Population Pulse Anchor Chart
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DATE:
Grade 9 Science • Ecology
Population Pulse
Factors affecting how populations grow and shrink
Birth Rate
Number of births in a specific time.
+ INCREASES SIZE
Immigration
Moving into a population.
+ INCREASES SIZE
Death Rate
Number of deaths in a specific time.
- DECREASES SIZE
Emigration
Moving out of a population.
- DECREASES SIZE
The Life Equation
(B + I) Inflow
-
(D + E) Outflow
=
Δ Population
If (B+I) > (D+E), population GROWTH occurs.
If (B+I) < (D+E), population DECLINE occurs.
Case Study Notes
Visual Reference Chart v1.2
Ecology Unit 2: Ecosystem Dynamics