Ecology 2 - 1 Questions for today 1. What is a population?...

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2 Questions for today 1. What is a population? 2. How do we determine population numbers (N)? 3. Can we predict changes in N? 1. Catch, mark, release on day 1 2. ASSUME: a. No births, deaths, migration b. Complete spatial mixing 3. Proportion marked in population equals proportion marks caught on day 2 4. So – catch, record marks, release on day 2 Lincoln Index
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3 # caught marked day 2 total caught day 2 = # marks in population total population size 20 100 100 N = N = ( 100 * 100 ) / 20 = 500 S.mormonia male population size Year 84 85 86 87 88 89 90 # males / 6.3 ha 0 500 1000 1500 2000 2500 3000 3500 Assume: constant per capita rate of population growth time N X X X X X X X X X X X XX X X
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4 Assume: constant per capita rate of population growth time N X X X X X X X X X X X XX X X S.mormonia male population size Year 84 85 86 87 88 89 90 # males / 6.3 ha 0 500 1000 1500 2000 2500 3000 3500 Exponential population growth: Number of individuals added over some time unit = constant x N dN/dt = rN r = intrinsic rate of increase or Malthusian parameter r = births/N – deaths/N r 0 Birth rate Death rate
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5 dN/dt = rN N t = N 0 e
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Ecology 2 - 1 Questions for today 1. What is a population?...

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