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Population Fluctuation Notes

Population Fluctuation Notes. Review Question 1:. What factors lead to exponential growth in populations?. Review Question 2:. What factors lead to logistic growth curves?. Check For Understanding . When the birthrate of a population exceeds its death rate, the population decreases.

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Population Fluctuation Notes

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  1. Population Fluctuation Notes

  2. Review Question 1: What factors lead to exponential growth in populations?

  3. Review Question 2: What factors lead to logistic growth curves?

  4. Check For Understanding • When the birthrate of a population exceeds its death rate, the population • decreases. • increases. • stays the same. • increases then decreases.

  5. Check for Understanding • An S-shaped curve on a graph of population growth is characteristic of • exponential growth. • logistic growth. • carrying capacity. • delayed growth.

  6. Check for understanding • Exponential growth in a population slows down or stops as • resources become limited. • rate of immigration increases. • rate of emigration decreases. • birth rate increases.

  7. Population Fluctuation Notes • Limits to Population Growth: A. A limiting factor is a factor that causes population growth to decrease.

  8. Population Fluctuation Notes • Limits to Population Growth: A limiting factor is a factor that causes population growth to decrease. a. Density Dependent Factors are limiting factors that depend upon the population size. Examples include: • Competition • Predation • Parasitism • Disease

  9. Population Fluctuation Notes b. Density Independent Factors are limiting factors that do not depend upon a population’s size. Examples include: • Natural Disasters • Seasonal Variation • Human activities such as deforestation

  10. Check for Understanding • A limiting factor that affects all populations in similar ways regardless of their size might be • drought. • disease. • predation. • crowding.

  11. Check for Understanding • Within a limited area, if the population of a predator increases, the population of its prey is likely to • increase. • decrease. • remain about the same. • become extinct.

  12. Check for Understanding • Which of the following is a density-independent factor affecting populations? • predation • disease • a destructive hurricane • parasites

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