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Published byRegina Daniels Modified over 8 years ago
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Mrs. Sandy Gómez
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Is the change in a population over time, and can be quantified as the change in the number of individuals of any species in a population. In biology, the term population growth is likely to refer to any known organism (plant, animal, bacteria, protist, fungi)
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Exponential Growth Logistic Growth
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Takes place when a population of organisms live in an ideal environment: More than enough food, shelter, water, mates, etc. When organims are new to an environment and have no immediate predators When a population´s numbers have been drastically reduced by a catastrophic event Under this conditions populations increase fast.
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Population growth is only limited by their physiological condictions:
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Shape of the typical Exponential Growth Graph has a J-shaped curve
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Does this graph show exponential growth? Whooping Crane
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The exponential growth model assumes unlimited resources, which is never the case in the real world. No population can grow indefinitely forever. Why?
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Organisms need resources to keep alive. If a population increases, also will the demand of resources and they will get very crowded.
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There is a limit to the number of individuals that can occupy a habitat. That is the carrying capacity of the ecosystem Which is the maximum population size that a particular environment can support at a particular time with no degradation of the habitat.
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When populations exceed carrying capacities, this happens: organisms start fighting for resources to accomplish survival others die of starvation, by the attack of predators By the end, population growth stabilizes
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Shape of the typical Logostic Growth Graph has an S-shaped curve
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Do these graphs show a Logistic Growth?
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