Outline the factors affecting population size (NIME)
Natality: increase to population size through reproduction. Immigration: Increase to pop size from external populations.Mortality: decrease in pop size due to death.Emigration: decrease in pop size as result of loss to external pops
Rapid increase in population size as natality rate exceeds mortality rate. caused by abundance of resources (food, shelter, water) and limited environmental resistance (disease and predation uncommon)
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Transitional phase
As the population continues to grow, competition increases as resource availability is reduced. Natality starts to fall as mortality rises, results in slower population increase
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Plateau phase
Eventually mortality and natality rate become equal. Population has reached carrying capacity (K) of environment, limited resources, predation and disease keep pop balanced.
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Factors affecting population growth (affected by population density) (PANDA)
Predation and parasites, Availability of water and shelter, Nutrient supply (food source), Disease, Accumulation of wastes
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Factors affecting population growth (unaffected by population density) (CAN)
Climate and weather conditions, Availability of light, O2 and CO2, Natural disasters
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