Bio Chapter 5 Quiz Flashcards
The number of individuals that can be found per unit area
Population Density
Individuals moving into a populations range from elsewhere
Immigration
Individuals moving out of a populations range
Emigration
Under ideal conditions with unlimited resources, a population will increase exponentially
Exponential Growth
When natural populations don’t grow exponentially for long — sooner or later something stops it
Logistic Growth
When the birth rate and the death rate are the same
Carrying capacity
The way individuals are spaced out across their range
Population distribution
The 5 characteristics used to describe a population
Geographic range
Growth rate
Density
Distribution
Age structure
4 things that affect population growth
Birth Rate
Death Rate
Immigration
Emigration
What is different about exponential and logistic growth? (Compare and contrast)
Exponential growth is more drastic, the population increases a lot in a shorter amount of time in ideal conditions. Logistic growth is a lot slower and eventually levels off, the environment usually will contain more limiting factors.
Anything that causes the rate of population growth to decrease such as things like a decrease in food or an increase in predators
Limiting Factor
What are the two types of limiting factors?
Density dependent and density independent
A limiting factor that depends on the size of a population
Density dependent
A limiting factor that affects all populations in similar ways regardless of their size
Density independent
Compare and contrast density dependent and density independent. Give examples
Density dependent depends on the size of a population and that size determines the effect of the factor. Examples include competition, predation, parasitism, and diseases. Density independent doesn’t depend on the size of a population, regardless of the size it will be effected. Examples include unusual weather, seasonal cycles, and human activities.
