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Population size - Coggle Diagram
Population size
Decrease
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Density-dependent factors: crowding increasing causes birth rate to decrease and death rate to increase so population size decreases.
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Fertility
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Replacement fertility rate: the number of offspring a woman should have to replace herself with a daughter
Logistic growth: population growth starts to slow down as the population size reaches the environment's carrying capacity
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Zero population growth: the number of births is equal to the number of deaths. Population size does not increase or decrease
Per capita growth rate: the number of births minus the number of deaths. Must remain constant and greater than zero for exponential growth to occur