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Limiting Factors

Population and Limiting Factors

Factors that cause a population to decrease are called Limiting factors
Examples of limiting factors food, space, weather, human activity, predation
Density dependent limiting factors factors that limit the growth of a population due to the size of the population
Density independent limiting factors factors that limit the growth of a population but are not due to the size of the population (outside forces)
Carrying Capacity The maximum population that an area can support with its resources.
Logistic growth ( S Curve) growth that occurs when there are limiting factors
Exponential growth (J Curve) Growth that occurs when a population increases and the growth rate increases. (No limiting factors).
Immigration (I = into) new members moving into a population
Emigration (E =exit) members moving out of a population
How do you find population change? (Births - Deaths) + (Immigrants - Emigrants) = Population Change
Examples of density dependent factors. Lack of food, predation, competition, disease.
Examples of density independent factors. Forest fire, hurricane, drought, human activity.
What will happen to the predator and prey population when there is a drought? It will go down, due to less food.
Describe several ways that prey can avoid being caught by predators. Camouflage, running, hiding, spraying.
What type of growth occurs when there is a J curve on a graph? Exponential growth.
What type of growth occurs when there is an S curve on a graph? Logistic growth.
What keeps a population near its carrying capacity? Limiting factors.
In a field, 20 rabbits are born and 8 rabbits die. During this time, there are 15 rabbits that migrate into the area and 5 rabbits that move out of the area. What is the population change? (B-D) + (I - E) = PC (20 - 8) + (15 - 5) = 12 + 10 = 22 rabbits
Created by: cook2sm



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