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Lecture 18

BIO SCI 94 Lecture Notes - Lecture 18: Logistic Function, Exponential Growth, Metapopulation

Biological Sciences
Course Code
Nancy Burley

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Population: group of individuals of one species that live in the same area at the same time
Population ecology: study of how and why the number of individuals in population
changes over time
A species’ range is its geographic distribution
Influenced by biotic and abiotic factors
Dynamic: always changing
Population density: ## / unit area
Density varies over range
Demography: study of factors that determine the population size/structure over time
Birth, death, immigration, emigration
Life table: summary of probability that females survives and reproduces over any interval
of time
Used to describe and predict population dynamics
Age class (x): group of individuals of a specific age
Number of survivors in each age class (Nx)
Survivorship (lx): proportion of offspring (female individuals) produced
that survive to a particular age
Age-specific fecundity (mx): average # of daughters produced by a female
in each class
Average # birth/year/female: (lx)(mx)
Why do we focus on females than males? Because the number of males in a
population has less influence on population dynamics
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