations regardless of their density Ex. temperature storms habitat destruction drought 4 Factors that affect density
    14. 14. Immigration Emigration Natality MortalityPopulation + + - - Factors That Affect Future Population Growth
    15. 15. Three Key Features of Populations 3. Dispersion:describes their spacing relative to each other • clumped • even or uniform • random
    16. 16. clumped even (uniform) random
    17. 17. Population Dispersion
    18. 18. Other factors that affect population growth Limiting factor- any biotic or abiotic factor that restricts the existence of organisms in a specific environment.  EX.- Amount of water Amount of food Temperature
    19. 19. Many organisms present Few organisms present Few organisms present None None Limiting Factor- Zone of Tolerance
    20. 20. Carrying Capacity- the maximum population size that can be supported by the available resources There can only be as many organisms as the environmental resources can support Other factors that affect population growth
    21. 21. Carrying Capacity Carrying Capacity (k) N u m b e r Time J-shaped curve (exponential growth) S-shaped curve (logistic growth)
    22. 22. 2 Life History Patterns 1. R Strategists  short life span  small body size  reproduce quickly  have many young  little parental care  Ex: cockroaches, weeds, bacteria
    23. 23. 2 Life History Patterns 2. K Strategists  long life span  large body size  reproduce slowly  have few young  provides parental care  Ex: humans, elephants
    24. 24. Human Population Growth
    25. 25. Human Population Growth
    26. 26. Time unit Births Deaths Natural increase Year 130,013,274 56,130,242 73,883,032 Month 10,834,440 4,677,520 6,156,919 Day 356,201 153,781 202,419 Hour 14,842 6,408 8,434 Minute 247 107 141 Second 4.1 1.8 2.3

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