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Population decline

Population Biology

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Population Biology Population Dynamics Principles of Population Growth Exponential growth: as a population gets larger, it also grows at a faster rate (makes a J-shaped curve on a graph) A population cannot grow indefinitely; eventually, factors such as lack of food, disease, etc. will slow population growth (makes an S-shaped curve on a graph) Carrying capacity: the number of organisms of one species that an environment can support indefinitely When a population overshoots the carrying capacity, limiting factors may come into effect Reproduction Patterns Populations are always naturally fluctuating Life-history pattern: an organism?s reproductive pattern Rapid life-history patterns are common among organisms from changeable or unpredictable environments

Population Pyramid Examples

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Population Pyramids = graphic device that represents a population?s age and sex composition. Pyramid describes diagram?s shape for many countries in 1800?s when was created. A broad base of younger age groups and progressively narrowing to apex as older Populations were thinned by death. Now there are many different shapes. Quickly growing population of Kenya ? jas ,most people in lowest age cohorts Percentage in older age groups declines successively with markedly sloping sides. Typically female life expectancy is decreased in older cohorts of less developed countries ? 50 for Kenya ? proportion of females in older age groups is less than in Sweden or U.S.

over population

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Overpopulation: The World's Problem by Vince Busam English 12 Period 2 Bradburn 11 December, 1995 The world's population will soon reach a level where there will not be enough resources to sustain life as we know it. Growth must be checked to avoid this catastrophe. Many environmental, social, and economic problems either stem from or are increased in magnitude by the overpopulation problem. With an exponentially increasing population, the problems created by overpopulation grow correspondingly. To ensure population stability not only in the increasingly wealthy third-world areas, but also in the industrialized areas, countries and individuals must work together to achieve zero population growth.
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