Population Ecology: Population Growth (AQA A-Level Geography): Flashcards
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10 cards from this deck
Biotic potential definition
Biotic potential definition
Max rate a population could grow under ideal conditions
Environmental resistance definition
Environmental resistance definition
Mortality rates from environmental factors preventing survival
Density independent factors
Density independent factors
Affect death rates regardless of population size/density
Density dependent factors
Density dependent factors
More significant as population size & density increase
Lag phase characteristic
Lag phase characteristic
Initial period of slow growth
Logarithmic phase characteristic
Logarithmic phase characteristic
Rapid population growth occurs
Stable phase characteristic
Stable phase characteristic
Population growth levels off; birth & death rates equal
Earth's population in 1800
Earth's population in 1800
Approximately 1 billion
Earth's population in 2020
Earth's population in 2020
Approximately 7.8 billion
Main driver of human population growth since 1800
Main driver of human population growth since 1800
Declining death rates (not increasing birth rates)