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Chapter 5 Populations

Chapter 5 Populations. Section 5-2 Limits To Growth. Limiting Factors. Cause Population Growth to DECREASE! Competition Predation Parasitism & Disease Climate Extremes Human Disturbances. Density Dependent Factors : differ with the biome/environment Amount food Disease Competition

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Chapter 5 Populations

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  1. Chapter 5Populations Section 5-2 Limits To Growth

  2. Limiting Factors • Cause Population Growth to DECREASE! • Competition • Predation • Parasitism & Disease • Climate Extremes • Human Disturbances

  3. Density Dependent Factors: • differ with the biome/environment • Amount food • Disease • Competition • Parasites • Versus Independent: • Abiotic factors • Habitat disruption

  4. Density-Dependent Factors Are Limiting Factors that depend on increased population size (density) for activation. competition predation parasitism disease

  5. Competition Between different species is a major force behind evolutionary change Results in the formation ofNICHES

  6. Competition

  7. Predation • Predator/Prey Relationship • Balances, Stabilizes Populations • Wolves & Moose • 50 kg Wolf needs 2700 kg Moose per year • Average Moose is 385 kg • How many Moose need to be eaten each year?

  8. Predation • 2700/385 = 7.01 Moose per Year • A pack of 8 wolves will kill how many Moose per year?

  9. Parasitism & Disease Weaken Host Makes Host Susceptible To Predation May Kill Host.

  10. Density-Independent Factors • Affect population regardless of size. • Unusual Weather • Natural Disasters • Seasonal Cycles • Human Activities • Dams • Clear Cutting

  11. Density-Independent Factors Result in crash in population size May result in extinction

  12. What sort of limiting factor is seen here?

  13. Density dependent!

  14. What sort of limiting factor is seen here?

  15. Density independent

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