Module 3.4 — Matrix Models & Age-Structured Growth

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Last updated 4:19 AM on 6/8/26
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13 Terms

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Matrix Model
Population model that incorporates age-specific survival and fecundity
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When to Use Matrix Models
When survival and reproduction differ among age classes
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Population Vector
Column containing the number of individuals in each age class
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Demographic Rates
Survival and fecundity values used in a matrix
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Matrix Top Row
Fecundity values (bx)
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Matrix Diagonal
Survival values (sx)
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Age-Structured Population
Population where different age classes contribute differently to growth
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Why Humans Need Matrix Models
Survival and reproduction vary greatly with age
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Fluctuating Age Structure
Uneven age distributions caused by past changes in births or deaths
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Large Age Cohort
Indicates high birth rates or low death rates in the past
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Generation Time (T)
Average age at which offspring are produced
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Generation Time Equation
T = Σ(xlxbx)/Σ(lxbx)
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Population Growth Estimate from Life Tables
λ = R₀^(1/T)