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

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Presentation transcript:

POPULATION DYNAMICS

Habitat: Set Source: Cunningham/Saigo, Environmental Science, 1999.

POPULATION DYNAMICS

How do populations change over time? Number of births Number of deaths b = no. b/1000/yearR.N.I. = b - d 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 = = 0.1 or 10%

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

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.

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

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