Population Clock

The Water Lily Story The Anchor Bay High School pond has one water lily leaf floating on the surface. The lily population will double in size every day if left unchecked. The water lilies will smother the pond in 30 days, effectively killing all other living things in the water. At what point should you concern yourself with cutting back the lily plants? When the pond is 1/8th covered, one-fourth covered, or one-half covered?

. Lily Pond – Day 1. Lily Count: 1

. Lily Pond – Day 2. Lily Count: 2

. Lily Pond – Day 3. Lily Count: 4

. Lily Pond – Day 4. Lily Count: 8

. Lily Pond – Day 5. Lily Count: 16

. Lily Pond – Day 6. Lily Count: 32

. Lily Pond – Day 7. Lily Count: 64

. Lily Pond – Day 8. Lily Count: 128

. Lily Pond – Day 9. Lily Count: 256

. Lily Pond – Day 10. Lily Count: 512

. Lily Pond – Day 11. Lily Count: 1,024

. Lily Pond – Day 12. Lily Count: 2,048

. Lily Pond – Day 13. Lily Count: 4,096

. Lily Pond – Day 14. Lily Count: 8,192

. Lily Pond – Day 15. Lily Count: 16,384

. Lily Pond – Day 16. Lily Count: 32,768

. Lily Pond – Day 17. Lily Count: 65,536

. Lily Pond – Day 18. Lily Count: 131,072

. Lily Pond – Day 19 Lily Count: 262, % covered

Lily Pond – Day 20 Lily Count: 524, % covered

Lily Pond – Day 21 Lily Count: 1,048, % covered

Lily Pond – Day 22 Lily Count: 2,097, % covered

Lily Pond – Day 23 Lily Count: 4,194, % covered

Lily Pond – Day 24 Lily Count: 8,388, % covered

Lily Pond – Day 25 Lily Count: 16,777, % covered

Lily Pond – Day 26 Lily Count: 33,554,432 Pond is 1/16 th covered

Lily Pond – Day 27 Lily Count: 67,108,864 Pond is 1/8 th covered

Lily Pond – Day 28 Lily Count: 134,217,728 Pond is 1/4 th covered

Lily Pond – Day 29 Lily Count: 268,435,456 Pond is 1/2 covered

Lily Pond – Day 30 Lily Count: 536,870,912 Pond is completely covered

Characteristics of Populations Geographic Distribution Density Growth rate Age structure Area inhabited by a population The # of individuals per unit area Rate at which a population changes size Different ages of the organisms in a population

Population Density The number of individuals per unit area

Population Density Cactus: small #’s Low density Shrubs: higher #’s High density

Population Growth Factors that affect population size: Birth Rate Birth Rate Death Rate Death Rate Immigration Immigration Emigration Emigration the amount of births the amount of births the amount of deaths the amount of deaths moving into an area moving into an area moving out of an area moving out of an area

How is the Population Affected? Increase or Decrease  birth rate &  death rate  birth rate &  death rate  birth rate &  death rate  birth rate &  death rate  immigrants &  emigrants  immigrants &  emigrants  immigrants &  emigrants  immigrants &  emigrants Decrease Decrease Increase Increase Decrease Decrease Increase Increase

Exponential Growth Will occur under IDEAL conditions Will occur under IDEAL conditions 1. unlimited resources 2. no predators 3. no disease 4. plenty of space Produces a J – shaped Curve Produces a J – shaped Curve

Logistic Curve S- Curve In ecosystems: In ecosystems: Resources are limitedResources are limited PredatorsPredators DiseaseDisease The growth of populations slows or stops (actually averages out to a steady size) The growth of populations slows or stops (actually averages out to a steady size) Birth rate = death rateBirth rate = death rate Immigration = emigrationImmigration = emigration Leveled-off population reached its carrying capacity Leveled-off population reached its carrying capacity

Carrying Capacity The largest number of organisms that a given ecosystem can support

Logistic Curve S-Curve

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