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3 Cards in this Set
- Front
- Back
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Population size = (N+I) - (M+E) |
Natality: Increase to population size through births Immigration: Increase to population size from external populations Mortality: Decrease via death (predation/senescence) Emigration: Decrease via loss to external populations |
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Sigmoid population growth curve 1. Exponential phase 2. Transitional phase 3. Plateau phase |
1. Rapid increase in pop size - abundant resources 2. Natality falls/mortality rises - greater competition for resources = slower rate of pop increase until carrying capacity reached 3. CC reached, resources limited, predation/disease keep pop size balanced |
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Factors affecting population increase |
Affecting Availability of resources/shelter Predation/Disease Not affecting Climate/weather conditions Natural disasters |
