Please enable JavaScript.
Coggle requires JavaScript to display documents.
Factors that Influence Population Size - Coggle Diagram
Factors that Influence Population Size
Size
Immigration
increase population size
arrival of new residents that previously belonged to another population
Emigration
decrease population size
the departure of individuals who take up permanent residence elsewhere
Density
number of individuals in a given area
Distribution
location of individuals relative to one another
Limits on Population Growth
Density-Dependent Factors
causes birth rate to slow and death rates to rise
predation, parasitism, disease, and competition
Logistic growth
occurs when density-dependent factors affect population size over time
Density-Independent Factors
natural disasters or weather-related events affect population size
K selection
occurs when a population is near its environment's carrying capacity
R selection
occurs when population density is low and resources are abundant