term1 Definition1term2 Definition2term3 Definition3
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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
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
Factors affecting population increase
Affecting
Availability of resources/shelter
Predation/Disease
Not affecting
Climate/weather conditions
Natural disasters
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