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Chapter 54: Population Ecology (Lecture Notes)

Biological Sciences
Course Code
Kamini Persaud

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Chapter 54: Population Ecology
Mar 29/2011
How do ecologists study populations?
Population: all the individuals of a species in an area
Population structure: age distribution of individuals, and how they spread over
the environment
Density influences how individuals interact
Demographic events: births, deaths, emigration, immigration,
These events create population dynamicsstudy of demography
Tracking individuals:
Individuals are often tagged and marked marking recapture method
Tracking devicescomputer chips that are embedded in an animal for real
time results (heartbeat, temperature, etc.)
Molecular markersreflect the latitude and longitude of migrated areas,
hydrogen levels, etc.
Measuring Population Density:
Counting every individual in a population is often not possible
Statistical methods estimate population from a sample
1.Capture, Mark, Recapture
2.Life Tablea cohort (group of the same individuals) is selected, and
examined over a time period, comparing survival rate, and mortality rate
Predicts future trends
3.Survivorship curvesplotted data that shows the relationship in relation
to age
High survivorship whole life
Gradual decline
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