APES formulas quiz

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11 Terms

1
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Population Density

Population/Area

2
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Rule of 70

70 / percent growth rate

3
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Population growth rate as a percentage

births - deaths / number of people * 100

4
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Rate of Change

final - initial / final time - initial time

5
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Percent change

Final - initial / initial * 100

6
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Net Primary Productivity (NPP)

Gross Primary Productivity (GPP) - Respiration

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Gross Primary Productivity

GPP = Rate of photosynthesis by plants

or

GPP = total solar energy captured by plants - energy lost due to respiration by plants

8
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Fuel Efficiency

Distance traveled / Unit of Fuel consumed

9
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10% rule

roughly 10% of energy transfers from trophic levels in a food chain, with the rest being lost as heat

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Half Life

natural log (ln) * (2) / decay constant

11
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LD50

Dose / Weight