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Lecture 41

BIOL 1001 Lecture Notes - Lecture 41: Generation Time, Coevolution


Department
Biology
Course Code
BIOL 1001
Professor
Tamara Kelly
Lecture
41

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March 24th Lecture Note BIO
Population Regulation: Density-Dependent & -Independent Factors
Logisti odel pedits stale populatio size at K, ut ofte ad luk eets
Logistic model is more realistic, but does respond to the fact that individuals immediately
respond to a factor
Combination of independent & dependent factors acting on population
Density dependent influences may make individuals more vulnerable to density-independent
factors
Generation time, body size & potential population growth
Life-history trade-off: fecundity/survivorship vs parental care
K- selection (density-dependent selection)? Life history traits sensitive top population density
When N is close t Ok selection favours adaptations that highlight competition for scarce
resources (producing fee high uality offspig (K-selection))
When N<<K, selection favours adaptations that increase r, such as those that promote rapid &
numerous reproduction (r-selection)
Relating Life History to Population Growth Trends
Life-history tradeoffs: fecundity/survivorship vs parental care
K selection (density dependent selection) -> life history traits sensitive to population density
When N is close to K ,selection favours adaptations that highlights competition for scarce
resources (producing fewer, high-aulity offspig
When N<<K, selection favours adaptations that increase r, such as those that promote rapid &
numerous reproduction (r-selection)
R-selection -> life history traits maximize reproduction
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