Lecture 19

Lecture 19 - Bio 121 Lecture 19 Patterns of population...

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Bio 121 Lecture 19 – Patterns of population growth A. Why Study population growth? a. Can predict future growth trends b. Assess status of population c. Rate of growth may in indicator of ecological conditions d. Useful in studying interactions between populations between biotic and abiotic environments B. Exponential growth (no environmental constraints) – depends on number of individuals a. Discrete – growth in particular time units a.i. Doubling $0.01 payment per day (N = 0.01X2^t) a.ii. Formula: N = NoRo^t a.ii.1. N = population size in future a.ii.2. Ro = net reproductive rate (number of females produced/number of females currently) a.ii.3. No = initial population size a.ii.4. t = number of time periods a.iii. Moth population (population sizes in 2 or 5 years) a.iii.1. Ro = 1.9 a.iii.2. No = 600 a.iii.3. 2 N=(600)(1.9)^2 a.iii.4. 5 N=(600)(1.9)^5 b. Continuous – when an organism breeds repeatedly and at any times (overlapping generations) b.i. Formula: ∆N/∆T = rN
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Lecture 19 - Bio 121 Lecture 19 Patterns of population...

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