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POPULATION DYNAMICS

POPULATION DYNAMICS. Habitat: Set. 99. 87. 75. 60. 30. 1800. Source: Cunningham/Saigo, Environmental Science , 1999. POPULATION DYNAMICS. POPULATION DYNAMICS. b = no. b/1000/year. R.N.I. = b - d. How do populations change over time?. Number of births Number of deaths.

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POPULATION DYNAMICS

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  1. POPULATION DYNAMICS

  2. Habitat: Set 99 87 75 60 30 1800 Source: Cunningham/Saigo, Environmental Science, 1999.

  3. POPULATION DYNAMICS

  4. POPULATION DYNAMICS

  5. b = no. b/1000/year R.N.I. = b - d How do populations change over time? • Number of births • Number of deaths • Growth rate r • R.N.I. • e.g. pop. = 10,000 • b = 2,000/yr (or 200/1,000) • d = 1,000/yr (or 100/1,000) •  r = 0.2 - 0.1 = 0.1 or 10%

  6. Doubling Time • Amount of time it would take for a population to double • in size assuming a constant r • Td = 0.7 • r • Immigration: individuals entering a population • Emigration: individuals leaving a population • e.g. b = 1,000 • d = 500 • i = 10 • e = 100 r = (0.1 - 0.05) + (0.001 - 0.01) r = 0.05 - 0.009 = 0.041 Td = 0.7 = 17 years 0.041

  7. Geometric vs Linear Growth • Starting salary of $1 for first week that then doubles each week • Paid $10 per week with an increase in salary of $10 per week.

  8. Exponent is multiplied to the population Constant amount added to the population Source: Cunningham/Saigo, Environmental Science, 1999.

  9. Depends on no. of offspring, their average survival rate, and how early and often reproduction takes place. Source: Cunningham/Saigo, Environmental Science, 1999.

  10. Source: Cunningham/Saigo, Environmental Science, 1999.

  11. Source: Cunningham/Saigo, Environmental Science, 1999.

  12. Source: Cunningham/Saigo, Environmental Science, 1999.

  13. Source: Cunningham/Saigo, Environmental Science, 1999.

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