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Section 4.1 Summary – pages 91-99

Population Growth. Section 4.1 Summary – pages 91-99. Population: group of organisms, all of the same species, that live in a specific area. A healthy population will grow and die at a steady rate unless it runs out of food or space, or is attacked in some way by disease or predators.

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Section 4.1 Summary – pages 91-99

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  1. Population Growth Section 4.1 Summary – pages 91-99 • Population: group of organisms, all of the same species, that live in a specific area. • A healthy population will grow and die at a steady rate unless it runs out of food or space, or is attacked in some way by disease or predators.

  2. How fast do populations grow? Section 4.1 Summary – pages 91-99 • not linear growth. • graph of a growing population starts out slowly, then begins to resemble a J-shaped curve. Population Growth of Houseflies

  3. initial growth is slow because the number of reproducing individuals is small. Section 4.1 Summary – pages 91-99 • Soon, growth rate increases because number of individuals that reproducing has increased.

  4. growth unlimited Section 4.1 Summary – pages 91-99 • J-shaped growth curve illustrates exponential population growth. • Exponential growth: as a population gets larger, it also grows faster. • results in unchecked growth.

  5. What can limit growth? Section 4.1 Summary – pages 91-99 • Limiting factors: • food, disease, predators, space…, • cause population growth to slow. • population stabilizes as S-shaped growth curve. • Think Pair Share: what do the blue arrows represent?

  6. Carrying capacity Section 4.1 Summary – pages 91-99 • carrying capacity: The number of organisms of one species that an environment can support. • When a population overshoots carrying capacity, limiting factors control or stop population growth. Click image to view movie.

  7. Carrying capacity Section 4.1 Summary – pages 91-99 • If Deaths exceed births, the population drops. Carrying capacity

  8. Rapid life-history patterns Section 4.1 Summary – pages 91-99 • common in organisms from changeable or unpredictable environments. • have small body size, mature rapidly, reproduce early, and have a short life span. • Think Pair share: Come up with rapid life-history organisms.

  9. Slow life-history patterns Section 4.1 Summary – pages 91-99 • Large species, live in more stable environments. • Think Pair Share: Come up with examples of slow life-history organisms.

  10. Density factors and population growth Section 4.1 Summary – pages 91-99 • How organisms are dispersed can be important. • Three dispersal patterns: random, clumped, & uniform. Clumped Uniform Random

  11. Density factors and population growth Section 4.1 Summary – pages 91-99 • 2 kinds limiting factors related to dispersal: • density-dependent factors • density-independent factors. • Density-dependent factors:disease, competition, predators, parasites, and food. Depend on population density. • Density-independent factors:temperature, weather, drought, major habitat disruption. Independent of population density.

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