Biology SL chapter 5.3 (Populations)

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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
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Phases of population growth curve
1. exponential phase . 2.Transitional phase. 2. plateau phase.
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Exponential phase
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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Other cards in this set

Card 2

Front

Phases of population growth curve

Back

1. exponential phase . 2.Transitional phase. 2. plateau phase.

Card 3

Front

Exponential phase

Back

Preview of the front of card 3

Card 4

Front

Transitional phase

Back

Preview of the front of card 4

Card 5

Front

Plateau phase

Back

Preview of the front of card 5
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