3 - POPULATION DYNAMICS READINGS: FREEMAN, 2005 Chapter 52...

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POPULATION DYNAMICS READINGS: FREEMAN, 2005 Chapter 52 Pages 1196-1213
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MATURNITY TABLE AND REPRODUCTIVE OUTPUT Fecundity is the number of female offspring produced by each female in a population. A maternity table combines survivorship (l X ) with age specific fecundity (m X ) . • Net reproductive output, ∑ (l X m X ), provides a way of projecting population changes each generation.
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A SIMPLE MATURNITY TABLE X l x m x l x m x 0-1 1.00 0 1-2 0.50 1 2-3 0.30 1 3-4 0.20 1 4-5 0.10 0 5 0 m x = 3
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A SIMPLE MATURNITY TABLE X l x m x l x m x 0-1 1.00 0 0 1-2 0.50 1 0.50 2-3 0.30 1 0.30 3-4 0.20 1 0.20 4-5 0.10 0 0 5 0 m x = 3
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A SIMPLE MATURNITY TABLE X l x m x l x m x 0-1 1.00 0 0 1-2 0.50 1 0.50 2-3 0.30 1 0.30 3-4 0.20 1 0.20 4-5 0.10 0 0 5 0 m x = 3 R o = 1.00
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R O AND POPULATION DYNAMICS The following rules can be used to determine if a population is stationary, increasing or decreasing. The rules are: If R o = 1, then population is stationary. If R o > 1, then population is growing. If R o < 1, then population is declining.
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DISTRIBUTION OF BIRTHS AND REPRODUCTIVE OUTPUT In populations that have similar age specific survivorship curves: • First births at early ages increase R o . • First births at late ages decrease R o . Delaying births in a growing population will slow the rate of growth.
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Population A: A Stationary Population X l x m x l x m x 0-1 1.00 0 0 1-2 0.50 1 0.50 2-3 0.30 1 0.30 3-4 0.20 1 0.20 4-5 0.10 0 0 5 0 m x = 3 R o = 1.00
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Population B : A Growing Population X l x m x l x m x 0-1 1.00 0 0 1-2 0.50 3 1.50 2-3 0.30 0 0 3-4 0.20 0 0 4-5 0.10 0 0 5 0 m x = 3 R o = 1.50
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3 - POPULATION DYNAMICS READINGS: FREEMAN, 2005 Chapter 52...

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