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Limiting Factors
Population and Limiting Factors
Question | Answer |
---|---|
Environmental factors that prevent a continuous growth of a population | 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 |