Chapter 5 Populations.

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Presentation transcript:

Chapter 5 Populations

Factors Affecting Population Growth Birthrate (+) Death rate (-) Immigration (+) Emigration (-)

Exponential Growth The size of each generation of offspring will be larger than the one before it The larger the population gets, the faster it grows

Logistic Growth Is when a population’s growth slows and then stops, after a period of exponential growth Growth stops when birthrate = death rate and immigration = emigration

Carrying Capacity Is the maximum number of individuals of a particular species that a particular environment can support

Limits A limiting factor controls the growth of a population Examples – competition, predation, parasitism, disease, unusual weather, natural disaster These determine carrying capacity

Human Population Slow growth early Civilization advancements increased growth Bubonic plague caused a decrease Industrial Revolution led to exponential growth

Current world population over 7 billion US Census taken 2010

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