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-Birth (Natality)
-Death (natural / due to predation) (Mortality)
-Resources for animals (food, water,
space for shelter & reproduction)
-Resources for plants (space, sunlight, water, mineral nutrients)
-Migration (Immigration / Emigration)
A factor that directly relates to the competition between individuals for food, water and shelter
These factors amount to what is known as the carrying capacity of the habitat
The study of population sizes and ages as a dynamic (constantly changing) system, and the environmental and biological factors that drive them.
A factor that will have a similar
effect regardless of population size or habitat capacity
-P = subsequent (new/following) year’s population
-P0 = previous year’s population
-r = population growth rate, encompassing
-R+ = births & immigration
-R- = deaths and emigration
-K = carrying capacity of habitat