Biology Chapter 5 Flashcards
What is a population
A group of species in the same place at the same time
What is population defined by?
geographic distribution
population density
population size
What are the different geographic distributions
random, clustered, uniform
Define population density
individuals per unit of area
Population size
Total amount of individuals in the population
population model
A theoretical example of a population showing many of the main important factors
Population Growth
How quickly the population is growing
-Its determined by deaths, births, immigration, and emigration
Immigration versus emigration
Immigration is moving in, emigration is moving out
What are the different types of population growth
Logistic and exponential
Why does logistic growth flatten out?
When the population reaches is carrying capacity
carrying capacity
Total amount of organisms and ecosystem can support
How is population growth limited
INCREASE: Deaths, Emigration
DECREASE: Births, Imigration
Limiting factors
Factors that cause a population to be unable to grow, or kill off the individuals in the population
Density dependent factors
Limiting factors dependent on a population size
-predation, competition, parasitism, disease
Density Independent factors
Limiting factors that affect population no matter what
-natural disasters, weather, seasonal changes, human activity